127 lines
2.6 KiB
ArmAsm
127 lines
2.6 KiB
ArmAsm
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;===================================================================
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; code to patch mockingboard if not in slot#4
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;===================================================================
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; this is the brute force version, we have to patch 39 locations
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; see further below if you want to try a smaller, more dangerous, patch
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mockingboard_patch:
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lda MB_ADDR_H
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sta pt3_irq_smc1+2 ; 1 *
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sta pt3_irq_smc2+2 ; 2 *
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sta pt3_irq_smc2+5 ; 3 *
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sta pt3_irq_smc3+2 ; 4 *
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sta pt3_irq_smc3+5 ; 5 *
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sta pt3_irq_smc4+2 ; 6 *
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sta pt3_irq_smc4+5 ; 7 *
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sta pt3_irq_smc5+2 ; 8 *
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sta pt3_irq_smc5+5 ; 9 *
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sta pt3_irq_smc6+2 ; 10 *
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sta pt3_irq_smc6+5 ; 11 *
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sta pt3_irq_smc7+2 ; 12 *
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sta pt3_irq_smc7+5 ; 13 *
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sta mock_init_smc1+2 ; 14 *
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sta mock_init_smc1+5 ; 15 *
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sta mock_init_smc2+2 ; 16 *
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sta mock_init_smc2+5 ; 17 *
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sta reset_ay_smc1+2 ; 18 *
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sta reset_ay_smc2+2 ; 19 *
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sta reset_ay_smc3+2 ; 20 *
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sta reset_ay_smc4+2 ; 21 *
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sta write_ay_smc1+2 ; 22 *
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sta write_ay_smc1+5 ; 23 *
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sta write_ay_smc2+2 ; 24 *
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sta write_ay_smc2+5 ; 25 *
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sta write_ay_smc3+2 ; 26 *
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sta write_ay_smc3+5 ; 27 *
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sta write_ay_smc4+2 ; 28 *
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sta write_ay_smc4+5 ; 29 *
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sta write_ay_smc5+2 ; 30 *
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sta write_ay_smc5+5 ; 31 *
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sta write_ay_smc6+2 ; 32 *
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sta write_ay_smc6+5 ; 33 *
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sta setup_irq_smc1+2 ; 34 *
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sta setup_irq_smc2+2 ; 35 *
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sta setup_irq_smc3+2 ; 36 *
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sta setup_irq_smc4+2 ; 37 *
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sta setup_irq_smc5+2 ; 38 *
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sta setup_irq_smc6+2 ; 39 *
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sta disable_irq_smc1+2 ; 40 *
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sta disable_irq_smc2+2 ; 41 *
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rts
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.if 0
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;===================================================================
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; dangerous code to patch mockingboard if not in slot#4
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;===================================================================
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; this code patches any $C4 value to the proper slot# if not slot4
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; this can be dangerous, it might over-write other important values
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; that should be $C4
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; safer ways to do this:
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; only do this if 2 bytes after a LDA/STA/LDX/STX
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; count total and if not 39 then print error message
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mockingboard_patch:
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; from mockingboard_init $1BBF
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; to done_pt3_irq_handler $1D85
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ldx MB_ADDR_H
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ldy #0
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lda #<mockingboard_init
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sta MB_ADDR_L
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lda #>mockingboard_init
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sta MB_ADDR_H
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mb_patch_loop:
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lda (MB_ADDR_L),Y
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cmp #$C4
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bne mb_patch_nomatch
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txa
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sta (MB_ADDR_L),Y
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mb_patch_nomatch:
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; 16-bit increment
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inc MB_ADDR_L
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bne mb_patch_oflo
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inc MB_ADDR_H
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mb_patch_oflo:
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lda MB_ADDR_H
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cmp #>done_pt3_irq_handler
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bne mb_patch_loop
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lda MB_ADDR_L
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cmp #<done_pt3_irq_handler
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bne mb_patch_loop
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mb_patch_done:
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stx MB_ADDR_H ; restore slot for later
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rts
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.endif
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