[FRAM71] Pre-Production Batch

[Dave Frederickson]

(03-04-2015 05:28 PM)Hans Brueggemann Wrote:  

(03-03-2015 10:13 PM)Dave Frederickson Wrote:  Feature Request: In a future hardware rev, would it be possible to have 1 MiB of FRAM so that more ROM's could be bank-switched?

upcoming FW430 will be nuking the fridge and "1MByte-Ready", but there will be no hardware spin. Instead, the inclined user may (at his own risk, that is) simply solder an identical FRAM chip on top of the existing one, paralleling all signals except /CE. /CE then gets a connection to one of the FPGA's spare I/Os, and another spare I/O will hold a jumper to manually select either "top" or "bottom" FRAM and supply your HP-71B with an "alter ego".
this hardware-hack is possible with all FRAM71s with HW103 and up.
please don't ask for more than 1MByte though, because i'm running out of I/Os ;o)

hans

Excellent!

I found FRAM chips at Verical for $26USD ea. plus only $4.05 shipping in the U.S.