[cctalk] Vintage Computer Systems for sale

[Stephen Pereira via cctalk]

Good afternoon to all,

I am starting the process of selling off some of my vintage computer systems, 
so as to not burden anyone I leave behind.

The systems I list here are available for viewing in Bedford, NH, just west of 
Manchester, NH.  Anyone interested can send me an e-mail message and we can set 
up an appointment for you to visit.  Cash and Carry, of course, and reasonable 
offers will be considered.

Altair 8800c  —  $2500

I constructed this system early in 2019.  I built the front panel and front 
panel interface boards, and soldered up the backplane.  The rest of the boards 
were purchased assembled and tested.  You can see the Altair 8800c story here:  
https://deramp.com/altair.html  The system is fully tested and working, 
currently using virtual Altair disk drives via the Deramp application.  Plenty 
of documentation.

Single 8 inch disk drive in a dual drive cabinet  —  $500

This physical disk drive has been paired with the Altair 8800c in the past.  
Works fine.  I included will be an 8 inch disk drive that used to be in this 
cabinet until the power supply failed.  I believe this drive can be repaired.  
Included will be another 8 inch drive that is the wrong form factor to fit into 
the cabinet.  Purchased on eBay, untested.

Altair 680  —  $2000

I acquired this system on eBay back at the end of 2018.  It was not working, 
but a bit of troubleshooting discovered bad ram which was replaced.  The least 
significant LED of the address display does not light, but I’ve tested that the 
proper signals are there.  I simply did not want to risk changing out the LED.  
This system comes with the 4-slot riser, but the connectors are not yet 
soldered in.  No add-in boards.  Plenty of documentation.

Complete SWTPC 6800 clone system from Corsham Technologies  —  $400

I acquired this system from Bob at Corsham in the middle of 2018.  It is the 
complete setup, with the full 64K ram and the virtual disk drives.  
Documentation available at Corsham Technologies:  http://www.corshamtech.com 


Northstar Horizon  —  $800

I purchased this system on eBay as a running system.  From time to time I had 
problems with the top 8K ram on the Horizon 64K ram board.  The 64k ram board 
has been replaced with a Compupro Ram 17 (or clone), works great, no problems.  
I will include the glitchy Horizon 64K ram board.  FYI, a Deramp Virtual Sector 
Generator works great with this system, eliminating the need for hard sector 
diskettes.  https://deramp.com/vsg.html

Thanks for listening!

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

[cctalk] Re: Vintage Computer Systems for sale

[Stephen Pereira via cctalk]

Sorry Sellam, none of the websites I mentioned for information are mine.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

[cctalk] Vintage Computer Systems for sale

[Stephen Pereira via cctalk]

Good afternoon to all,

I am starting the process of selling off some of my vintage computer systems, 
so as to not burden anyone I leave behind.

The systems I list here are available for viewing in Bedford, NH, just west of 
Manchester, NH.  Anyone interested can send me an e-mail message and we can set 
up an appointment for you to visit.  Cash and Carry, of course, and reasonable 
offers will be considered.

Altair 8800c  —  $2500

I constructed this system early in 2019.  I built the front panel and front 
panel interface boards, and soldered up the backplane.  The rest of the boards 
were purchased assembled and tested.  You can see the Altair 8800c story here:  
https://deramp.com/altair.html  The system is fully tested and working, 
currently using virtual Altair disk drives via the Deramp application.  Plenty 
of documentation.

Single 8 inch disk drive in a dual drive cabinet  —  $500

This physical disk drive has been paired with the Altair 8800c in the past.  
Works fine.  I included will be an 8 inch disk drive that used to be in this 
cabinet until the power supply failed.  I believe this drive can be repaired.  
Included will be another 8 inch drive that is the wrong form factor to fit into 
the cabinet.  Purchased on eBay, untested.

Altair 680  —  $2000

I acquired this system on eBay back at the end of 2018.  It was not working, 
but a bit of troubleshooting discovered bad ram which was replaced.  The least 
significant LED of the address display does not light, but I’ve tested that the 
proper signals are there.  I simply did not want to risk changing out the LED.  
This system comes with the 4-slot riser, but the connectors are not yet 
soldered in.  No add-in boards.  Plenty of documentation.

Complete SWTPC 6800 clone system from Corsham Technologies  —  $400

I acquired this system from Bob at Corsham in the middle of 2018.  It is the 
complete setup, with the full 64K ram and the virtual disk drives.  
Documentation available at Corsham Technologies:  http://www.corshamtech.com 


Northstar Horizon  —  $800

I purchased this system on eBay as a running system.  From time to time I had 
problems with the top 8K ram on the Horizon 64K ram board.  The 64k ram board 
has been replaced with a Compupro Ram 17 (or clone), works great, no problems.  
I will include the glitchy Horizon 64K ram board.  FYI, a Deramp Virtual Sector 
Generator works great with this system, eliminating the need for hard sector 
diskettes.  https://deramp.com/vsg.html

Thanks for listening!

