mirror of https://github.com/mgcaret/rom4x.git
14 lines
431 B
ArmAsm
14 lines
431 B
ArmAsm
; Patch the Apple IIc+ diagnostics to skip the ROM checksum test.
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; We should really examine the routine at $D249 in the aux firmware
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; to see if we can calculate a new checksum.
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; the $D249 routine copies a small routine into the zero page that
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; calculates the checksum. It returns with carry set = error and
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; carry clear = OK. So we just patch the JSR to always clear the
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; carry. For now.
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.code
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.org $C53D
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nop
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nop
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clc
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