On 4/23/22 13:12, Fred Cisin via cctalk wrote:
> On Sat, 23 Apr 2022, Craig Ruff via cctech wrote:
>> The P112's floppy controller is the one in the SMSC FDC37C665IR
>> SuperIO chip. The data sheet states it is a 2.88 MB "Licensed CMOS
>> 765B Floppy Disk
On Sat, 23 Apr 2022, Craig Ruff via cctech wrote:
The P112's floppy controller is the one in the SMSC FDC37C665IR SuperIO
chip. The data sheet states it is a 2.88 MB "Licensed CMOS 765B Floppy
Disk Controller" and claims 100% IBM compatibility (for what that's
worth).
2
The P112's floppy controller is the one in the SMSC FDC37C665IR SuperIO chip.
The data sheet states it is a 2.88 MB "Licensed CMOS 765B Floppy Disk
Controller" and claims 100% IBM compatibility (for what that's worth).
On 12/2/19 6:10 PM, Bill Gunshannon via cctalk wrote:
> It starts out with no partitions and claims the partition table
> is not a valid P112 table. The "w" command fixes that but the
> table is still empty. Interestingly enough, a 64M CF in an IDE
> adapter works with FDIS
ormance format the floppy first under CP/M, so
the sectors will have the optimum interleave value for the
P112 hardware. Otherwise, disk accesses will be very slow."
This is not accurate. When I used a brand new pre-formatted floppy
without formatting it under CP/M it booted but many
Hi Bill,
On Wed, Dec 04, 2019 at 01:06:39AM +, Bill Gunshannon via cctalk wrote:
> On 12/3/19 7:51 PM, Craig Ruff via cctech wrote:
> > Just in case someone else hasn't already responded, the P112 does not use
> > DOS style fdisk partitioning for a hard disk. It is do
ad worked on a floppy. Problem
>> was the size of the partitions. I had tried just making one
>> partition for the test I learned that FDISK will make partitions
>> too big for any of the P112 OSes. I now have a hard disk with
>> 5 partitions to play with. On to the n
making one
partition for the test I learned that FDISK will make partitions
too big for any of the P112 OSes. I now have a hard disk with
5 partitions to play with. On to the next problem.
Is it a specific size limit?
(something on the order of number of bits for block number?)
On 12/3/19 7:51 PM, Craig Ruff via cctech wrote:
> Just in case someone else hasn't already responded, the P112 does not use DOS
> style fdisk partitioning for a hard disk. It is done in the BIOS image, and
> then the logical disks have to be initialized. This is described in the
Just in case someone else hasn't already responded, the P112 does not use DOS
style fdisk partitioning for a hard disk. It is done in the BIOS image, and
then the logical disks have to be initialized. This is described in the "P112
GIDE Construction.pdf" document.
I've onl
gt;
> The more I think about this, the more I think maybe the thing that
> "fixed" mine was wiping the drive before trying FDISK.
Wiping with what.
>
> You didn't show the full FDISK session, or a listing of what partitions
> it thinks are there to begin with. Th
> The menu you get when you hit Escape on startup has an option for
> setting a floppy as 8". Mine is ROM 5.7 which I believe is the next
> to last. Unless it is different than the other CP/M systems I have
> FORMAT should have no hardware dependent code in it. It was the OS
> that tracked
On 12/2/19 4:55 PM, Dennis Boone via cctalk wrote:
> > Well, I have the dBit FDADAP. Works great. I have used them before
> > on a PC to access PDP-11 disks from PUTR and E11. The P112 claims to
> > support 8" but I am finding it unlikely. If it (well, at least
> Well, I have the dBit FDADAP. Works great. I have used them before
> on a PC to access PDP-11 disks from PUTR and E11. The P112 claims to
> support 8" but I am finding it unlikely. If it (well, at least the
> OSes it runs) don't even know it only has 77 tracks I c
On 12/2/19 11:31 AM, Lamar Owen wrote:
>
>
> As far as 8-inch drives are concerned, you would need to do exactly
> everything you would need to do to hook up an 8-inch drive to a PC,
> since the P112 uses a PC SuperIO chip for the FDC, and the floppy
> headers have PC
On 11/29/19 7:01 PM, Bill Gunshannon via cctalk wrote:
Let's try again with the right name in the Subject line! It's not
really classic (although it does try to pretend to be but does anyone
here do anything with the P112 SBC? I am trying to get 8" disks
running on it but I
On 12/1/19 2:40 PM, Fred Cisin via cctalk wrote:
>
> TG43 is absolutely NOT needed for reading.
