Post Reply 
CMT 64Kb RAM module for HP-71b question
10-12-2021, 05:17 PM (This post was last modified: 10-12-2021 05:23 PM by Sylvain Cote.)
Post: #31
RE: CMT 64Kb RAM module for HP-71b question
MULTIMOD setup ...
  • power on -> ok
  • POKE "2C000","1"
  • power cycle
  • INIT 3
  • OFF IO
  • VER$ -> HP71:1BBBB FTH:1B EDT:A KBD:C STRU:A MATH:2B JPC:F05 HPIL:1B
  • MEM -> 16770
  • power off

Testing ...
  • no front port memory modules
    • power on -> ok
    • MEM -> 16770
  • +32KB -> 32KB RAM into port 1
    • power off
    • insert 32KB RAM into port 1
    • power on -> memory lost
    • OFF IO
    • power off
    • power on -> ok
    • MEM -> 49533
    • power off
    • remove 32KB RAM from port 1
    • power on -> ok
    • MEM -> 16770
    • power off
    • insert 32KB RAM into port 1
    • power on -> ok
    • MEM -> 49533
  • +32KB -> 32KB RAM into port 2
    • power off
    • remove 32KB RAM from port 1
    • power on -> ok
    • MEM -> 16770
    • power off
    • insert 32KB RAM into port 2
    • power on -> ok
    • MEM -> 49533
  • +32KB -> 32KB RAM into port 3
    • power off
    • remove 32KB RAM from port 2
    • power on -> ok
    • MEM -> 16770
    • power off
    • insert 32KB RAM into port 3
    • power on -> ok
    • MEM -> 49533
  • +32KB -> 32KB RAM into port 4
    • power off
    • remove 32KB RAM from port 3
    • power on -> ok
    • MEM -> 16770
    • power off
    • insert 32KB RAM into port 4
    • power on -> ok
    • MEM -> 49533
  • +64KB -> 32KB RAM into port 1 and 2
    • power off
    • remove 32KB RAM from port 3
    • power on -> ok
    • MEM -> 16770
    • power off
    • insert 32KB RAM into port 1
    • insert 32KB RAM into port 2
    • power on -> ok
    • MEM -> 82296
  • +64KB -> 32KB RAM into port 1 and 3
    • power off
    • remove 32KB RAM from port 2
    • power on -> ok
    • MEM -> 49533
    • power off
    • insert 32KB RAM into port 3
    • power on -> ok
    • MEM -> 82296
  • +64KB -> 32KB RAM into port 1 and 4
    • power off
    • remove 32KB RAM from port 3
    • power on -> ok
    • MEM -> 49533
    • power off
    • insert 32KB RAM into port 4
    • power on -> ok
    • MEM -> 82296
  • +64KB -> 32KB RAM into port 2 and 3
    • power off
    • remove 32KB RAM from port 4
    • power on -> ok
    • MEM -> 16770
    • power off
    • insert 32KB RAM into port 2
    • insert 32KB RAM into port 3
    • power on -> ok
    • MEM -> 82296
  • +64KB -> 32KB RAM into port 2 and 4
    • power off
    • remove 32KB RAM from port 3
    • power on -> ok
    • MEM -> 49533
    • power off
    • insert 32KB RAM into port 4
    • power on -> ok
    • MEM -> 82296
  • +64KB -> 32KB RAM into port 3 and 4
    • power off
    • remove 32KB RAM from port 2
    • power on -> ok
    • MEM -> 49533
    • power off
    • insert 32KB RAM into port 3
    • power on -> ok
    • MEM -> 82296
  • +96KB -> 32KB RAM into port 1, 2 and 3
    • power off
    • remove 32KB RAM from port 4
    • insert 32KB RAM into port 1
    • insert 32KB RAM into port 2
    • power on -> ok
    • MEM -> 115059
  • +96KB -> 32KB RAM into port 1, 2 and 4
    • power off
    • remove 32KB RAM from port 3
    • power on -> ok
    • MEM -> 82296
    • power off
    • insert 32KB RAM into port 4
    • power on -> ok
    • MEM -> 115059
  • +96KB -> 32KB RAM into port 1, 3 and 4
    • power off
    • remove 32KB RAM from port 2
    • power on -> ok
    • MEM -> 82296
    • power off
    • insert 32KB RAM into port 3
    • power on -> ok
    • MEM -> 115059
  • +96KB -> 32KB RAM into port 2, 3 and 4
    • power off
    • remove 32KB RAM from port 1
    • power on -> ok
    • MEM -> 82296
    • power off
    • insert 32KB RAM into port 2
    • power on -> ok
    • MEM -> 115059
  • +128KB -> 32KB RAM into port 2, 3 and 4
    • power off
    • insert 32KB RAM into port 1
    • power on -> ok
    • MEM -> 147822
    • power off
Note: at each module insertion and removal, the cycle ON+MEM+OFF were done twice to see if memory was stable and with the memory lost exception who happened once, it was.
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: CMT 64Kb RAM module for HP-71b question - Sylvain Cote - 10-12-2021 05:17 PM



User(s) browsing this thread: 1 Guest(s)