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z80_monitor/include/bios.inc
T
2026-10-01 12:44:11 +02:00

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; Stable assembly ABI exported by the resident BIOS at C000.
BIOS_PUTC = 0xC050 ; A = character; preserves all registers
BIOS_TRY_GETC = 0xC053 ; returns A = character or 0; preserves BC..IY
BIOS_GETC = 0xC056 ; blocking; returns character in A
BIOS_IO_OUT = 0xC059 ; A = port, L = value; preserves all registers
BIOS_IO_IN = 0xC05C ; A = port; returns value in A
BIOS_DELAY_MS = 0xC05F ; HL = milliseconds; preserves all registers
BIOS_MONITOR = 0xC062 ; warm-start the monitor; does not return
BIOS_BANK = 0xC065 ; A=0 split 48K/16K, otherwise upper 64K
BIOS_ROM_DISABLE = 0xC068 ; disable ROM while preserving the bank selection