TG43 is also referred to as "RWC" reduced write current. Mostly
useful for FM recording; MFM uses precompensation, which subtly shifts
the timing of write pulses.
--Chuck
On Sun, 1 Dec 2019, David Griffith via cctalk wrote:
On the 8" drive question, I haven't done it myself, but I've received
reports from people who've successfully used them with the P112. It
involves pretending they're HD 5.25" drives and using a hardware shim
On Sun, 1 Dec 2019, Warner Losh via cctalk wrote:
On Sun, Dec 1, 2019, 12:09 PM Al Kossow via cctalk
wrote:
Here's the archive
http://www.retroarchive.org/maslin/
HERE is the archive
https://www.computerhistory.org/collections/catalog/102703903
Another curator and I went down to San D
On Sun, 1 Dec 2019, Al Kossow via cctalk wrote:
Here's the archive
http://www.retroarchive.org/maslin/
HERE is the archive
https://www.computerhistory.org/collections/catalog/102703903
Another curator and I went down to San Diego and both ended up with heat
exhaustion
recovering it from
On Sun, Dec 1, 2019, 12:09 PM Al Kossow via cctalk
wrote:
>
> > Here's the archive
> >
> > http://www.retroarchive.org/maslin/
>
>
> HERE is the archive
>
> https://www.computerhistory.org/collections/catalog/102703903
>
> Another curator and I went down to San Diego and both ended up with heat
>
On December 1, 2019 11:09:29 AM PST, Al Kossow via cctalk
wrote:
>
>> Here's the archive
>>
>> http://www.retroarchive.org/maslin/
>
>
>HERE is the archive
>
>https://www.computerhistory.org/collections/catalog/102703903
>
>Another curator and I went down to San Diego and both ended up with
>hea
> Here's the archive
>
> http://www.retroarchive.org/maslin/
HERE is the archive
https://www.computerhistory.org/collections/catalog/102703903
Another curator and I went down to San Diego and both ended up with heat
exhaustion
recovering it from a storage unit in the middle of summer.
you'
k/Software Images. Boot disks for lots
>>> of different vintage computers are here. It's not nearly the
>>> size of Don Maslin's lost archive, but it's a start.
>>>
>>
>> I don't keep up with CP/M etc but I thought I recall it be
g
announced that Don Maslin's lost archive had been recovered?
Here's the archive
http://www.retroarchive.org/maslin/
P112 I think is way newer than anything related though.
Regards,
Peter Coghlan.
On 2019/11/30 23:32:55 -0800, jim stephens via cctalk wrote:
On 11/30/2019 9:45 PM, Eric Dittman via cctalk wrote:
On 11/30/2019 8:34 PM, jim stephens via cctalk wrote:
[snip]
Links.txt
[snip]
http://www.classiccmp.org/dunfield/img/index.htm
Daves Old Computers - Disk/Software
On 11/30/2019 8:34 PM, jim stephens via cctalk wrote:
On 11/30/2019 6:15 PM, Richard Cini via cctalk wrote:
The current P112 is a reissue from years ago, right? I
remember I had one — and I may still have it somewhere — but I only
used it with 3.5” drives. Somehow I think it was
On Sat, Nov 30, 2019, 9:34 PM jim stephens via cctalk
wrote:
>
>
> On 11/30/2019 6:15 PM, Richard Cini via cctalk wrote:
> >
> >
> >
> >
> > The current P112 is a reissue from years ago, right? I remember I
> had one — and I may still have
On 11/30/2019 6:15 PM, Richard Cini via cctalk wrote:
The current P112 is a reissue from years ago, right? I remember I had one — and I may still have it somewhere — but I only used it with 3.5” drives. Somehow I think it was built that way by design (the board outline
The current P112 is a reissue from years ago, right? I remember I had
one — and I may still have it somewhere — but I only used it with 3.5” drives.
