CMT 64Kb RAM module for HP-71b question

[Sylvain Cote]

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.