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

[cctalk] HP-86 system available

[Stephen Pereira via cctalk]

Good afternoon folks,

I have an HP-86 system that I am not using, and I would like to sell to someone 
who will put it to good use.

The system is made up of:

- HP-86B
- HP-9121 Dual 3.5” floppy disk drive
- HP-82900A Auxiliary Processor (CP/M System) with the proper boot disk
- the new HP85Disk for virtual disk drives if you don’t want to use real 
floppies, or to use along with real floppies
- HP-82929 Programmable ROM Module
- An 87-EMS ROM, never installed
- HP-82936A ROM Drawer, with a few HP-85 ROMs in it

Sorry, but I will be keeping my CRT monitor.

To be sure, I invested a pile of $$ into this over the years, but as I said, 
I’m just not using it any more, and I hate to see this good stuff going unused. 
 I’d like to get $400 for the whole kit-and-kaboodle.  I’d also like to work 
with someone who can pick it up, or we can meet half way in between.  I’d 
really prefer not to go through all the expense and hassle of shipping.

Please let me know if you’re interested and whatever questions you may have.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Re: Tiny PDP-11/73 system for sale

[Stephen Pereira via cctalk]

I have had a couple of inquiries on my system, but no takers yet.
I just want to let folks know that it is still available.
Please read the description - that is exactly what is for sale.
Please contact me for photos.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> On Jan 20, 2022, at 12:25 PM, Stephen Pereira 
>  wrote:
> 
> I am in the process of thinning down my vintage computer holdings, to relieve 
> some of the burden I will leave to my heirs (hopefully not too soon!).
> 
> I have a working tiny PDP-11/73 system available for sale.  I would much 
> prefer not to have to break it down and pack it for shipping, but I will if 
> the buyer agrees to pay for the packing and shipping costs.
> 
> - - - - -
> 
> Tiny PDP-11/73 System:
> 
> H9281-BA backplane and card cage
> KDJ11-A CPU
> DLV11-J 4 port SIO
> MSV11-LK 256KB/128KW memory
> Emulex UC07 SCSI interface
> 
> Power-on Reset board from here:
> http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por 
> 
> 
> SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed
> 
> MeanWell RT-125B power supply
> 
> 4.5 inch AC fan
> 
> qty 4 GlitchWorks serial cables
> 
> Spare PDP-11/23 CPU saved as a backup:
> KDF11-AB CPU
> 
> RT-11 Pocket Guide
> 
> RT-11 Mini-Reference Manual
> 
> - - - - -
> 
> I am asking $800.00 for the lot.  It cost me about that, probably more to 
> acquire it piece-by-piece and assemble it into a working system.
> 
> smp
> - - -
> Stephen Pereira
> Bedford, NH  03110
> KB1SXE
> 
> 

Re: Tiny PDP-11/73 system for sale

[Stephen Pereira via cctalk]

Indeed it is!

Are you in the Manchester, NH area?

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> On Jan 20, 2022, at 12:34 PM, Ed C.  wrote:
> 
> I'll take it if still available. 
> 
> Ed
> 
> On Thu, Jan 20, 2022 at 6:26 PM Stephen Pereira via cctech 
> mailto:cct...@classiccmp.org>> wrote:
> I am in the process of thinning down my vintage computer holdings, to relieve 
> some of the burden I will leave to my heirs (hopefully not too soon!).
> 
> I have a working tiny PDP-11/73 system available for sale.  I would much 
> prefer not to have to break it down and pack it for shipping, but I will if 
> the buyer agrees to pay for the packing and shipping costs.
> 
> - - - - -
> 
> Tiny PDP-11/73 System:
> 
> H9281-BA backplane and card cage
> KDJ11-A CPU
> DLV11-J 4 port SIO
> MSV11-LK 256KB/128KW memory
> Emulex UC07 SCSI interface
> 
> Power-on Reset board from here:
> http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por 
>  
>  >
> 
> SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed
> 
> MeanWell RT-125B power supply
> 
> 4.5 inch AC fan
> 
> qty 4 GlitchWorks serial cables
> 
> Spare PDP-11/23 CPU saved as a backup:
> KDF11-AB CPU
> 
> RT-11 Pocket Guide
> 
> RT-11 Mini-Reference Manual
> 
> - - - - -
> 
> I am asking $800.00 for the lot.  It cost me about that, probably more to 
> acquire it piece-by-piece and assemble it into a working system.
> 
> smp
> - - -
> Stephen Pereira
> Bedford, NH  03110
> KB1SXE
> 
> 

Tiny PDP-11/73 system for sale

[Stephen Pereira via cctalk]

I am in the process of thinning down my vintage computer holdings, to relieve 
some of the burden I will leave to my heirs (hopefully not too soon!).

