XEROX820

HOOKING A PRINTER TO THE XEROX 820
----------------------------------
THE Z-80A GENERAL PURPOSE PIO IS ACCESSIBLE ON THE MAIN CPU BOARD
ON CONNECTOR J8. THIS PIO IS PROGRAMMED BY THE ROSR MONITOR AT POWER-ON
TO PROVIDE A PARALLEL CENTRONICS-COMPATIBLE INTERFACE FOR A PARALLEL
PRINTER.  CONNECTOR J11 IS AN OPTIONS JUMPER CONNECTOR WHICH MUST
HAVE CERTAIN JUMPERS IN PLACE TO CORRECTLY STEER THE PARALLEL DATA.

J8 IS A 40 PIN DIP CONNECTOR LOCATED BEHIND J2 AND J3 (REAR APRON CONNECTORS)
AND IS PARALLEL TO THE REAR APRON.

J11 IS A 20 PIN DIP CONNECTOR LOCATED BEHIND J2, PERPENDICULAR TO THE REAR
AND AT RIGHT ANGLES TO J8.  J11 MUST HAVE THE FOLLOWING PINS JUMPERED:
5-6, 9-10, AND 17-18.

FOLLOWING ARE THE J8- PINS TO CENTRONICS CONNECTOR- PINS WIRING:
J8-30-------STROBE------CC-1
J8-6 -----DATA BIT 0----CC-2
J8-8 ----  "    "  1----CC-3
J8-10----  "    "  2----CC-4
J8-12---   "    "  3----CC-5
J8-14---   "    "  4----CC-6
J8-16---   "    "  5----CC-7
J8-18---   "    "  6----CC-8
J8-20---   "    "  7----CC-9
J8-40----ACKNOWLEDGE----CC-10
J8-34------BUSY---------CC-11
J8-38-----ON-LINE-------CC-13
J8-26----AUTO LF--------CC-14
J8-37-----GND-----------CC-16
J8-1------ " -----------CC-19
J8-3------ " -----------CC-20
J8-5------ " -----------CC-21
   .       "                .
   .       "                .
   .       "                .
J8-21----- " -----------CC-28
J8-3 ----- " -----------CC-29
J8-35----- " -----------CC-30
J8-39----- " -----------CC-33
J8-28----- " -----------CC-36

73 AND GOOD LUCK. WAYNE, KB6CSP@WB2WXQ.#WNY.NY.USA.NA