[GreenKeys] SWTPC 6800

[Chris Elmquist]

My standard test program…

At $0100,

86 00 BD E1 D1 7C 01 01 7E 01 00

Barber pole terminal test if you have MIKBUG or SWTBUG.  Self modifying too!  😝

The good ‘ol days.

Chris
--
Chris Elmquist

> On Jul 21, 2022, at 6:30 PM, Harold Hallikainen via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> 
>> I too programmed the 6800 directly in machine code from memory (to
>> memory? LOL) especially with the MEK6800-D1 board.  Then I learned what
>> you could do with an assembler... and then a macro assembler... and
>> didn't really look back until debugging time.
>> 
>> Chris NØJCF
>> 
>> --
>> Chris Elmquist
> 
> I still remember 0x7e for jump, 0xbd for call, 0x3f for SWI. Also, I
> learned to count forwards and backwards for branch instructions.
> 
> Fun stuff!
> 
> Harold
> https://w6iwi.org
> 
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