collapseos/arch/z80/trs80/blk/612
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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( We process the 0x20 exception by pre-putting a mask in the
(HL) we're going to write to. If it wasn't a 0x20, we put a
0xff mask. If it was a 0x20, we put a 0x7f mask. )
: @GET,
A 0x03 LDri, ( @GET )
DE COM_DRV_ADDR LDdi,
0x28 RST, JRNZ, L2 FWR ( maybeerror )
A ORr,
CZ RETc, ( Sending a straight NULL ends the comm. ) ;
: @PUT, ( @PUT that char back )
C A LDrr,
A 0x04 LDri, ( @PUT )
0x28 RST, JRNZ, L3 FWR ( error )
A C LDrr, ;
H@ ORG !
HL DEST_ADDR LDdi, ( cont. )