PC104 bus 80386SX CPU

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I bought this because it is in a convenient Eurocard format, and is fully documented with a manual and a circuit diagram.

Keith

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05/10/2024 at 21:19 • 0 comments
IC 2 M27C1001 labelled AR8000-00135-008-104

This is an 128K x 8-bit EPROM.

The data appears very sparse, to say the least.
```
00000 to 01fff: all FF
02000 66 23 80 3f 66 3c 41 3f
02008 to 1ffff: all zero
```
which disassembles to this
```
0:  66 23 80 3f 66 3c 41    and    ax,WORD PTR [eax+0x413c663f]
7:  3f                      aas
```
which does not look like useful code.
I think it is two little-endian 32-bit vectors:
```
3f802366
3f413c66
```
Underneath the board are two Intel E28F008S5 surface-mounted flash ROM chips. That is 2 Mbytes total enough to store the ROM-based DOS. I will have to read them when I have the board up and running.