48 lines
1001 B
ArmAsm
48 lines
1001 B
ArmAsm
;; #LAYOUT# STD * #TAKE
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;; #LAYOUT# * KERNAL_0 #TAKE
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;; #LAYOUT# * * #IGNORE
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default_brk_handler:
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; Implemented according to Computes Mapping the Commodore 64, pages 73-74
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sei ; disable IRQs, to be sure they wont interfere
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!ifdef CONFIG_PLATFORM_COMMODORE_64 {
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ldx #$00
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sta VIC_SCROLX ; turn the display off - we want as little screen artifacts as possible
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}
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cld ; make sure this dangerous flag is disabled
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!ifdef HAS_OPCODES_65CE02 {
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see ; disable extended stack
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}
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!ifdef CONFIG_MB_M65 {
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; Make sure we have normal memory mapping
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jsr map_NORMAL
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lda VIC_CTRLA
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and #%01000111
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sta VIC_CTRLA
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}
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jsr JRESTOR
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jsr JIOINIT
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; Original routine calls just a part of CINT - but I am not sure which one. Most likely it
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; skips the PAL/NTSC check by calling $E518. I suspect bug in the original ROM, lets
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; call the whole CINT, just to be sure everything is initialized.
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jsr CINT
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cli
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jmp (IBASIC_WARM_START)
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