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An example session - continued from SDK-85 fun - part 3
If MAME/MESS64 is used, press space twice to get over intro screen! Other steps are same in both virtual or baremetal environments.
Below is the sdk85's greetings, "POST screen" meaning evboard is okay and ready to use.
The stack pointer and program counter MUST have been initialized before work! Let's assign values 20C2H and 0800H to SP and PC respectively:
Examine registers:
Jump through F register:
Jump through again:
And again:
Still not stack pointer:
At least!
Now PC register is set:
Pressing "Next" finishes examining CPU registers, then "Go" and "Exec" should have been pressed in order to boot secondary rom bank:
Till this, every steps are the same regardless of the contents of the custom rom bank, entry points - PC values may vary.
"0" to press in order to start a new game
First 3 guesses are cut, just 2 finals were kept before winning the game. Next-to-last try is "5 6 2 1"
"Two bulls one cow" :-) Two black sticks and one white:
"6 4 2 1" succeeded!
Machine celebrates winner blinking seven segment LED display:
Button "3" must be pressed in order to continue and show number of tries:
Pressing zero restarts the game:
Have fun!
MAME developers silently(?) changed the keyboard mapping in sdk85. For the curious a rosetta table is below, the latest valid mappings are in sdk85.cpp in MAME's source repository.
| MCS-85 | Old mapping | New mapping |
|---|---|---|
| 0 | 0 | 0 |
| 1 | 1 | 1 |
| 2 | 2 | 2 |
| 3 I | 3 | 3 |
| 4 SPH | 4 | 4 |
| 5 SPL | 5 | 5 |
| 6 PCH | 6 | 6 |
| 7 PCL | 7 | 7 |
| 8 H | 8 | 8 |
| 9 L | 9 | 9 |
| A | A | A |
| B | B | B |
| C | C | C |
| D | D | D |
| E | E | E |
| F | F | F |
| Exec | Q | . |
| Go | R | G |
| Next | Up | , |
| Exam | Y | X |
| Subst | T | S |
| Single | U | / |
Apologies about the screenshots: it was a bit new to us (or just forgotten decades ago) that 4-5-6-7 buttons are shortcuts for SP and PC when examining registers!
According to our knowledge, there is no official working MCS-85 secondary rom bank support in MAME, hopefully it will change in the near future!
Have fun!
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