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Jeff Parsons 2017-08-23 20:20:17 -07:00 • committed by Jeff Parsons
commit 73bcb543fd
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6
devices/pcx86/rom/compaq/deskpro386/README.md
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@ -10,7 +10,7 @@ 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.
[<img src="http://archive.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://archive.pcjs.org/pubs/pc/reference/compaq/images/Compaq_DeskPro_386-16_System_Board_V2.jpg)
[<img src="https://s3-us-west-2.amazonaws.com/archive.pcjs.org/pubs/pc/reference/compaq/images/Compaq_DeskPro_386-16_System_Board_V2-640.jpg" alt="Compaq DeskPro 386 System Board Version 2"/>](https://s3-us-west-2.amazonaws.com/archive.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.
@ -65,9 +65,9 @@ Arduino-compatible prototyping board, and capturing the serial port output on my
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](http://archive.pcjs.org/pubs/pc/datasheets/27128A.pdf) datasheet -- the closest match I could find online.
[27128A](https://s3-us-west-2.amazonaws.com/archive.pcjs.org/pubs/pc/datasheets/27128A.pdf) datasheet -- the closest match I could find online.
![<img src="http://archive.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://archive.pcjs.org/pubs/pc/reference/compaq/images/Compaq_DeskPro_386-16_System_ROM_V2_Breadboard.jpg)
![<img src="https://s3-us-west-2.amazonaws.com/archive.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"/>](https://s3-us-west-2.amazonaws.com/archive.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