My PDP-8/E currently has four fields of core installed - fields 0
through 3. All fields pass both the 4K Memory Address Test and 4K
Checkerboard Test with no problems. The Ext. Memory Address Test also
runs fine. However, when I run the Ext. Memory Checkerboard Test I get
wierdness.
Here is the run:
PDP-8E EXT MEM DATA & CHKBD
SETUP SR & CONT <--- Set SR to 000000000011
4 FIELDS IN THIS SYSTEM
FIELDS SEL'D ARE 6 5 3 2 0 <--- First bit of wierdness.
This should be 3 2 1 0
PROG WILL RELOCATE
PR LOC FAIL ADDR GOOD BAD PATTERN
01660 50000 7777 0000 ALL 0 - 10
01660 50001 7777 0000 ALL 0 - 10
This continues through fields 5 and 6 until I hit the halt key.
The Config is as follows:
PDP-8/E CPU
EAE
Ext Memory & Timesharing
ASR-33 Teletype and Associated Control
4K Core stacks for Fields 0 and 1, 8K Stack for Fields 2 and 3
What I don't understand is why the Ext. Mem Address Test works
correctly, but the Ext Memory Data and Checkerboard can determine the
number of fields while messing up on exactly which fields they are.
Anyone seen this before?
--
Christopher L McNabb
Operating Systems Analyst Email: cmcnabb_at_4mcnabb.net
Virginia Tech ICBM: 37.1356N 80.4272N
GMRS: WPSR255 ARS: N2UX Grid Sq: EM97SD
Received on Sat Nov 09 2002 - 21:09:01 GMT