memory assignment jumpers MM8EJ

This should help: On the G104 board there are some jumpers EMA0, EMA1 and EMA2.? These correspond to the the bits of the extended address of the board. A jumper inserted means 0 and a jumper removed means a 1. EMA??? 0? ?? 1 ???? 2 ? 0????? In???? In???? In ? 1????? In???? In???? Out ? 2????? In?? ? Out? In ? 3????? In?? ? Out? Out ? 4 ? ?? Out? In???? In ? 5????? Out? In???? Out ?? 6???? Out? Out? In ?? 7??? Out?? Out? Out Please note that the MM89EJ is an 8K memory board and will take up two memory fields, the one selected and the one selected plus 1 (i.e.? if the jumpers are in out in, the memory will be on fields (EMA) 2 and 3). This information can be found on page 2-6 of the PDP-8/e PDP8/f & pdp-8/m Processor Maintenance Manual Volume 1: http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8e/DEC-8E-HMM1… Schematics: http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8e/MM8-EJ_Engi… https://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/pdp8prints/mm8e.… https://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/pdp8prints/mm8e-… https://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/pdp8prints/mm8ej… On 11/6/2021 1:47 PM, Bill Degnan via cctalk wrote: