Re: [M100] My 100's display PCB

[Kevin Arndt]

Have you been able to source M11/M12, the HD44103BLD?  I'm also in need of one 
to fix my M102.
Thanks,
Kevin

-Original Message-
From: M100  On Behalf Of me
Sent: Thursday, April 30, 2020 6:56 PM
To: m100@lists.bitchin100.com
Subject: [M100] My 100's display PCB


Hi folks,

Ian was kind enough to take a stab at repairing my display PCB. It appears to 
be the M11 44103

chip. By chance, would anyone happen to have the part spare sitting around 
they'd be willing to sell me?

D

Re: [M100] NEC PC-8231A on eBay

[John R. Hogerhuis]

On Wed, May 27, 2020 at 3:18 PM Chris Fezzler  wrote:

> Interesting John.  Can you tell me more about that mode?  OS runs on the
> disk drive leaving all PC-8500 ram for program?
>
>
Right, normally the machine is in a ROM/RAM mode like the Model T's running
a ROM'd CP/M. But if you have the boot disk (I think I do) and the 8431A
disk drive (I don't) for the NEC-PC-8500 it should be able to boot into
full 64K RAM CP/M mode.

Which would improve compatibility with typical Z80 CP/M software.

-- John.

Re: [M100] NEC PC-8231A on eBay

[Chris Fezzler]

 Interesting John.  Can you tell me more about that mode?  OS runs on the disk 
drive leaving all PC-8500 ram for program?
On Wednesday, May 27, 2020, 05:16:57 PM EDT, John R. Hogerhuis 
 wrote:  
 
 That is rare!

I was looking for the 8431A at one time because the PC-8500 needs it to boot 
into all-RAM CP/M mode. Gave up.

-- John.  

Re: [M100] NEC PC-8231A on eBay

[Peter Vollan]

$200 is a bit much considering that it is untested and has pieces broken off

On Wed, 27 May 2020 at 14:16, John R. Hogerhuis  wrote:
>
> That is rare!
>
> I was looking for the 8431A at one time because the PC-8500 needs it to boot 
> into all-RAM CP/M mode. Gave up.
>
> -- John.

Re: [M100] NEC PC-8231A on eBay

[John R. Hogerhuis]

That is rare!

I was looking for the 8431A at one time because the PC-8500 needs it to
boot into all-RAM CP/M mode. Gave up.

-- John.

Re: [M100] M100 Digest, Vol 113, Issue 21

[John Ames]

(Apologies, I forgot that GMail's in-message reply box does that invisibly...)

[M100] NEC PC-8231A on eBay

[Matt Jenny]

One was posted today. It is listed as as-is/untested with a broken clip.
Seller is asking $199 for it. I bet someone on this list will be looking
for one.

https://www.ebay.com/itm/333608993347

Re: [M100] M100 Digest, Vol 113, Issue 20

[Gregory McGill]

Please don't quote the entire message base when posting a 1 line reply ;)


On Wed, May 27, 2020 at 9:46 AM John Ames  wrote:

> *quietly snags the M100SIG archive from archive.org*
>
> On 5/26/20, m100-requ...@lists.bitchin100.com
>  wrote:
> > Send M100 mailing list submissions to
>

SNIP

Re: [M100] M100 Digest, Vol 113, Issue 20

[John Ames]

