HP-41 RAMBox Questions

[Raymond Del Tondo]

Hi,

"ES RSU- 1A" is an Eramco Systems ROM, usually as part of their own RAM boxes;-)

AFAIK the 64k version of the W&W RAM box was named "W&W RAM-Box II",
and is covered in the CY manual.

The "RAMBOX 64b" ROM will work for 32k and 64k RAM boxes.
Of course in 32k units, the PG.. functions are meaningless...

Actually if the unit doesn't react on a PG<> ,
then I'd say it's a 32k version.

If it were a 64k version (aka RAM-Box II),
and the counterpart of "b" waited there,
it would switch pages, and show "RAMBOX 64a" in the CAT.

If the "RAMBOX 64a" isn't there, then I'd expect kinda
reaction from the machine, be it either a noticable delay
or even lock up.


Back then I revived several CY units and RAM boxes using
my CY-INIT ROM.

It worked for 32k units, too.
However up to ca. 2007, 32k units revived using my tool
have the "b" ROM on page 8, since my tool
was written with the CY as main target,
and didn't check whether bank switching was successful or not.

So first the "a" image was written, then a bank switch was issued,
then the "b" image was written.
Later I made a separate init ROM for 32k units.


However if there are holes in the CAT listing, then it may also be a modified version,
or worse, a defective image.