Woodstock HP-27 ACT woes...

[PANAMATIK]

(09-12-2016 12:20 AM)John Garza (3665) Wrote:  ... However trig functions, stats, etc. are still a no go (I presume the ROM/RAM chip for the CORDIC tables, etc. ?)

-John

I remember I had a HP-25C calculator, which worked fine except for calculating trig functions. When analyzing the problem I found a single defective ROM bit in the 2048x10 bits ROM code, which caused the problem. By replacing the ACT with newACT using internal ROM mode everything worked fine again.

Bernhard