Mac GUI

A V2 version of the S100 bus MSDOS Support board.

comp.os.cpm

Author: monahan9999
Date: 26 Feb 2014 7:12 pm

Back over 2 years ago Andrew and I put together an S100 bus "MSDOS Support board". This board was designed to allow one to run Microsoft's MSDOS (V4.10) right out of the box utilizing common hardware/configuration etc. found in a PC and our 8088/8086/80286 family of CPU boards.  While the board is called an "MSDOS support board", it can be used for CPM and CPM86 as well.

The board has proven to be very popular and reliable. Over 20 boards were already made and distributed to users. I decided to add a few small changes to the board to improve its functionality. We are calling this board the "V2-MSDOS Support Board". The changes include:-

1. Add a HolTek HT6542 PC keyboard controller chip to allow a MSDOS keyboard and mouse connection  

2. Replace the RTC with a chip that utilizes a separate battery for future replacements/availability  

3. Optimize the board layout and traces so the overall lengths are shorter and more reliable

4. Remove the S100 bus extra wait state circuit  

5. Label the board jumper options on the board better.

A brief description of the V2 board can be found here:-

http://s100computers.com/My%20System...20Board.htm#V2 MS_DOS Support

(Bottom of the page).

There is now a ground swell of people wanting to get an early version of this board. Please look at the N8VEM Google Groups for more info
https://groups.google.com/forum/?fro...rum/n8vem-s100

John




A V2 version of the S100 bus MSDOS Support board.
126 Feb 2014 7:12 pmmonahan9999
226 Feb 2014 11:04 pm|- Steve Nickolas
327 Feb 2014 1:10 am\ monahan9999