Re: Mockingboard sound and Pitfall II

Linards Ticmanis wrote:
Michael wrote:

Was there a comprehensive (ok, so maybe 20 isn't a lot :-) of all the
games that supported the mockingboard?

G.I. Joe - A Real American Hero

The version I downloaded from Asimov doesn't have any MB support,
AFAICT.

Linards:
1) Try in Apple][+ mode and set the debugger to break on invalid
opcodes. Hit space when the crack screen comes up and the debugger will
break here:
D422: 2F rla $0FC9
Exit debugger and the game loads.

2) Try in Apple//e mode (hit space) and the debugger break here:
D422: 2F nop
Exit debugger (and remove "break on invalid-1") and the game just hangs
in the disk load routines

So, this game works fine on a 6502, but not on a 65C02.
Is this a dodgy image, dodgy crack or poor original implementation?
(I'm assuming your CPU emulation is fine... it looks OK :)

Interestingly this game works on a //GS (under KEGS), probably as
opcode $2F (luckily) maps to an opcode that behaves like the 6502.

Tom

.

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