Found these inside a non-working 71B

[Paul Berger (Canada)]

(03-15-2018 10:40 PM)Dave Frederickson Wrote:  According to J-F's doc,

http://www.jeffcalc.hp41.eu/files/hhp96k.pdf

grounding the ID pin will disable LCIM and the module will be configured as a multi-chip module.

I suspect that the ID pin affects the LCIM bit on the first or second module only. If the pin is grounded then modules 1 and 2 or 2 and 3 get configured as a 64k port and if not then as three as 32k modules.

So, Mike, you might try connecting a short wire between pins 1 and 11 on the first module and see if you get a single 64k port.

Dave

Grounding the pin causes the chip it is grounded on to not turn on the LCIM bit in its config word this means that if the next module in the daisy chain has this pin high the capacity of the logical module will be the combined capacity of the two. This is how I observed it operating when I tried it on a HHP module I repaired and am now testing.

Paul.