Thanks! Not that I've seen, and I have the M100 ROM about 50% commented
at this point (as you already know).
But even if they did, it would only be one or two places, and those
could be worked around. I already had to make changes to the ROM for
the ISR routines to perform a LRET (long return) anyway.
Not only do I have Verilog code for the extended 8085, I also have the
LCD controllers, Clock chip, a keyboard scanner, 8155, UART, RAM and a
SPI interface. Plus a top level wrapper that pulls it together as a
system (currently that file is called model401.v in my RTL directory).
Ken
On 5/2/16 3:18 PM, John R. Hogerhuis wrote:
On Mon, May 2, 2016 at 3:01 PM, Ken Pettit <[email protected]
<mailto:[email protected]>> wrote:
I used the MOV A,A MOV B,B, MOV C,C, etc. opcodes and remaped them.
Clever! As you know though there's all kinds of strange code in the
ROM used in "byte fighter" techniques where the programmer coded a
jump into the middle of an instruction effectively creating multiple
entry points into the same instruction with different outcomes
depending on the entry point. Did Bill ever use those opcodes as
"special no-ops"?
-- John.
