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Code snippet for the ITI

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This commit is contained in:
Angelo Salese 2013-02-21 20:49:26 +00:00
parent 3bb2d1ee66
commit eb23009535
1 changed files with 15 additions and 1 deletions
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16
src/mame/drivers/coolridr.c
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@ -2495,7 +2495,21 @@ TODO: both irq routines writes 1 to 0x60d8894, sets up the Watchdog timer then e
vector is 0x7f (so VBR+0x1fc)
level is 0xf
... and indeed the Watchdog irq routine effectively clears this RAM buffer. What the manual doesn't say is that the Watchdog timer irq
presumably is an NMI if this is even possible ...
presumably is treated as an NMI by the SH-2 CPU and not really a "normal" irq exception.
For the record, here's the ITI code snippet:
06002DE4: 2F36 MOV.L R3,@-SP
06002DE6: E300 MOV #$00,R3
06002DE8: 2F26 MOV.L R2,@-SP
06002DEA: D20B MOV.L @($2C,PC),R2
06002DEC: 2230 MOV.B R3,@R2 ;writes 0 to the RAM buffer 0x60d8896
06002DEE: 9305 MOV.W @($000A,PC),R3
06002DF0: 9205 MOV.W @($000A,PC),R2
06002DF2: 2231 MOV.W R3,@R2 ;writes 0x19, disables the watchdog timer
06002DF4: 62F6 MOV.L @SP+,R2
06002DF6: 63F6 MOV.L @SP+,R3
06002DF8: 002B RTE
06002DFA: 0009 NOP
*/
READ32_MEMBER(coolridr_state::coolridr_hack2_r)
{