I have a working tiny PDP-11/73 system available for sale.  I would much prefer 
not to have to break it down and pack it for shipping, but I will if the buyer 
agrees to pay for the packing and shipping costs.

- - - - -

Tiny PDP-11/73 System:

H9281-BA backplane and card cage
KDJ11-A CPU
DLV11-J 4 port SIO
MSV11-LK 256KB/128KW memory
Emulex UC07 SCSI interface

Power-on Reset board from here:
http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por 


SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed

MeanWell RT-125B power supply

4.5 inch AC fan

qty 4 GlitchWorks serial cables

Spare PDP-11/23 CPU saved as a backup:
KDF11-AB CPU

RT-11 Pocket Guide

RT-11 Mini-Reference Manual

- - - - -

I am asking $800.00 for the lot.  It cost me about that, probably more to 
acquire it piece-by-piece and assemble it into a working system.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Tiny PDP-11/73 system for sale

[Stephen Pereira via cctalk]

I am in the process of thinning down my vintage computer holdings, to relieve 
some of the burden I will leave to my heirs (hopefully not too soon!).

I have a working tiny PDP-11/73 system available for sale.  I would much prefer 
not to have to break it down and pack it for shipping, but I will if the buyer 
agrees to pay for the packing and shipping costs.

- - - - -

Tiny PDP-11/73 System:

H9281-BA backplane and card cage
KDJ11-A CPU
DLV11-J 4 port SIO
MSV11-LK 256KB/128KW memory
Emulex UC07 SCSI interface

Power-on Reset board from here:
http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por

SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed

MeanWell RT-125B power supply

4.5 inch AC fan

qty 4 GlitchWorks serial cables

Spare PDP-11/23 CPU saved as a backup:
KDF11-AB CPU

RT-11 Pocket Guide

RT-11 Mini-Reference Manual

- - - - -

I am asking $800.00 for the lot.  It cost me about that, probably more to 
acquire it piece-by-piece and assemble it into a working system.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Re: Altair 8800 reproduction

[Stephen Pereira via cctalk]

I had the same confusion about Mike’s Altair 8800c not being a complete kit, 
and wondering what it would take to “upgrade” my Altair 8800 Clone to be a real 
Altair 8800c a bit more than a year ago.  I ended up not finding very much 
assistance at the time, so I bulled my way through it, and got it done using 
the info and pointers from Mike’s site.

Another time someone asked about this I posted my experience on the VCF.  See 
this:  
http://www.vcfed.org/forum/showthread.php?69929-Altair-8800-clone-cost-to-build=571710#post571710
 


Mike’s original topic on VCF is here:  
http://www.vcfed.org/forum/showthread.php?66737-Building-and-Altair-8800-from-Scratch-in-2018=Altair+8800c