Somehow I think it was built that way by design (the board outline fit on a
drive).
I don’t know how available the code
no knowledge of P112 (or P118 :-)) about the wrong
parameters (even though 77 V 80 SEEMS minor), if the parameters are
stored separately for FORMAT V READ/WRITE, that could obviously do it.
If it were to have totally wrong parameters, and tried to put more
sectors on a track than would fit
on via cctalk wrote:
>> I think you missed something. This is a P112 SBC not a PC. I watch
>> the head step from track to track until it runs into the stop after
>> passing the last real track. I have a dbit 8" adapter and it displays
>> the track count and I watch it g
A lot could depend on how the software is interpreting the FDC return
codes.
In the case of PC BIOS (765), error code number 4) that would mean that
On Sun, 1 Dec 2019, Bill Gunshannon via cctalk wrote:
I think you missed something. This is a P112 SBC not a PC. I watch
the head step from
On 11/30/19 7:37 PM, dwight via cctalk wrote:
> Don't 8 inch drives have 77 tracks?
Give that man a cigar. Apparently the P112 doesn't know the
format of 8" disks even though it has an option to set a drive
as 8" in the config.
bill
that you had put there.
>
> PC FDC returns error code 2 for not seeing address mark. However,
> MS-DOS goes through a short list of codes that it knows, and then falls
> through to "error, but none of the above" and says "General Failure" (I
> can't hel
On Sun, 1 Dec 2019, dwight via cctalk wrote:
Don't 8 inch drives have 77 tracks?
YES.
Although 8" "emulation" sometimes cheats and uses 80.
And some users with drives without a physical stop tried to squeeze a few
more tracks (and 41,42 on 360K)
The inability to read those "extra" tracks on
Don't 8 inch drives have 77 tracks?
Dwight
From: cctalk on behalf of Bill Gunshannon via
cctalk
Sent: Saturday, November 30, 2019 9:22 AM
To: emanuel stiebler ; General Discussion: On-Topic and
Off-Topic Posts
Subject: Re: P112
On 11/30/19 9:15 AM, em
On Sat, 30 Nov 2019, Bill Gunshannon via cctalk wrote:
I'll start with the simple and funny one. If i run FORMAT
it formats all 80 tracks. :-) Seems like the definition
for an 8" disk as selected in the config menu is just plain
wrong. Of course, once it formats all 80 :-) tracks any
attempt
On 11/30/19 9:15 AM, emanuel stiebler wrote:
> On 2019-11-29 19:01, Bill Gunshannon via cctalk wrote:
>>
>> Let's try again with the right name in the Subject line!
>>
>> It's not really classic (although it does try to pretend to be
>> but does anyon
On 2019-11-29 19:01, Bill Gunshannon via cctalk wrote:
>
> Let's try again with the right name in the Subject line!
>
> It's not really classic (although it does try to pretend to be
> but does anyone here do anything with the P112 SBC? I am trying to
> get 8&q
Let's try again with the right name in the Subject line!
It's not really classic (although it does try to pretend to be
but does anyone here do anything with the P112 SBC? I am trying to
get 8" disks running on it but I am seeing some rather strange behavior.
bill
> On 12/12/18 6:58 AM, David Griffith via cctalk wrote:
>
> > That's got me thinking... Suppose I redesign the P112 board to take a
> > Z280 CPU. Would you guys go for it? I'd like to come up with a way
> > to use a socketed CPU or put a surface-mounted ch
This?
http://searle.hostei.com/grant/MonitorKeyboard/index.html
It's much more efficient for a poster to provide URLs than for umpteen
others to have to go off searching.
You're welcome.
On Wed, Dec 12, 2018 at 2:04 PM allison via cctalk
wrote:
> >> That is the easy part, where is the 99 cent
king... Suppose I redesign the P112 board to take a
Z280 CPU. Would you guys go for it? I'd like to come up with a way
to use a socketed CPU or put a surface-mounted chip on a carrier board
to allow greater versatility with playing with different Zilog chips.
