Sharp MZ-80B - 4.3 Signal system for the 8255 block, 8253 block and PIO block

50
02F1
CD8F03
CALL
W8YTE
02F4
7D
LD
A,L
02F5
CD8F03
CALL
W8YTE
02F8
CD3905
CALL
LONG
02F8
1D
DEC E
02FC
2004
JR
~Z,WTAP4
02FE
AF
XOR
A
02FF
E1
RETH8: POP HL
0300 C1
POP 8C
0301
C9
RET
0302
CD1D05
WTAP4:
CALL
SHORT
0305 10F8
DJNZ
-3
0307 El
POP HL
0308 C1
POP BC
0309
18D1
JR
WTAPE+2
0308
0308
0308
0308
1E02
RTAPE: LD
E ~
~~
030D C5
PUSH 8C
030E E5
PUSH HL
030F CD4604
RTAP1:
CALL
EDGE
0312
38E8
JR
C,RETHB
0314 CD5405
CALL DLYR
0317
D8E1
IN
A,
<ElH)
0319 . E640
AND
40H
0318 28F2
JR
Z,RTAPl
031D 210000
LD
HL,OOOOH
0320
222800
LD <SUMDT>
,HL
0323 E1
POP HL
0324
C1 POP
8C
0325 C5 PUSH
BC
0326 E5
PUSH
HL
0327 CDA003 RTAP2:
CALL
RBYTE
032A 38D3
JR
C,RETH8
032C 77
LD
<HL>
,A
032D
23
INC
HL
032E
08
DEC
8C
032F
7n
0
LD
A,8
0330 81
OR
c
0331
20F4
JR NZ,RTAP2
0333
2A2800
LD
HL,
<SUMDT>
0336 CDA003
CALL
RBYTE
0339
38C4
JR
C,RETH8
0338
4F
LD
C,A
033C
CDA003
CALL
RBYTE
033F
388E
JR C,RETH8
0341
8D
CP
L
0342
2006
JR NZ,RTAP3
0344 7'7
LD
A,C
0345
8~
CP
H
0346
3EOO
LD
A,O
0348
2885
JR
Z,RETH8
034A
1D
RTAP3:
DEC
E
0348
20C2
JR NZ,RTAP1
0340
119206
TAPER:
LD DE,SUMMES
0350
CD8605
CALL
NLMSG
0353
3EFF
LD A,FFH
0355
37
SCF
0356
18A7
JR
RETH8