The bottom line is that you *can* get it done with the info and pointers that 
Mike provides on his site.  He is also reachable on the VCF and also by 
telephone.  He is tremendously helpful and will answer any questions that you 
may have.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> On Jul 24, 2020, at 1:00 PM, cctech-requ...@classiccmp.org wrote:
> 
> 
> Message: 13
> Date: Fri, 24 Jul 2020 11:15:34 +0800
> From: Tom Hunter 
> To: Greg Beat 
> Cc: "General Discussion: On-Topic and Off-Topic Posts"
>   
> Subject: Re: Altair 8800 reproduction
> Message-ID:
>   
> Content-Type: text/plain; charset="UTF-8"
> 
> Hi Greg,
> 
> I saw Mike Douglas' Altair 8800c but he writes on his website that this is
> not a complete kit. I got the impression that he offers only the front
> panel PCBs, FDC and SIO and maybe the S100 motherboard.
> 
> Thank you for the link to the S100computers group. There is a lot of useful
> info there.
> 
> I am retired now and always wanted an Altair 8800. It is time to make that
> dream reality. The easiest and more affordable path would be the Altair
> 8800 clone but somehow I am more attracted to the non-emulated
> implementation.
> 
> Thanks again
> Tom Hunter
> 
> 
> 
> On Fri, Jul 24, 2020 at 3:02 AM Greg Beat  wrote:
> 
>> ?Tom,
>> Grant moved shortly after this Kit offering, over a decade ago.
>> That kit is OVER (Grant no longer offering).
>> 
>> Participate in the S100computers Group: http://www.s100computers.com/
>> Join the List at Google Group: S100Computers
>> https://groups.google.com 
>> 
>> Grant special ordered the metal fabrication, at that time, from the
>> original metal fabricators (Optima, $$), who have gone thru mergers &
>> off-shoring.
>> Mike Douglas looked into that chassis possibility ? but was cost
>> prohibitive (>$300).
>> 
>> Mike Douglas offers BOTH the Altair Clone (you referenced) AND
>> the Altair 8800c Kits (November 2018).  This case he had fabricated is a
>> close look-a-like, but Lighter in weight.  Still the case alone is $300 .
>> This case does not have the internal Optima sub chassis (weight) and rails.
>> ?https://deramp.com/altair_8800c.html
>> 
>> Suggest you look at Mike?s multiple vintage computer offerings (web site)
>> AND
>> https://deramp.com/
>> 
>> His YouTube Videos (deramp5113).  Here is the Altair 8800c, shown November
>> 2018
>> https://youtu.be/Q5LjkL5b4n8
>> 
>> greg
>> w9gb
>> ==
>> From: Tom Hunter 
>> To: "General Discussion? 
>> Subject: Altair 8800 reproduction
>> 
>> About 10 years ago Grant Stockly in Anchorage Alaska produced high quality
>> MITS Altair 8800 reproductions in kit form. The website still exists:
>> http://www.altairkit.com/
>> 
>> I have tried to contact Grant but did not get a reply. Does anyone know if
>> these kits are still available? Is Grant on this forum?
>> 
>> Alternatively is somebody else making complete Altair 8800 kits? I have
>> found people making individual boards but not a complete kit.
>> 
>> There is also the Altair 8800 clone which is based on a PIC microcontroller
>> emulating the entire original Altair 8800. It is cute but not the real
>> thing.
>> 
>> Thanks
>> Tom Hunter
>> 
>> Sent from iPad Air
>> 

Re: Parasitic Engineering Altair Clock Fix Kit...

[Stephen Pereira via cctalk]

Thanks a million, Mike, for scanning and posting this.

I purchased this fix for my Altair way back when for $15, and it’s been one of 
those things that I’ve never been able to find online.  

I never purchased the Parasitic Engineering power supply fix, but I have found 
it online.  The Parasitic Engineering clock fix has eluded me until now.

BTW, IIRC, the PE clock fix worked excellently and I never had any clock 
related issues after installing it.  The S-100 bus, the weak power supply, not 
enough slots, all those wires on the bus, all gave me plenty of headaches, but 
the clock fix worked great!

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> On Feb 22, 2020, at 1:00 PM, cctech-requ...@classiccmp.org wrote:
> 
> Message: 15
> Date: Fri, 21 Feb 2020 21:25:45 -0600
> From: Mike Douglas 
> To: cctalk@classiccmp.org
> Subject: Re: Parasitic Engineering Altair Clock Fix Kit...
> Message-ID: <8f336a6c-bacb-44e7-b3d4-dfaa00d1e...@yahoo.com>
> Content-Type: text/plain; charset=us-ascii
> 
> I scanned my Parasitic clock mod documents and put them at the link below.
> 
> https://deramp.com/downloads/altair/hardware/altair_8800_computer/Parasitic%20Clock%20Mod.pdf
> 
> Mike
> 

Two Kaypro 2 Computers, Disks, Documents

[Stephen Pereira via cctalk]

I have two Kaypro 2 computers, some disks and some documents that I’d like to 
sell.
$250 OBO takes the entire lot..
One of the computers worked the last time I set it up and tried it - a few 
years ago.
The other one had some problem with the disk drives and did not boot, IIRC.

If anyone is interested, they are available for local pickup or reasonable 
drive to a meeting point.  I’m in Bedford, NH, just west of Manchester, NH.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Two Kaypro 2 Computers, Disks, Documents

[Stephen Pereira via cctalk]

I have two Kaypro 2 computers, some disks and some documents that I’d like to 
sell.
$250 OBO takes the entire lot..
One of the computers worked the last time I set it up and tried it - a few 
years ago.
The other one had some problem with the disk drives and did not boot, IIRC.

If anyone is interested, they are available for local pickup or reasonable 
drive to a meeting point.  I’m in Bedford, NH, just west of Manchester, NH.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Re: Looking for North star software

[Stephen Pereira via cctalk]

I believe that Mike Douglas has a utility program that you can get into a 
Northstar Horizon, and then it can receive a .DSK image sent from the terminal 
and it will write the disk for you in the Horizon.

