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Finished porting the blog posts

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Jeff Parsons 2015-12-10 23:41:59 -08:00
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16
devices/pc/bios/compaq/deskpro386/README.md
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@ -1,9 +1,15 @@
---
layout: page
title: Compaq DeskPro 386 ROMs
permalink: /devices/pc/bios/compaq/deskpro386/
---
Compaq DeskPro 386 ROMs
---
The oldest Compaq DeskPro 386 ROM I have is a Rev J.4 ROM from a "Version 2" motherboard designed
in 1987 and released in 1988.
![Compaq DeskPro 386 System Board Version 2](/pubs/pc/reference/compaq/static/images/Compaq_DeskPro_386-16_System_Board_V2-640.jpg "link:/pubs/pc/reference/compaq/static/images/Compaq_DeskPro_386-16_System_Board_V2.jpg")
[<img src="http://static.pcjs.org/pubs/pc/reference/compaq/images/Compaq_DeskPro_386-16_System_Board_V2-640.jpg" alt="Compaq DeskPro 386 System Board Version 2"/>](http://static.pcjs.org/pubs/pc/reference/compaq/images/Compaq_DeskPro_386-16_System_Board_V2.jpg)
Thanks to folks on the [Vintage Computer](http://www.vintage-computer.com/) forums, I also have a Rev N.1 ROM from 1989.
@ -39,9 +45,9 @@ For a more human-readable dump, use the `--comments` option:
And for those who want a binary file, the FileDump API can be used to recreate binary data from JSON data:
> [http://www.pcjs.org/api/v1/dump?file=http://www.pcjs.org/devices/pc/bios/compaq/deskpro386/1988-01-28/1988-01-28.json&format=rom](http://www.pcjs.org/api/v1/dump?file=http://www.pcjs.org/devices/pc/bios/compaq/deskpro386/1988-01-28/1988-01-28.json&format=rom)
http://localhost:8088/api/v1/dump?file=http://localhost:8088/devices/pc/bios/compaq/deskpro386/1988-01-28/1988-01-28.json&format=rom
Similarly, [1989-04-14.json](1989-04-14/1989-04-14.json) was generated by first creating [1989-04-14.rom](http://www.pcjs.org/api/v1/dump?file=http://www.pcjs.org/devices/pc/bios/compaq/deskpro386/1989-04-14/1989-04-14.json&format=rom)
Similarly, [1989-04-14.json](1989-04-14/1989-04-14.json) was generated by first creating **1989-04-14.rom**
from the two 16Kb BIN files provided by [Al Kossow](http://www.vintage-computer.com/vcforum/member.php?2256-Al-Kossow):
cd 1989-04-14
@ -56,10 +62,10 @@ prototyping board, and capturing the serial port output on my MacBook Pro -- as
"[Stick a Straw in Its Brain and Suck: How to Read a ROM](http://www.nycresistor.com/2012/07/07/stick-a-straw-in-its-brain-and-suck-how-to-read-a-rom/)"
by [NYC Resistor](http://www.nycresistor.com/) contributor [phooky](http://www.nycresistor.com/author/phooky/).
The DeskPro 386 ROMs were P27128A-2 chips, so I wired my Uno32 based on this [27128A](/pubs/pc/datasheets/static/27128A.pdf)
The DeskPro 386 ROMs were P27128A-2 chips, so I wired my Uno32 based on this [27128A](http://static.pcjs.org/pubs/pc/datasheets/27128A.pdf)
datasheet -- the closest match I could find online.
![Compaq DeskPro 386 System ROM Version 2](/pubs/pc/reference/compaq/static/images/Compaq_DeskPro_386-16_System_ROM_V2_Breadboard-640.jpg "link:/pubs/pc/reference/compaq/static/images/Compaq_DeskPro_386-16_System_ROM_V2_Breadboard.jpg")
![<img src="http://static.pcjs.org/pubs/pc/reference/compaq/images/Compaq_DeskPro_386-16_System_ROM_V2_Breadboard-640.jpg" alt="Compaq DeskPro 386 System ROM Version 2"/>](http://static.pcjs.org/pubs/pc/reference/compaq/images/Compaq_DeskPro_386-16_System_ROM_V2_Breadboard.jpg)
On my first dump attempt, every ROM address returned 0xFF. After looking at the 27128A datasheet more closely, I noticed
the DEVICE OPERATION table indicated that, for a READ operation, /CE and /OE pins should be connected to INPUT LOW VOLTAGE,