FRAM71B installation

[Erwin]

(12-18-2021 04:01 PM)J-F Garnier Wrote:  

(12-18-2021 10:58 AM)Hans Brueggemann Wrote:  the HP-71B declares/recognizes a freed port by the "3BDDDDDE" in that particular port's header. an attempt to claim that port back into main memory will fail if that header is not found.

If a RAM doesn't have the correct IRAM ID, the RAM will be put back as main RAM at the next configuration (power-up or any FREE/CLAIM PORT). You can't have an IRAM with an incorrect ID.

J-F

Dear Hans, J-F and Dave,

thanks for your outstanding support. The Jumper E0000 was set cause I use the Forth ROM image - so this should not be the problem. CN2-2 is not set so IRAM should be identified.
After a second reset (removed batteries) and Poked 32 "0" and the string again, IRAM wasn't visible. So I tried another time to FREE the Port (5.04) for IRAM and then it established it, of course the files in there are deleted (have a backup of this).
MEMBUF

Code:

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
  5   4   0   128  30000  0. MAIN
  0   5   0    16  80000  2
  5   0   0    16  88000  2
  5   1   0    32  D0000  2 FTH41
  5   2   0    32  C0000  2 JPCF04
  5   3   0    32  B0000  1 IRAM
  5   5   0    16  90000  2 FINANCE
  5   6   0    16  98000  2 CIRCUIT
>

SHOWPORT

Code:

showport
0.05  16384  2
5     16384  2
5.01  32768  2
5.02  32768  2
5.03  32768  1
5.05  16384  2
5.06  16384  2
0      4096  0
0.01   4096  0
0.02   4096  0
0.03   4096  0
5.04 131072  0

and the IRAM was correct. But couldn't find the part before.

Code:

peek$("B0000",8)
B3DDDDDE

No idea what happened. I thought after a power off and then POKE back the configuration string the system should be in the old configuration cause the IRAM is protected.

To find this out I removed the batteries again. After this procedure the CIRCUIT ROM was not visible anymore although it is still in the SHOWPORT (5.06).

Code:

HP71:2CDCC FTH41:1A EDT:A MATH:2B JPC:F04 HPIL:1B FIN:A
>SHOWPORT
0.05  16384  2
5     16384  2
5.01  32768  2
5.02  32768  2
5.03  32768  1
5.05  16384  2
5.06  16384  2
0      4096  0
0.01   4096  0
0.02   4096  0
0.03   4096  0
5.04 131072  0

But MEM is now 147819 so it seems the system recognizes the CIRCUIT ROM as ROM not IRAM-Type. No possibility to get it back. But the other IRAM is still there.
Tried the same procedure as above ... but with the same result the Port 5.06 was still there but now empty (CAT). No possibility to claim and free the port again or POKE the other identifier. So things got worst.
What's interesting, according to my notice The FINANCE and CIRCUIT should be of type"1" not "2".

Looks like I have to make the install from scratch again. But maybe there are other ideas outside ...

[/quote]