modemwars/disassembly/drive1541.inc
2026-08-23 02:09:40 -05:00

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; drive1541.inc - 1541 VIA registers and DOS ROM entry points used by the loader
VIA1_PRB_SERIAL := $1800
VIA1_PRA := $1801
VIA1_DDRB := $1802
VIA1_DDRA := $1803
VIA1_T1C_HI := $1805
VIA1_PCR := $180C
VIA1_IFR := $180D
VIA1_IER := $180E
VIA2_PRB_DISK_CTRL := $1C00
VIA2_PRA_DATA := $1C01
VIA2_DDRB := $1C02
VIA2_DDRA := $1C03
VIA2_T1C_HI := $1C05
VIA2_PCR := $1C0C
VIA2_IFR := $1C0D
VIA2_IER := $1C0E
ROM_INIT_DRIVE := $D042
ROM_DATA_CHECKSUM := $F5E9
ROM_BIN_TO_GCR := $F78F
ROM_GCR_TO_BIN := $F8E0
ROM_MAKE_HEADER_GCR := $F934
ROM_RESET_VECTOR := $FFFC