It’s called PCtoFlop and I think he has it in his archive here:

http://deramp.com/downloads/north_star/ 


Good luck!

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> --
> 
> Message: 14
> Date: Tue, 3 Jul 2018 00:16:45 +
> From: dwight 
> To: Fred Cisin , "General Discussion: On-Topic and
>   Off-Topic Posts" 
> Subject: Re: Looking for North star software
> Message-ID:
>   
> 
>   
> Content-Type: text/plain; charset="us-ascii"
> 
> I was thinking someone has already done this. If no, as you say, it is not an 
> impossible task.
> 
> The TSS/B is suppose to be their scientific package. It at least has BASIC in 
> it. I have another disk marked CP/M in the same box. I should be able to put 
> something together under CP/M.
> 
> It is a North Star Horizon. There seems to be some images out there so I 
> don't know how they are being captured.
> 
> Dwight
> 
> 

Re: 6800 fig-FORTH?

[Stephen Pereira via cctalk]

Yes, after it signs on, I am in a state that anything I type is echoed.  When I 
type a CR, the cursor goes back all the way to the left, as it should.  If I 
type CTRL-J for LF, the cursor drops down 2 lines, as it should (because of the 
double echo).

Thanks for the tip about inserting DB #0 after the JMPs that the assembler 
changes to BRAs.  I’ll give that a try.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> On Jun 23, 2018, at 9:19 PM, dwight  wrote:
> 
> I found a fig-forth listing at:
> http://www.forth.org/fig-forth/fig-forth_6800.pdf 
> 
> I can see that it is waiting for a $0D. See the line after EXPEC3, label.
> If you have a monitor running, you should be able to check the TIB for the 
> return character ( I'n not positive it doesn't trap it out first ).
> To help isolate the problem, when you hit enter does it continue to allow you 
> to enter text and echo it or does it just die?
> I defeat the optimization, you can place a DB #0 after each JMP in the code. 
> That will pad it to the original length and make checking a lot easier.
> I can help more as you progress. These original listings all were able to 
> boot and execute an input line. They were known to have more hidden errors 
> with operations like U> and such.
> Dwight
>  

6800 fig-FORTH?

[Stephen Pereira via cctalk]

Hi folks,

I know there's not much 6800 activity here, but I figure this would be worth a 
try.

Has anyone here ever seen or ever had fig-FORTH for the 6800 working?

I have a SWTPC replica system from Bob Applegate / Corsham Technologies, and I 
love it. It came with a complete 64K RAM, as well as the SWIBUG monitor, and 
the monitor code has been extended by Bob/Corsham to interface with an SD Card 
sub-system for floppy disk emulation. This provides the original terminal 
access to the machine with the simple system monitor, and also the FLEX OS for 
running programs. It is a blast to use.

Recently, I took a look around and found the fig-FORTH listing as originally 
published back in 1979, and also a Source Forge site that holds an electronic 
copy:

https://sourceforge.net/projects/asm...th_6800-stuff/ 


I've managed to get the source code to assemble with a cross-assembler supplied 
by Bob/Corsham. It does not produce an exact copy of the original code, because 
the code uses the JMP instruction pretty much exclusively, and the assembler 
substitutes a relative BRA instruction sometimes. So my code ends up being 
several bytes shorter because of saving one byte each time a JMP is replaced by 
a BRA. That said, it appears to me that the code matches up with the original 
listing otherwise.

So my problem is this: When I run the code on my system, fig-FORTH seems to 
sign on, and will accept input from the keyboard (double echos of each key 
typed) but it then does not proceed to interpret the command entered. The 
interesting thing I see by winding my way around in the code is that it has 
already properly performed a bunch of setup and produces the initial "Forth-68" 
sign on, and that has required it to already be using many of the Forth 
commands that were defined by machine language. This indicates to me that some 
of the command interpretation is working. The I/O from/to the terminal is by 
calls to the system monitor I/O routines, and that seems to be also working, 
despite the double echos of the typed characters. It just does not proceed to 
interpret what is typed in at all.

Of course, I have no idea if this code ever worked properly, or if I am 
encountering early buggy code. So I'm looking to see if anyone else has ever 
seen the fig-FORTH working on a 6800 system? Any pointers to good working code?

Thanks for listening!

