[LMH]Diagnostic Engine Code again

[Nyef]

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--8323328-1581355948-1062638176=:17823
Content-Type: TEXT/PLAIN; charset=US-ASCII

Hello all.

On monday evening I was looking through hexdumps of disk images for no 
real reason, and I stumbled upon something interesting in explScsi0Dr1.dsk 
at offset #x49c10: An opcode list for Diagnostic Engine Code.

Attached is the source code for a Diagnostic Engine Code disassembler. It 
make need some tweaking in order to work (a couple includes are probably 
wrong for your systems, and you may need some typedefs), but works fine 
over here.

A couple sample command lines:

./disdec aek/E1_eproms/2236662_SIB 0x0e 0x0c 0xf8

./disdec aek/explorerI_diskDumps/explScsi0Dr1.dsk 0x4b134 0x1534 0x100

Unfortunately, while I turned up an opcode list, it didn't include such 
niceties as full instruction encoding information or desciptions of 
instruction semantics. Some parts of the disassembler code are educated 
guesses that held up in practice. Some parts are completely untested (due 
mainly to not having any code that triggers them handy).

Anyway, that's what I've been messing with for the past couple days.

---------------------------
All programming can be viewed as an exercise.
---------------------------
Alastair Bridgewater
e-mail: nyef@softhome.net
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