My Surprisingly Fast 41CX

[akpoff]

(01-25-2023 07:57 PM)Garth Wilson Wrote:  I'm glad it seems to work fine.  In the mid- or late-1980's, EduCalc was selling a speed-up kit which was supposed to make the 41 70% faster IIRC.  I bought one, but I read all the stuff before beginning the conversion, and it said you shouldn't do it if you use the HP-IL or combined modules.  I had both, and used them constantly, so I sent it back.

Hi Garth,
I saw your comment about that in another thread. I have the HP-IL module and a few HP-IL devices. The quickest to test will be the 82162A Thermal Printer.

Do you recall the specific concerns with HP-IL? Timing would be an obvious possibility, though the real-time clock seems to be unaffected.

As I understand the 41CL documentation, Monte's approach is way more refined in that it doesn't blindly speed-up everything, but only where it make sense. Of course he has the advantage of having designed his solution rather than having to work within the constraints of an existing circuit design. (Well, the 41CL still has some constraints to work around. )

Thanks for the note!

--Aaron