David,
Cou
>> That is the easy part, where is the 99 cent dumb terminal to go with it?
>> Ben.
>
Ben,
look at Grant Searle's display system, not the Z80 CP/M but his three
chip display system.
Take two Atmel Atmega328Ps and a 74ls166 monitor and P2 keyboard required.
That yields a 24line x 80char display t
retrobrewcomputers.org/doku.php?id=builderpages:plasmo:z280rc
>>> )
>>> and have contacted Hector about porting it to the Z280.
>>
>> That is the easy part, where is the 99 cent dumb terminal to go with it?
>> Ben.
>
> That's got me thinking... Supp
e at
https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:z280rc )
and have contacted Hector about porting it to the Z280.
That is the easy part, where is the 99 cent dumb terminal to go with it?
Ben.
That's got me thinking... Suppose I redesign the P112 board to take a Z280
CPU.
On 12/06/2018 10:37 AM, David Griffith via cctalk wrote:
> On December 6, 2018 6:42:44 AM PST, Bill Gunshannon via cctalk
> wrote:
>> While we are talking about the P122 :-)
>>
>>
>> Has anyone tried and/or had luck using an 8" floppy drive
>>
On December 6, 2018 6:42:44 AM PST, Bill Gunshannon via cctalk
wrote:
>
>While we are talking about the P122 :-)
>
>
>Has anyone tried and/or had luck using an 8" floppy drive
>
>on the P112?
>
>
>bill
I haven't tried it myself, but a few of my c
While we are talking about the P122 :-)
Has anyone tried and/or had luck using an 8" floppy drive
on the P112?
bill
On 12/05/2018 05:00 PM, Torfinn Ingolfsen via cctalk wrote:
> There is a "contact" link on this page:
> http://p112.sourceforge.net/index.php?rsx180
> Maybe it works.
> On Tue, Dec 4, 2018 at 6:48 PM Al Kossow via cctalk
> wrote:
>>
>>
>> On 12/
There is a "contact" link on this page:
http://p112.sourceforge.net/index.php?rsx180
Maybe it works.
On Tue, Dec 4, 2018 at 6:48 PM Al Kossow via cctalk
wrote:
>
>
>
> On 12/4/18 7:51 AM, Dennis Boone via cctalk wrote:
> > > That's all I could find, too. If
On 12/4/2018 1:17 PM, Tony Nicholson via cctalk wrote:
Hello David
I saw your posting on the cctalk mailing list regarding RSX180.
It is Hector Peraza that's been tinkering with this. He intends making the
full source-code available via SourceForge or GitHub but is still working
on preliminary
Hello David
I saw your posting on the cctalk mailing list regarding RSX180.
It is Hector Peraza that's been tinkering with this. He intends making the
full source-code available via SourceForge or GitHub but is still working
on preliminary web pages and documenting etc. No doubt he will provide
e-step capabilities of the chip)
get UZI280 working
(haven't even looked at it yet) and add more utilities, etc. same for Fuzix
port of MP/M better hard
disk support (e.g. via FDISK utility like the one for the P112, with automatic
recognition of
partitions in CP/M and UZI so one will not
> That's all I could find, too. If anyone knows where the source might
> be or stumbles on it, I would definitely be interested as well.
I think that's Hector Peraza's site. His email address is listed; you
could try writing to him.
De
here's a video of a P112 running RSX:
>> https://www.youtube.com/watch?v=5s6IOCCk3Uw
>>
>> If the creator of this thing is reading, I'd very much like to get my
>> hands on RSX-180 and put it up on the P112 page at Sourceforge,
>> Gitlab, et al.