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Re: cctech Digest, Vol 38, Issue 14

[Stephen Pereira via cctalk]

> On Nov 15, 2017, at 1:00 PM, cctech-requ...@classiccmp.org wrote:
> 
> --
> 
> Message: 4
> Date: Tue, 14 Nov 2017 15:56:31 -0800
> From: "Mark J. Blair" 
> To: "General Discussion: On-Topic and Off-Topic Posts"
>   
> Subject: WTB: HP-85 16k RAM Module and HPIB Floppy Drive
> Message-ID: <0cb24df8-6d74-4a25-9263-73b24eb19...@nf6x.net>
> Content-Type: text/plain; charset=us-ascii
> 
> I just got my HP-85 working for the first time over the weekend (except for 
> its tape drive, which is still a work in progress). I'd like to acquire some 
> accessories for it:
> 
> 1) HP 82903A 16k RAM module
> 
> 2) HP 9122C dual 1.44M 3.2" floppy diskette drive
> 
> Do any of y'all have either of those items available for swap or sale? I'm 
> located in southern California.
> 
> Those two items are at the top of my HP-85 want list, but I might also be 
> interested in other related bits such as the 82940A GPIO Interface, other 
> compatible HPIB mass storage, etc.
> 
> -- 
> Mark J. Blair, NF6X 
> http://www.nf6x.net/
> 
> 
> 
> --
> 

Hi Mark,

I believe that I have both of those things available.

If you’re interested, please contact me at:  stephen.m.pereira.sr AT gmail DOT 
com

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Re: WTB: DEC Rainbow Expansion Memory

[Stephen Pereira via cctalk]

I’m glad to hear that you still have some possibilities there.  I’ve go nothing 
on mine.  I guess I’ll have to start looking for another RX-50 disk drive 
controller board.  Since those are as scarce as the memory expansion boards, 
I’m not very hopeful.

Guess it’ll be time to sell the parts on eBay…  Hopefully, I can get some of my 
investment back.

smp
--
Stephen M. Pereira
Bedford, NH  03110
KB1SXE

> On Apr 12, 2017, at 3:49 PM, Warner Losh  wrote:
> 
> Thanks! I have another experiment to try, but need some parts for
> that, so it will have to wait until they arrive. the unit has been a
> bit flakey this time, so I don't know if I need a new controller
> board, new RX-50 or a new power supply. Or a ROM refresh
> 
> Warner
> 
> On Wed, Apr 12, 2017 at 1:47 PM, Stephen Pereira
>  wrote:
>> Wow.  Since misery loves company, I guess we make a great pair today!
>> 
>> Good luck with your equipment!
>> 
>> smp
>> --
>> Stephen M. Pereira
>> Bedford, NH  03110
>> KB1SXE
>> 
>> On Apr 12, 2017, at 3:41 PM, Warner Losh  wrote:
>> 
>> For you and me both. I was getting read errors on my RX-50, so I tried
>> to swap in a new drive, and now that's all I get as well. Guess I'll
>> have to figure out another way to get the Venix/86R disks copied.
>> 
>> Warner
>> 
>> On Wed, Apr 12, 2017 at 1:23 PM, Stephen Pereira
>>  wrote:
>> 
>> I guess it doesn’t make any difference now.  I reassembled the computer and
>> now I get a message 28 “RX50 Controller Board" failure during POST.
>> I’ve taken it apart and put it back together several times, but I cannot
>> clear the failure.  This really has been a bad day!
>> 
>> smp
>> --
>> Stephen M. Pereira
>> Bedford, NH  03110
>> KB1SXE
>> 
>> On Apr 12, 2017, at 3:07 PM, Warner Losh  wrote:
>> 
>> On Wed, Apr 12, 2017 at 1:00 PM, Stephen Pereira
>>  wrote:
>> 
>> Thanks for your response.
>> 
>> Just to be certain, I just tore it all down and reconfirmed, in case my
>> memory was playing any tricks.
>> 
>> I have a PC-100B with no expansion card.
>> 
>> Thanks again for the advice.
>> 
>> 
>> Bummer. The cards come up from time to time in different places, but
>> there's none on ebay right now. Last summer there were like 5,
>> including one that had an 8087 coprocessor option...
>> 
>> smp
>> --
>> Stephen M. Pereira
>> Bedford, NH  03110
>> KB1SXE
>> 
>> On Apr 12, 2017, at 2:20 PM, Warner Losh  wrote:
>> 
>> On Wed, Apr 12, 2017 at 11:06 AM, Stephen Pereira via cctech
>>  wrote:
>> 
>> I’m looking for expansion memory for my DEC Rainbow.
>> 
>> I currently have 128K RAM, and I’d like to have 256K RAM, so I can actually
>> use the Lotus 1-2-3 that I recently purchased (without thinking).
>> 
>> Any suggestions?
>> 
>> 
>> So is this a 100A with a 64k expansion card? Or is it the 100B with no card?
>> 
>> If you have the 100A and a 3-bank expansion card, you should be able
>> to remove the 64k chips that are on there and replace them with 256k
>> chips. You should be able to take it to 832k with 27 256kbit DRAM
>> chips. 41256-120's in DIP 16 if I recall correctly. Need to set the
>> DIP switches correctly. This is the easiest path forward, if you are
>> lucky enough to have this configuration, since chips are easy to get,
>> relatively speaking, and last time I priced them, they were ~0.70 each
>> so this will set you back ~$20 from JAMECO. You'll want an anti-static
>> setup to do this, since the BBSs were full of people that had done
>> this w/o adequate setup blowing up their card / chips. IMHO, if you
>> are going this route, it's not worth messing with 64k chips since the
>> price difference is tiny and the win for 3 banks of 256k on the
>> Rainbow is big.
>> 
>> If you have a 100B with no expansion card, I can't help... The
>> expansion card is the hard bit these days...
>> 
>> Warner
>> 
>> 
>> 
>> 

