collapseos/arch/z80/rc2014/blk/603
Virgil Dupras 7001446212 Complete overhaul of recipes
Recipes contain bits and pieces of hardware-related knowledge, but
these bits feel sparse. I've been wanting to consolidate hardware-
related documentation for a while, but always fell at odds with the
recipes organisation.

We don't have recipes anymore, just a /doc/hw section that contains
hardware-related documentation which often translate to precise
instructions to run Collapse OS on a specific machine.

With this new organisation, I hope to end up with a better, more
solid documentation.
2020-10-30 20:39:39 -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,