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HP-41 MCODE Chess ROM ?????
09-10-2015, 04:01 PM (This post was last modified: 09-10-2015 05:24 PM by Ángel Martin.)
Post: #1
HP-41 MCODE Chess ROM ?????
I've come across a short mention to an MCODE Chess ROM for the 41, developped by L. Lirpa from Finland - and apparently presented in some PPC-UK Chapter meeting back in 1985.

See the actual article in page 85.3.51:
http://hp41.claughan.com/file/Prisma%201985-03.pdf

The article gives enough details (CAT'2 contents, buffer info..) to perhaps discard an April's fool joke (note that "L. Lirpa" is "April L" reversed!) so something must have been done - but this is a complete mystery as far as I know.

Anyone ever came across those EPROMs or that allegedly wonder ROM at all?
If it was an April's fool stunt then Prisma passed it on blindly!

It's a hoax! haha, great staging from those folks back then ;-))


''AM
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09-10-2015, 09:36 PM
Post: #2
RE: HP-41 MCODE Chess ROM ?????
Quote:Sc1-c3

This should have been Sb1-c3 of course.

Cheers
Thomas
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09-10-2015, 11:06 PM
Post: #3
RE: HP-41 MCODE Chess ROM ?????
Related:

Lirpa Labs has been releasing various home entertainment devices for many years. Their reviews, most recently in Sound and Vision, make for interesting reading.

Dr. Lirpa is an interesting character, indeed.

2speed HP41CX,int2XMEM+ZEN, HPIL+DEVEL, HPIL+X/IO, I/R, 82143, 82163, 82162 -25,35,45,55,65,67,70,80
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09-10-2015, 11:34 PM
Post: #4
RE: HP-41 MCODE Chess ROM ?????
(09-10-2015 11:06 PM)TASP Wrote:  Related:

Lirpa Labs has been releasing various home entertainment devices for many years. Their reviews, most recently in Sound and Vision, make for interesting reading.

Dr. Lirpa is an interesting character, indeed.

I Googled Lirpa Labs and found this:

[Image: newsurround400x255.jpg]

That must be Dr. Lirpa with an early VR monocle. Smile
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09-11-2015, 12:11 AM
Post: #5
RE: HP-41 MCODE Chess ROM ?????
(09-10-2015 04:01 PM)Ángel Martin Wrote:  See the actual article in page 85.3.51:
http://hp41.claughan.com/file/Prisma%201985-03.pdf

Here is a searchable PDF, in case one wants to copy and paste texts and submit them to Google Translator:

http://perlmeister.com/prisma/prisma-1985-03.pdf

Google Translator gets it wrong starting from the beginning, though: Schachrom für den
HP-41!!! --> Saddle Chrome for the HP-41 !!! Smile

Gerson.
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09-11-2015, 03:54 AM
Post: #6
RE: HP-41 MCODE Chess ROM ?????
Dr. Lirpa realized early on a perfect amplifier was impossible. However, in a stereo amplifier he engineered, he realized equal but opposite forms of distortion in the left and right channels would cancel out at the listeners sweet spot, and a perfect amplifier was possible after all.

The technique was further refined with the first Lirpa Quad System back in the 70s.

2speed HP41CX,int2XMEM+ZEN, HPIL+DEVEL, HPIL+X/IO, I/R, 82143, 82163, 82162 -25,35,45,55,65,67,70,80
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10-04-2015, 10:45 AM
Post: #7
RE: HP-41 MCODE Chess ROM ?????
Wasn't my chess for the 28S the first general chess implementation for a calculator? Certainly the first graphical chess for a calculator.

Not that it was overly playable. I spent a couple of days at my first job beating this implementation as quickly as I was able. At one move a day, it still took a while.

It was beyond hopeless but it did obey the rules.


- Pauli
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10-04-2015, 04:19 PM
Post: #8
RE: HP-41 MCODE Chess ROM ?????
(10-04-2015 10:45 AM)Paul Dale Wrote:  Wasn't my chess for the 28S the first general chess implementation for a calculator? Certainly the first graphical chess for a calculator.

Not that it was overly playable. I spent a couple of days at my first job beating this implementation as quickly as I was able. At one move a day, it still took a while.

It was beyond hopeless but it did obey the rules.

Never saw that one but your HP-41 program posted in the museum library is included in the new "POKER" ROM. I thought about adding it to the CHESS ROM (the real one, FOCAL-based) but there's too much code that'd need moving for that to happen. BTW on the CL 50x turbo this one takes about 1-3 minutes per move in level-4 !

I also remember a great HP-85 Chess Tape that played decent and had great graphics, that was fun to play as well.

Cheers,
'AM
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