strange HP25 behaviour

[ignazio]

Hi Ignacio,
It's not our situation because we are able to write in the program memory and register data in the memory. The CMOS static RAM is deputed to the store of program and data, even the LastX is registered here. The X registry and the other stack registries (Y,Z and T) are resident on the ACT CPU. So the culprit can be only or a brocken ACT or the ROM 1818-0154, I fear this last most probably.

Let me work on the problem this evening.

Take care and hope.