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/ vim: set sw=8 noexpandtab :
*000
INTRET, 0
JMP GOTINT
*010
HEAD, 7777 / because preincrement
TAIL, 7777
*100
TTBUSY, 0 / FIXME: sometimes we get wedged with TTBUSY=1, but TT flag is clear (no TT interrupt occurs)
*200
CLA IAC
KIE
ION
CLA
LOOP, TAD TTBUSY
SZA
JMP LOOP
TAD TAIL
CMA IAC
TAD HEAD
SNA
JMP LOOP
CLA
CDF 0010
TAD I TAIL
CDF 0000
IOF / critical section
TPC
CLA IAC
ION
DCA TTBUSY / end critical section
JMP LOOP
*400
SAVEA, 0
SAVEF, 0
GOTINT, DCA SAVEA
GTF
AND (7577)
DCA SAVEF
TSF
JMP KBIN
DCA TTBUSY
TCF
KBIN, KSF
JMP RETINT
KRB
CDF 0010
DCA I HEAD
CDF 0000
RETINT, CLA
TAD SAVEF
RTF
CLA
TAD SAVEA
ION
JMP I INTRET
|
