Alexandre Souza wrote:
Here is a
picture of the machine you are connecting to, complete with
the Western Digital 8003 Ethernet card grafted onto the side:
http://brutman.com/PCjr_WD_small.jpg
Nice!
Glad you like it!
A few years ago I did a pin-to-pin mapping from the Jr's bus to ISA.
Except for DMA and some IRQs, it's doable.
The particular adapter that I'm using is a commercial product from the
mid 80s. I know of somebody who designed their own version of it and is
running an XT hard disk controller with a modified BIOS on their Jr.
Cards that do not use DMA and makes limited use of IRQs are candidates
for running on the machine. Conflicts with built-in hardware have to be
avoided as well, as the onboard diskette and serial ports can't be
disabled without a wire cutters.
I've run that Western Digital 8003, a 3Com 3C503, an NE1000, a Trantor
T130 SCSI card, and a Future Domain 85x variant in the adapter. One day
I'll figure out how to rework the BIOS on the Future Domain cards so
that I can get the machine to boot from the hard disk.
Mike