Re: WTB: DEC Rainbow Expansion Memory

[Stephen Pereira via cctalk]

I guess it doesn’t make any difference now.  I reassembled the computer and now 
I get a message 28 “RX50 Controller Board" failure during POST. 
I’ve taken it apart and put it back together several times, but I cannot clear 
the failure.  This really has been a bad day!

smp
--
Stephen M. Pereira
Bedford, NH  03110
KB1SXE

> On Apr 12, 2017, at 3:07 PM, Warner Losh  wrote:
> 
> On Wed, Apr 12, 2017 at 1:00 PM, Stephen Pereira
>  wrote:
>> Thanks for your response.
>> 
>> Just to be certain, I just tore it all down and reconfirmed, in case my
>> memory was playing any tricks.
>> 
>> I have a PC-100B with no expansion card.
>> 
>> Thanks again for the advice.
> 
> Bummer. The cards come up from time to time in different places, but
> there's none on ebay right now. Last summer there were like 5,
> including one that had an 8087 coprocessor option...
> 
>> smp
>> --
>> Stephen M. Pereira
>> Bedford, NH  03110
>> KB1SXE
>> 
>> On Apr 12, 2017, at 2:20 PM, Warner Losh  wrote:
>> 
>> On Wed, Apr 12, 2017 at 11:06 AM, Stephen Pereira via cctech
>>  wrote:
>> 
>> I’m looking for expansion memory for my DEC Rainbow.
>> 
>> I currently have 128K RAM, and I’d like to have 256K RAM, so I can actually
>> use the Lotus 1-2-3 that I recently purchased (without thinking).
>> 
>> Any suggestions?
>> 
>> 
>> So is this a 100A with a 64k expansion card? Or is it the 100B with no card?
>> 
>> If you have the 100A and a 3-bank expansion card, you should be able
>> to remove the 64k chips that are on there and replace them with 256k
>> chips. You should be able to take it to 832k with 27 256kbit DRAM
>> chips. 41256-120's in DIP 16 if I recall correctly. Need to set the
>> DIP switches correctly. This is the easiest path forward, if you are
>> lucky enough to have this configuration, since chips are easy to get,
>> relatively speaking, and last time I priced them, they were ~0.70 each
>> so this will set you back ~$20 from JAMECO. You'll want an anti-static
>> setup to do this, since the BBSs were full of people that had done
>> this w/o adequate setup blowing up their card / chips. IMHO, if you
>> are going this route, it's not worth messing with 64k chips since the
>> price difference is tiny and the win for 3 banks of 256k on the
>> Rainbow is big.
>> 
>> If you have a 100B with no expansion card, I can't help... The
>> expansion card is the hard bit these days...
>> 
>> Warner
>> 
>> 

Re: WTB: DEC Rainbow Expansion Memory

[Stephen Pereira via cctalk]

Wow.  Since misery loves company, I guess we make a great pair today!

Good luck with your equipment!

