Epson LQ-2550 Technical Manual page 248

Timing
—
Generator
MMU
Address
Figure A-2. HD64180 Block Diagram
CPU
>
(2)
Asynchronous
(channel O)
Asynchronous
>
(channel 1)
>
<
v
Data
1
A-3
I
I
—
— TENDI
.
7 1
RXAO
RTSO
—