ACT available

[Nigel (UK)]

(12-28-2014 09:39 PM)Mark Hardman Wrote:  

(12-28-2014 07:33 PM)Nigel (UK) Wrote:  Questions for Bernhard:

I have an HP-25 on which the RAM doesn't work at all - no program steps, no memory registers. Would this machine be a suitable candidate? I understand that the ACT chip and the RAM are separate, but perhaps your ACT replacement does not use the original RAM.

Yes.

I could channel a certain frequent poster and suggest you RTFT. ;-)

From the top post:

(11-17-2014 03:40 PM)PANAMATIK Wrote:  To avoid questions:
The chip is suitable only for HP-21, HP25 etc. devices with PMOS design, not for Continuous Memory CMOS devices.
It executes either the original ROM Code from the on board ROM Chips or internal ROM Code.
It contains a program interface for updating the firmware or for other purposes.
The RAM Chip is not longer needed after the replacement, because the chip does have enough internal RAM.

Thank you! Not sure how I missed that. I think the question about HP25C support is still open, though.

Nigel (UK)