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Improved note, nw

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Angelo Salese 2014-11-20 01:01:15 +01:00
parent 01dc9b6434
commit 98f29dc4a7
1 changed files with 8 additions and 4 deletions
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12
src/mame/drivers/alinvade.c
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@ -6,10 +6,14 @@
TODO:
- 16 bytes are protected in the c*** range. I'm guessing they used a PROM to protect a
simple sub-routine because just after that the program has a left-over located at 0xe000-0xe00f (yup, NOPs + a RTS)
It's unknown at current stage what it really protects tho ...
Sound is entirely guesswork.
simple sub-routine because:
* It attempts to jsr from RAM to that area with a 0x10 byte offset (i.e. ROM copies a code snippet to RAM; when it executes
it code executes jsr 0xc400 then self-modifies it to 0xc410, rinse and repeat ... up to 0xc7f0 and rolls back);
* After that the program has an amusing left-over located at 0xe000-0xe00f (yup, NOPs + a RTS), with the
exact same number of times as above;
It's unknown at current stage what it really protects tho, game seems working for all I can see ... -AS
- Sound is entirely guesswork.
*/