smp
--
Stephen M. Pereira
Bedford, NH  03110
KB1SXE

> On Apr 12, 2017, at 3:41 PM, Warner Losh  wrote:
> 
> For you and me both. I was getting read errors on my RX-50, so I tried
> to swap in a new drive, and now that's all I get as well. Guess I'll
> have to figure out another way to get the Venix/86R disks copied.
> 
> Warner
> 
> On Wed, Apr 12, 2017 at 1:23 PM, Stephen Pereira
>  wrote:
>> I guess it doesn’t make any difference now.  I reassembled the computer and
>> now I get a message 28 “RX50 Controller Board" failure during POST.
>> I’ve taken it apart and put it back together several times, but I cannot
>> clear the failure.  This really has been a bad day!
>> 
>> smp
>> --
>> Stephen M. Pereira
>> Bedford, NH  03110
>> KB1SXE
>> 
>> On Apr 12, 2017, at 3:07 PM, Warner Losh  wrote:
>> 
>> On Wed, Apr 12, 2017 at 1:00 PM, Stephen Pereira
>>  wrote:
>> 
>> Thanks for your response.
>> 
>> Just to be certain, I just tore it all down and reconfirmed, in case my
>> memory was playing any tricks.
>> 
>> I have a PC-100B with no expansion card.
>> 
>> Thanks again for the advice.
>> 
>> 
>> Bummer. The cards come up from time to time in different places, but
>> there's none on ebay right now. Last summer there were like 5,
>> including one that had an 8087 coprocessor option...
>> 
>> smp
>> --
>> Stephen M. Pereira
>> Bedford, NH  03110
>> KB1SXE
>> 
>> On Apr 12, 2017, at 2:20 PM, Warner Losh  wrote:
>> 
>> On Wed, Apr 12, 2017 at 11:06 AM, Stephen Pereira via cctech
>>  wrote:
>> 
>> I’m looking for expansion memory for my DEC Rainbow.
>> 
>> I currently have 128K RAM, and I’d like to have 256K RAM, so I can actually
>> use the Lotus 1-2-3 that I recently purchased (without thinking).
>> 
>> Any suggestions?
>> 
>> 
>> So is this a 100A with a 64k expansion card? Or is it the 100B with no card?
>> 
>> If you have the 100A and a 3-bank expansion card, you should be able
>> to remove the 64k chips that are on there and replace them with 256k
>> chips. You should be able to take it to 832k with 27 256kbit DRAM
>> chips. 41256-120's in DIP 16 if I recall correctly. Need to set the
>> DIP switches correctly. This is the easiest path forward, if you are
>> lucky enough to have this configuration, since chips are easy to get,
>> relatively speaking, and last time I priced them, they were ~0.70 each
>> so this will set you back ~$20 from JAMECO. You'll want an anti-static
>> setup to do this, since the BBSs were full of people that had done
>> this w/o adequate setup blowing up their card / chips. IMHO, if you
>> are going this route, it's not worth messing with 64k chips since the
>> price difference is tiny and the win for 3 banks of 256k on the
>> Rainbow is big.
>> 
>> If you have a 100B with no expansion card, I can't help... The
>> expansion card is the hard bit these days...
>> 
>> Warner
>> 
>> 
>> 

Re: WTB: DEC Rainbow Expansion Memory

[Stephen Pereira via cctalk]

Thanks for your response.

Just to be certain, I just tore it all down and reconfirmed, in case my memory 
was playing any tricks.

I have a PC-100B with no expansion card.

Thanks again for the advice.

smp
--
Stephen M. Pereira
Bedford, NH  03110
KB1SXE

> On Apr 12, 2017, at 2:20 PM, Warner Losh  wrote:
> 
> On Wed, Apr 12, 2017 at 11:06 AM, Stephen Pereira via cctech
>  wrote:
>> I’m looking for expansion memory for my DEC Rainbow.
>> 
>> I currently have 128K RAM, and I’d like to have 256K RAM, so I can actually 
>> use the Lotus 1-2-3 that I recently purchased (without thinking).
>> 
>> Any suggestions?
> 
> So is this a 100A with a 64k expansion card? Or is it the 100B with no card?
> 
> If you have the 100A and a 3-bank expansion card, you should be able
> to remove the 64k chips that are on there and replace them with 256k
> chips. You should be able to take it to 832k with 27 256kbit DRAM
> chips. 41256-120's in DIP 16 if I recall correctly. Need to set the
> DIP switches correctly. This is the easiest path forward, if you are
> lucky enough to have this configuration, since chips are easy to get,
> relatively speaking, and last time I priced them, they were ~0.70 each
> so this will set you back ~$20 from JAMECO. You'll want an anti-static
> setup to do this, since the BBSs were full of people that had done
> this w/o adequate setup blowing up their card / chips. IMHO, if you
> are going this route, it's not worth messing with 64k chips since the
> price difference is tiny and the win for 3 banks of 256k on the
> Rainbow is big.
> 
> If you have a 100B with no expansion card, I can't help... The
> expansion card is the hard bit these days...
> 
> Warner

WTB: DEC Rainbow Expansion Memory

[Stephen Pereira via cctalk]

I’m looking for expansion memory for my DEC Rainbow.

I currently have 128K RAM, and I’d like to have 256K RAM, so I can actually use 
the Lotus 1-2-3 that I recently purchased (without thinking).

Any suggestions?

Thanks,
smp
—
Stephen M. Pereira
Bedford, NH  03110
KB1SXE