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CMT 64Kb RAM module for HP-71b question
10-11-2021, 06:49 PM (This post was last modified: 10-11-2021 06:53 PM by J-F Garnier.)
Post: #22
RE: CMT 64Kb RAM module for HP-71b question
(10-11-2021 12:44 PM)Sylvain Cote Wrote:  I also did this test:
  1. no RAM memory modules
  2. INIT 3, MEM → 16760
  3. power off, insert 32K RAM into port 1, power on, MEM → 49517
  4. power off, insert 32K RAM into port 2, power on, MEM → 82280
  5. power off, insert 32K RAM into port 3, power on, MEM → 115043
  6. power off, insert 32K RAM into port 4, power on, MEM → 98654 → What?

OK, how this is mapped ...
Code:
MEM → 98654
DELAY 0,0
DISPLAY IS :PRINTER
COPY MEMBUF:TAPE
RUN MEMBUF
Port Dev Seq  Size Addr  Type
  1   0   0    32  30000  0
  2   0   0    32  40000  0
  3   0   0    32  50000  0
  0   0   0     4  78000  1
  0   1   0     4  7A000  1
  0   2   0     4  7C000  1
  0   3   0     4  7E000  1
  0   5   0    16  60000  2
  4   0   0    32  D0000  1
  5   0   0    16  68000  2
  5   1   0    32  C0000  2
  5   2   0    32  B0000  2
  5   3   0    16  70000  2

Power cycle and show memory map again
Code:
MEM → 146306 , memory is now what was expected
RUN MEMBUF
Port Dev Seq  Size Addr  Type
  0   0   0     4  70000  0
  0   1   0     4  72000  0
  0   2   0     4  74000  0
  0   3   0     4  76000  0
  1   0   0    32  30000  0
  2   0   0    32  40000  0
  3   0   0    32  50000  0
  4   0   0    32  60000  0
  0   5   0    16  80000  2
  5   0   0    16  88000  2
  5   1   0    32  D0000  2
  5   2   0    32  C0000  2
  5   3   0    16  90000  2

Ok, and what happens if you then do more successive power cycles with this configuration?
Doesn't it swing again between the bad and good memory maps? Check MEM after each power cycle.

J-F
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RE: CMT 64Kb RAM module for HP-71b question - J-F Garnier - 10-11-2021 06:49 PM



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