Epson LQ 1050 - B/W Dot-matrix Printer Technical Manual page 199

The E05A 16GA is a custom gate array used to implement the following functions.
Super/subscript generator converts the normal CG pattern (image data) received from an external
device into super/subscript character data.
Italic character generator converts the normal CG pattern (image data) received from an external
device into italic character data.
24-bit shift register.
8-bit parallel interface. Automatically latches the data upon receiving the strobe signal, and sets the
BUSY signal HIGH. inputs and outputs other control signals.
When a serial interface is used, multiplexes the two receive data lines (RXD and the seventh bit of
the 8-bit parallel interface) using internal logic, and outputs the result to an external device.
Logically ANDs the two external reset signal inputs using internal logic, and output the result to an
external device (one-channel).
Output ports with different types
General purpose input port.
of output.
STRB
RSTOUT
BUSY
ACK
PE
ERR
PDO
PAO
Vcc
Figure A-8. GA E05A16GA Pin Diagram
A-13