Electronics > Projects, Designs, and Technical Stuff
Cloning a Commodore PET-2001
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GK:
I need to program a bunch of Microchip (previously Atmel) AT27C256R-45PU / AT27C512R-45PU parallel I/O, 5V, DIP, OTP EPROM ICs from supplied binary files.

Any recommendations for a reliable and cheap USB (not parallel port) programmer? This one linked below looks promising perhaps, but the AT series chips aren't specifically listed, just generic 27C32, 27C256, etc...... the old ultraviolet erasable types. Can anyone advise if these are cross-compatible?

http://www.ebay.com.au/itm/High-Speed-USB-TL866CS-Universal-Programmer-Support-All-BIOS-Multifunctional-/180926954184?_trksid=p2385738.m2548.l4275

Thanks.
German_EE:
Yes, they are cross compatible, the only difference between an OTP PROM and an EPROM is the quartz window. Just make sure that your code is 100% correct because with OTP devices mistakkes are costly.
BrianHG:
You can always try some of the modern flash pin-pin compatible equivalents if they are supported by the programmer.  Or, like I once did, static ram equivalents, with the VPP pin which would have been for the eprom pulled & a lithium coin cell added to the IC with dual schottkey diode.  Of course, these tricks are just for development until you switch to a prom.
GK:

--- Quote from: German_EE on June 03, 2017, 06:46:12 am ---Yes, they are cross compatible, the only difference between an OTP PROM and an EPROM is the quartz window. Just make sure that your code is 100% correct because with OTP devices mistakkes are costly.

--- End quote ---


OK thanks, that's what I figured.
GK:

--- Quote from: BrianHG on June 03, 2017, 06:52:43 am ---You can always try some of the modern flash pin-pin compatible equivalents if they are supported by the programmer.  Or, like I once did, static ram equivalents, with the VPP pin which would have been for the eprom pulled & a lithium coin cell added to the IC with dual schottkey diode.  Of course, these tricks are just for development until you switch to a prom.

--- End quote ---


I'm doing a CBM PET-2001 clone. Found the complete ROM binary set on the 'net and have deciphered the content. The 2k-8bit character ROM .bin goes straight to chip unmodified. The operating system (BASIC#1) was stored on 7 individual 2k-8bit ROM chips. So there are 7 OS .bin files labeled with sequential addresses. All I have to do is copy them into a single binary file to burn to a single ROM chip.

 
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