Epson PC AX Technical Manual page 100

PRINCIPLES OF OPERATION
Read circuit
The VFO circuit has the following modes.
Data transmission speed
1. SOOK bps mode
2. 300K bps mode
3. 2S0K bps mode
These modes are selected by AO~ DO~ D1~ WR and 3XVN signals.
REV.A
FDC(765)
VFO
2-72
WINOOW WINOOW RAW RO
RO OATA
-
RO
-
SYNC
.
SYNC
C
{=:
AO
00
~---.
01
----.
WR
3XVN WClK
I'
3XVN WClK
GAATFD
FIGDRE 2-4-12. FOD DATA READ CIRCUIT
REAO OATA