[FRAM71] Pre-Production Batch

[Hans Brueggemann]

(06-05-2015 09:44 AM)Oulan Wrote:  What model of programmer could be used to re-program the module ?
ACTEL LC Programmer seems not to be manufactured anymore

you can use the MICROSEMI FlashPro4 programmer with a suitable adapter cable instead. Dave Frederickson has done a description here.

as a work-around for the IRAM-bug, you may want to try a hard-reset of the FRAM71 as follows:
1) back up all contents of your HP-71B, especially those, that are _not_ located in ROM or IRAM
2) switch off your HP-71B
3) remove all power supplies (batteries and/or wall adapter) from the HP-71B
4) take your FRAM71 out of the HP-71B and use a straightened metal paperclip to short-circuit pin VDD with pin GND for approx. 2 sec (RTFM, chapter 14, for pin locations!)
5) re-insert FRAM71 into the HP-71B
6) apply power
7) turn the HP-71B on. calculator will show "MEMORY LOST", but contents of IRAMs and ROMs should still be there.

hans