Electronics > Projects, Designs, and Technical Stuff
Cloning a Commodore PET-2001
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MK14:
Thanks for the video, and very interesting project.
I'm amazed at how neat, the internal construction of your project is.
It seems to be working very well, and has brought back, found memories to me, by watching the video.
Well done!   :)

One quick question. What is the difference, between the two versions of basic, apparently selectable, by the switches on your unit ?
GK:
The upgraded BASIC gets a big list of bug and limitation fixes, the Bill Gates Easter egg and "Tiny Mon" (TIM), a simple machine language monitor.
Some software written with work-arounds for the original BASIC bugs and limitations might conceivably not work properly with the fixed, "upgraded" BASIC, so I added being able to run both as a feature. Also the character ROM bundled with the original BASIC machines swapped upper and lower case A-Z in the second page of the character set - that being the "alternate" page called the "business" set, as opposed to the "graphics" set that the machine boots up in by default.

 
GK:
Finally, the project web page is not yet complete, but all of the technical documentation and design files are posted:

http://www.glensstuff.com/pet2001/pet2001.htm
 
SiliconWizard:
Impressive  :-+
MK14:

--- Quote from: GK on November 29, 2018, 07:15:22 am ---The upgraded BASIC gets a big list of bug and limitation fixes, the Bill Gates Easter egg and "Tiny Mon" (TIM), a simple machine language monitor.
Some software written with work-arounds for the original BASIC bugs and limitations might conceivably not work properly with the fixed, "upgraded" BASIC, so I added being able to run both as a feature. Also the character ROM bundled with the original BASIC machines swapped upper and lower case A-Z in the second page of the character set - that being the "alternate" page called the "business" set, as opposed to the "graphics" set that the machine boots up in by default.

--- End quote ---

Thanks for that really nice explanation.
It must be real fun, playing around with those different versions, of the PETs Basic roms and things.

You're tempting me, to build your project   :)

Thanks for making it open source and/or available online and here. It makes a very interesting read and/or project to build.

One thing/feature you forgot.
When an early PET was switched off, you could see a white dot, that faded over a number of tens of seconds, in the middle of the (crt) screen. Unfortunately, you seem to have forgotten about it. (If I remember correctly).
Only joking, no you have done a great reproduction job!
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