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-HMM1A-D-D_PDP-8e_Maintenance_Manual_Volume_1_Processor_Sep73.pdf
Schematics:
http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8e/MM8-EJ_Engineering_Drawings_May73.pdf
https://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/pdp8prints/mm8e.pdf
https://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/pdp8prints/mm8e-b.pdf
https://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/pdp8prints/mm8ej.pdf
On 11/6/2021 1:47 PM, Bill Degnan via cctalk wrote:
I am unable to confirm for sure the memory assignment process for I know
without a doubt how to set their page assignments. I can guess but that's
dangerous and inefficient. I want to test an unknown core stack, so I need
to know which RAM space I am testing.
I have a PDP 8e core stack with the following:
H121 8x12 core
G233E
G111C
Anyone know the process of assigning the RAM space on the boards?
Bill
