I just looked at my files for the extended 8085. They are all dated
April 2012! Has it really been 4 years since I worked on that stuff?
Man time sure does fly by.
Anyway, I saw that I also remapped the RSTV opcode since it is basically
useless in the M100 ROM, and I also have extended opcodes for LJMP and
LCALL (24-bit JMP and CALL).
That project was built around an Actel IGLOO chip (sitting on a board
with limited peripherals). I should dust off that project and get it
running on my Digilent NEXYS 4 or Zedboard board.
Ken
On 5/2/16 3:18 PM, John R. Hogerhuis wrote:
On Mon, May 2, 2016 at 3:01 PM, Ken Pettit <petti...@gmail.com
<mailto:petti...@gmail.com>> 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.