>&g
On Tue, Dec 4, 2018 at 7:45 AM Bill Gunshannon via cctalk <
cctalk@classiccmp.org> wrote:
>
> On 12/4/18 9:28 AM, allison via cctalk wrote:
> > On 12/04/2018 04:26 AM, David Griffith via cctalk wrote:
> >> I don't know who did it, but here's a vi
On 12/4/18 9:28 AM, allison via cctalk wrote:
> On 12/04/2018 04:26 AM, David Griffith via cctalk wrote:
>> I don't know who did it, but here's a video of a P112 running RSX:
>> https://www.youtube.com/watch?v=5s6IOCCk3Uw
>>
>> If the creator of this thing is
On 12/04/2018 04:26 AM, David Griffith via cctalk wrote:
>
> I don't know who did it, but here's a video of a P112 running RSX:
> https://www.youtube.com/watch?v=5s6IOCCk3Uw
>
> If the creator of this thing is reading, I'd very much like to get my
> hands on RSX-1
obably won't be offering complete kits.
>
> Besides Joe, who else would be interested in acquiring one or more P112
> boards?
>
>
> --
> David Griffith
> d...@661.org
>
> A: Because it fouls the order in which people normally read text.
> Q: Why is top-posting s
uiring one or more P112
boards?
--
David Griffith
d...@661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
I don't know who did it, but here's a video of a P112 running RSX:
https://www.youtube.com/watch?v=5s6IOCCk3Uw
If the creator of this thing is reading, I'd very much like to get my
hands on RSX-180 and put it up on the P112 page at Sourceforge, Gitlab,
et al.
--
David Gr
Are there any boards available or rom monitor updates?
On Mon, 9 Apr 2018, Mark G Thomas via cctalk wrote:
Hi Bill,
On Sun, Apr 08, 2018 at 12:36:35AM +, Bill Gunshannon via cctalk wrote:
It's not really Classic Hardware, but it does run some pretty classic
OSes. Anybody here working with the P112? I have had a couple for
ages but
Hi Bill,
On Sun, Apr 08, 2018 at 12:36:35AM +, Bill Gunshannon via cctalk wrote:
>
> It's not really Classic Hardware, but it does run some pretty classic
> OSes. Anybody here working with the P112? I have had a couple for
> ages but never had time to play with them. I
On 2018-04-08 08:37, Bill Gunshannon via cctalk wrote:
>
> None of the disks created with winrawwrite work. I am going to
> assume at this point that USB floppies can not be used to build these
> images. I have a dos box with a real floppy interface but moving stuff
> to it is not easy. (time to
know for when I am testing on other systems as well.
Small steps, but advancing, just the same.
bill
I seem to recall using a USB floppy drive to make P112 disks, but I also
did it using a Linux machine with the dd command. The rawrite.exe program
is very old and I suspect it and modern Windows
riant. Made by several companies, even WD!
Most of those can handle FM/"single density".
5.25" single density is 125K bps
It might support it,> Should have left it the way it was and have people set
the Drive Select
themselves.
in spite of not mentioning it.
All the P112 boa
Should have left it the way it was and have people set the Drive Select
themselves.
Radio Shack used a different approach to drive select by cable instead
of making use of the well documented drive select on the drive.
Radio shack jumpered all drive selects on on the drive, and pulled
pins in the
Should be fun.
Is the FDC a 765 variant?
or a WD 179x variant?
On Sun, 8 Apr 2018, Bill Gunshannon via cctalk wrote:
SMC 37C651. Supports 500 Kb/s, 300 Kb/s and 250 Kb/s Data Rates.
Something else we lost with the PC.
That's a 765 variant. Made by several companies, even WD!
Most of those
On 04/08/2018 04:11 PM, Bill Gunshannon via cctalk wrote:
>
> On 04/08/2018 02:11 PM, Fred Cisin wrote:
> Radio Shack used a different approach to drive select by cable instead
> of making use of the well documented drive select on the drive.
> Radio shack jumpered all drive selects on on the driv
I have a operational P112 with 3.5" floppies, GIDE/CF and CD-ROM. Do you know
which ROM you have installed?
On 04/08/2018 02:11 PM, Fred Cisin wrote:
I do have to admit that I find it hard to believe that the cable to
the
floppy can actually make a difference.
>>> A minor point, . . .
