[A83] Re: more unconventional instructions
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[A83] Re: more unconventional instructions
Some of these are unconventional, others are not.
SLP OT0 IN0 OTDM OTDMR OTIM OTIM etc are Z180 instructions.
RETI is used to return from an interrupt. On calcs, it is equivalent to RET.
RETN is used to reutrn from non-maskable interrupt. Not used on calcs.
OTIR, OTDR, OTI, OTD, INIR, INDR, INI, IND are used with ports. See Ch 13 of
the Zilog docs for exact info. They're almost useless on calcs, although
they can be quite useful to read the keyboard port:
ld bc,16
ld hl,masks
loop:
oti
ini
jp pe,loop
masks:
.db mask,current_kb_state
.db mask,current_kb_state
;...
SCF is not at all unconventional. It sets the carry flag.
-----Original Message-----
From: assembly-83-bounce@lists.ticalc.org
[mailto:assembly-83-bounce@lists.ticalc.org]On Behalf Of Hyperbyte
Sent: Monday, July 02, 2001 8:02 AM
To: assembly-83@lists.ticalc.org
Subject: [A83] more unconventional instructions
I found a few more:
RETI
RETN
SLP (sleep?)
OTDM,OTDMR,OTDR
OTIM,OTIMR,OTIR
OUT0
OUTD
OUTI
SCF
--thanks
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