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collapseos/blk/583
2020-08-15 08:11:48 -04:00

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( ACIA INT handler, read into ACIAW> )
( Set RST 38 jump ) PC ORG @ 0x39 + !
AF PUSH,
ACIA_CTL INAi, 0x01 ANDi, ( is ACIA rcv buf full? )
IFZ, ( no, abort ) AF POP, EI, RETI, THEN,
HL PUSH,
HL ACIAW> LDdi, A (HL) LDrr,
HL DECd, (HL) CPr, ( W> == R> ? )
IFNZ, ( buffer not full )
( get wr ptr ) HL ACIA( LDd(i),
L ADDr, IFC, H INCr, THEN, L A LDrr,
( fetch/write ) ACIA_IO INAi, (HL) A LDrr,
( advance W> ) ACIAW> LDA(i), A INCr,
ACIA_BUFSZ 1- ANDi, ACIAW> LD(i)A,
THEN,
HL POP, AF POP, EI, RETI,