*quietly snags the M100SIG archive from archive.org*

On 5/26/20, m100-requ...@lists.bitchin100.com
 wrote:
> Send M100 mailing list submissions to
>   m100@lists.bitchin100.com
>
> To subscribe or unsubscribe via the World Wide Web, visit
>   http://lists.bitchin100.com/listinfo.cgi/m100-bitchin100.com
> or, via email, send a message with subject or body 'help' to
>   m100-requ...@lists.bitchin100.com
>
> You can reach the person managing the list at
>   m100-ow...@lists.bitchin100.com
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of M100 digest..."
>
>
> Today's Topics:
>
>1. Re: Undocumented hardware (John R. Hogerhuis)
>2. Re: Undocumented hardware (John R. Hogerhuis)
>3. Re: Undocumented hardware (Philip Avery)
>4. Re: Undocumented hardware (John R. Hogerhuis)
>5. Othello for model 100 (Alain Dextraze)
>6. Re: Othello for model 100 (John R. Hogerhuis)
>7. Re: Othello for model 100 (Mike Stein)
>8. Re: Undocumented hardware (B 9)
>9. Re: Undocumented hardware (Brian K. White)
>   10. Re: Undocumented hardware (Stephen Adolph)
>   11. Re: Undocumented hardware (Tom Dison)
>   12. Re: Undocumented hardware (Stephen Adolph)
>   13. Re: Undocumented hardware (Brian K. White)
>   14. Re: Undocumented hardware (Stephen Adolph)
>   15. Re: Undocumented hardware (Stephen Adolph)
>   16. Re: Undocumented hardware (Tom Dison)
>   17. Re: Undocumented hardware (Brian K. White)
>   18. Re: Undocumented hardware (Tom Wilson)
>   19. Re: Undocumented hardware (Tom Dison)
>   20. Re: Undocumented hardware (Brian K. White)
>   21. Re: Undocumented hardware (Tom Dison)
>   22. Re: Undocumented hardware (Brian K. White)
>   23. Re: Undocumented hardware (Stephen Adolph)
>   24. Re: Undocumented hardware (Tom Wilson)
>   25. Re: Undocumented hardware (Stephen Adolph)
>   26. Re: Undocumented hardware (Mike Stein)
>   27. Re: Undocumented hardware (Mike Stein)
>   28. Re: Undocumented hardware (Tom Dison)
>   29. Re: Undocumented hardware (Tom Wilson)
>   30. Re: Undocumented hardware (Stephen Adolph)
>   31. Re: Undocumented hardware (Mike Stein)
>   32. Re: Undocumented hardware (Brian K. White)
>   33. Re: "No-VAN" obligation (Brian K. White)
>   34. Re: Undocumented hardware (Mike Stein)
>   35. Re: "No-VAN" obligation (Stephen Adolph)
>   36. Re: Undocumented hardware (Brian K. White)
>   37. Re: "No-VAN" obligation (Brian K. White)
>   38. Re: Undocumented hardware (Mike Stein)
>   39. Re: Undocumented hardware (Brian K. White)
>   40. Reuse of laddie (John R. Hogerhuis)
>   41. Re: Reuse of laddie (Tom Dison)
>   42. The Dead Hand (John R. Hogerhuis)
>
>
> --
>
> Message: 1
> Date: Mon, 25 May 2020 15:32:28 -0700
> From: "John R. Hogerhuis" 
> To: m...@bitchin100.com
> Subject: Re: [M100] Undocumented hardware
> Message-ID:
>   
> Content-Type: text/plain; charset="utf-8"
>
> On Mon, May 25, 2020 at 1:05 AM B 9  wrote:
>
>> From: "John R. Hogerhuis" 
>>> To: m...@bitchin100.com
>>>
>>> Yes the Model T screen driver is slow. It's possible we could speed it
>>> up
>>> a little because there is some hardware scrolling capability built into
>>> the
>>> video chip drivers that the ROM does not make use of.
>>>
>>> But that would
>>> a) Require creating code in option rom or in RAM to do all character
>>> generation
>>>
>>
>> Are you sure that's required? The demos I found don't seem to be doing
>> that.
>>
>>
>
> It's complicated. There's a lot of ROM code you can leverage for sure.
>
>
>> b) It's not clear how much the speed-up would be.
>>>
>>
>> One demo, by Philip Avery, claims over 10x speed acceleration using
>> hardware scrolling. According to Hidden Powers of the Model 100
>> ,
>> the screen can only show 90 characters per second with a maximum download
>> speed to RAM of 240 cps. My own tests with scrolling speed in TELCOM is
>> that I can get about 1KB in 6 seconds (170 cps) if the screen has to
>> scroll
>> during download, but I save about a second per kilobyte (200 cps) if I
>> disable screen scrolling but still send characters to the screen. Of
>> course, this is with software flow control, so that may be an additional
>> bottleneck.
>>
>> It's strange and fascinating that the Model T had hardware scrolling
>> acceleration it never used. Do you have a link for more information about
>> it? I tried googling and all I came up with was:
>>
>>
>> http://www.club100.org/memfiles/index.php?action=view=LCDTST.DO=Steve%20Adolph
>> and
>>
>> http://www.club100.org/memfiles/index.php?=1=nom=Philip%20Avery/Hardware%20Scroll
>>
>>
> http://bitchin100.com/wiki/index.php?title=Model_100_LCD_Programming
> https://bitchin100.com/files/hardware/HD44102.PDF
> https://bitchin100.com/files/hardware/lcd.pdf
>
>
>
>> Neither one worked on my Model 200, but I don't know if it's a 

Re: [M100] New Toy

[Josh Malone]

Nice! It's not quite as old-skool, but I love the Xeltek SP280U that I
"stumbled into" as well. Old enough to handle 21-volt EPROMs like 2732,
etc. but new enough to work with Windows 10 (as long as you're willing to
use a slightly-hacked driver :)

On Wed, May 27, 2020 at 2:44 AM Kurt McCullum  wrote:

> It's not often you stumble on a piece of retro equipment that truly is
> "New in the box" as listed. But I just had that happen. Picked up an ART
> EPP-1F EPROM programmer still sealed in the original plastic. Same as Rick
> used in the pictures on the Club100 romware page. Works perfectly reading
> and writing EPROMs for my NEC 8201s. I've been meaning to get one of these
> rather than send out to have my code burned by someone else. Sure there are
> plenty of newer options out there, but the old-school feel is priceless.
>
> Kurt
>