Sega 32X Handbuch Seite 89

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Seitenansicht 88
89
1.16. Master Boot ROM
org $0
* VBR
dc.l reset ; 0: POWER ON RESET PC
dc.l 0x06040000 ; 1: POWER ON RESER SP
dc.l reset ; 2: MANUAL RESET PC
dc.l 0x06040000 ; 3: MANUAL RESET SP
dc.l forever ; 4: GENERAL ILLEGAL INSTRUCTION
dc.l 0x00000000 ; 5: SEGA RESERVED
dc.l forever ; 6: SLOT ILLEGAL INSTRUCTION
dc.l 0x20100400 ; 7: SEGA RESERVED
dc.l 0x20100420 ; 8: SEGA RESERVED
dc.l forever ; CPU ADDRESS ERROR
dc.l forever ; DMA ADDRESS ERROR
dc.l forever ; NMI INTERRUPT
dc.l forever ; USER BREAK INTERRUPT
org $34
* 76 bytes, SEGA Reserved
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
dc.l 0
org $80
* CPU Traps
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
org $100
* INT
dc.l forever,forever,forever,forever
dc.l forever,forever,forever,forever
org $120
* Peripherals
dc.l forever,forever,forever,forever
dc.l forever,forever,forever
org $13C
forever:
0x0000013C: 0xAFFE bra 0x0000013C
0x0000013E: 0x0009 nop
org $140
reset:
0x00000140: 0xD01A mov.l @(0x06C, pc), r0 ; @0x000001AC = $000000F0
0x00000142: 0x400E ldc r0, sr ; Set Interrupt Mask Bits
Seitenansicht 88
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