Commodore Amiga A500 Technical Reference Manual page 218

W R I TE TI M I N G D I A G R A M
TR
02 INPUT
PERIPHERAL
DATA OUT
CS
RS3-RS0
R/W
DATA IN
D87-D80
R EA D TI M I N G D I A G R A M
02 INPUT
PORT IN
CS
RS3-RS0
R/W
TCYC
TCHW
TWCS
TADH
TADS
TRWS
TRWH
TDS
TPS
TWCS
TADS
TCO
TRWS
TACC
Figure 6.7. 8520 Timing Diagrams
TF
TCLW
TDH
TADH
TRWH
TDR
215
TPD