CMT 64Kb RAM module for HP-71b question

[J-F Garnier]

(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

Interesting, all the internal 4K ports were put as IRAM. Then a power cycle restored them as MAIN RAM.

Some background: during system config, each RAM (but not the ROM) is temporarily configured at 80000 to check if it is MAIN RAM or IRAM, by checking the IRAM signature, then parked at 40000 waiting for the final config.
Maybe something is wrong there.

J-F