>>> On 5150/5160/5170, the SECOND drive is a straight cable, FIRST drive
>>> is crossed. Thus, drive A
> I see one about partitioning but not sure how one gets the FDISK
> utility onto a bootable P112 floppy.
The cpmtools has a diskdef for the p112 formats. One could therefore
copy from images to actual floppies, assuming the needed hardware can be
coaxed into connectivity with a suppor
I do have to admit that I find it hard to believe that the cable to the
floppy can actually make a difference.
A minor point, . . .
On 5150/5160/5170, the SECOND drive is a straight cable, FIRST drive
is crossed. Thus, drive A: is at the end of the cable, B: is in the
middle of the cable.
On S
0, the SECOND drive is a straight cable, FIRST drive
> is crossed. Thus, drive A: is at the end of the cable, B: is in the
> middle of the cable.
Yeah, knew that from other systems. IBM really screwed that up.
Should have left it the way it was and have people set the Drive Select
themselves
end of the cable, B: is in the middle
of the cable.
The P112 manual
https://661.org/p112/files/p112-doc.pdf Page 10
calls for the reverse, with FIRST drive before the twist, SECOND drive
after the twist.
IF that is correct, then your first drie is straight through. That also
means that an
oo short.
>
> Does either of these sites have any of what you need in terms of
> software?
>
> http://p112.sourceforge.net/index.php?downloads
> http://stack180.com/P112%20Downloads.htm
Got both of them.
Anybody have any step by step instructions for intalling OSes
to an IDE on th
> there. I read somewhere that there is a copy on the CD. I wonder
> where that might be? :-)
The random failure thing makes me wonder about some floppy timing
parameter being just-almost too short.
Does either of these sites have any of what you need in terms of
software?
http://p1
Success!!! Up to a point.
I have it booting on a floppy. I have confirmed that you can,
apparently, not make disk images with an external USB Floppy
drive.
I am going to go back now and retest a bunch of the floppy drives
and cables to see if there really is a problem or if it was just the
i
Some more data points.
I have tried four different floppy cables and 6 different floppy
drives (different brands, as well).
I had one combination where it actually booted the P112/GIDE
floppy. Got sector read errors. But wait, it gets better. I rebooted
about a half dozen times. The
On 04/08/2018 06:12 AM, Torfinn Ingolfsen via cctalk wrote:
> I have a P112 (bought as a kit) which I have assembled and plyed with a bit.
> Your description doesn't mention it, so we need more details:
> - did you build the P112 yourself, or did it come pre-assembled?
Bought it
I have a P112 (bought as a kit) which I have assembled and plyed with a bit.
Your description doesn't mention it, so we need more details:
- did you build the P112 yourself, or did it come pre-assembled?
- has it been working before? Or is this your first time trying it?
- which version of th
It's not really Classic Hardware, but it does run some pretty classic
OSes. Anybody here working with the P112? I have had a couple for
ages but never had time to play with them. I see them now as a
possible way to manipulate floppies (including 8") from classic systems
so I
k@classiccmp.org> wrote:
> I want one... Full kit preferred.
>
> --frax
>
> On Wed, Jul 26, 2017 at 10:35 AM, David Griffith via cctalk <
> cctalk@classiccmp.org> wrote:
>
> >
> > I've sold the last of my P112 boards. Is there still any interest in
>
I want one... Full kit preferred.
--frax
On Wed, Jul 26, 2017 at 10:35 AM, David Griffith via cctalk <
cctalk@classiccmp.org> wrote:
>
> I've sold the last of my P112 boards. Is there still any interest in P112
> kits or boards?
>
> --
> David Griffith
> d...
I've sold the last of my P112 boards. Is there still any interest in P112
kits or boards?
--
David Griffith
d...@661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
FYI, I still have lots of P112 CP/M computer kits for sale. Please buy
one or several. See http://661.org/p112/
--
David Griffith
d...@661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most
I have two more P112 kits left. One is a board with parts. The other
adds an old SCSI enclosure. Once these are gone, it'll be a long time
before I offer complete kits again. The price is $190 for the kit alone
and $210 for the kit with chassis (shipped in the US). The chass
90 matches
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