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AL = function code FAh transfer data between 80186 and 65C12 I/O processor DS:BX -> control block (see #03211)
Return:
FLAGS destroyed control block updated
Note: There are more functions than are listed here, but details are not available
See Also: INT 40"Acorn" - INT 4B"Acorn" - INT 4C"Acorn"
Format of BBC Master control block for function FAh: Offset Size Description (Table 03211) 00h BYTE number of parameters sent to I/O processor (0Dh,0Eh) 01h BYTE number of parameters read from I/O processor (01h) 02h DWORD I/O processor address 06h DWORD 80186 segment:offset address 0Ah WORD number of bytes to transfer 0Ch BYTE operation type 00h write to 65C12 at 24 us/byte 01h read from 65C12 at 24 us/byte 02h write to 65C12 at 26 us/word 03h read from 65C12 at 26 us/word 04h write to 65C12 at 10 us/byte using 256-byte blocks 05h read from 65C12 at 10 us/byte using 256-byte blocks 0Dh BYTE 65C12 memory access control (only used if offset 00h = 0Eh) (see #03212)
Bitfields for 65C12 memory access control: Bit(s) Description (Table 03212) 7 unused 6 always use main screen memory if I/O addr 3000h-7FFFh (overrides bit 5) 5 use shadow screen memory if screen address specified 4 use current ROM rather than ROM selected by bits 3-0 (only if I/O address between 8000h and BFFFh) 3-0 paged ROM number
Category: Other Operating Systems - Int 4Ah - A
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