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cheep eprom programmer [message #10141]

Sun, 09 October 2022 17:11

comwarrior
Messages: 11
Registered: April 2019

Junior Member

Hi all,
The cost of a programmer on ebay is a little too high for casual use.
So, i have a few eproms that i salvaged. I used a UV led that i hotmelted to the window to erase and a PIC to constantly read the eprom untill it was blank.
Programming the eproms is easy, but getting the data to the pic, not so much...

Is there some eprom programming software that will work over usb to serial that has a simple protocol?
Basically, the pic doesn't have enough ram to hold the contents of the eprom while it programs the eprom and then verify. So, it needs it to be sent in chunks and then the same again to verify. That being said, it could program a chunk and then verify from ram befor being sent the next chunk.

Any help always appreciated.
TIA

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Re: cheep eprom programmer [message #10142 is a reply to message #10141]

Mon, 10 October 2022 06:51

plasmo
Messages: 916
Registered: March 2017
Location: New Mexico, USA

Senior Member

I recall you are working on a Z80 with PIC as helper. You should be able to load Z80 EPROM programming software with help of PIC and program the EPROM using Z80.
Bill

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Re: cheep eprom programmer [message #10143 is a reply to message #10141]

Mon, 10 October 2022 10:42

cmacarthur
Messages: 26
Registered: April 2018
Location: Alberta / Montana

Junior Member

This may be what you are looking for
https://github.com/beneater/eeprom-programmer

CM

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Re: cheep eprom programmer [message #10144 is a reply to message #10142]

Tue, 11 October 2022 06:15

comwarrior
Messages: 11
Registered: April 2019

Junior Member

plasmo wrote on Mon, 10 October 2022 06:51

I recall you are working on a Z80 with PIC as helper. You should be able to load Z80 EPROM programming software with help of PIC and program the EPROM using Z80.
Bill

Bill, this is for a separate project, I baught a couple of Z80 SBC PCB's and wanted to build one as 'standard' and then frankinstine the other.

cmacarthur wrote on Mon, 10 October 2022 10:42

This may be what you are looking for
https://github.com/beneater/eeprom-programmer

CM

CM, Bens programmer doesn't have any software to download data from the PC. While MCU's have a lot of program flash that can be used for data (i'd say i could hold 128Kb in the MCU's i'm using) but this is programmed when you program the MCU.

Ive been having a look at a tape a glue solution.
most terminal software (i use putty) has XON and XOFF flow control. so, i'm thinking of opining the hex file in a txt editor and sending it a ASCII hex to the MCU which can then convert it into binary data and use flow control to stop the data when its chunk buffer is full untill its finished programming and verifying.
How does this sound?
TIA

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Re: cheep eprom programmer [message #10182 is a reply to message #10144]

Tue, 13 December 2022 05:28

quarterturn
Messages: 86
Registered: April 2018

Member

I TL866II+ is well worth the $70 or so it costs. Buy it from a legitimate source, it does get counterfeited.

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Re: cheep eprom programmer [message #10186 is a reply to message #10182]

Sat, 24 December 2022 10:14

cmacarthur
Messages: 26
Registered: April 2018
Location: Alberta / Montana

Junior Member

Here is a PI version
https://github.com/homebrew8088/Raspberry-Pi-32k-EEPROM-Prog rammer

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Re: cheep eprom programmer [message #10190 is a reply to message #10182]

Wed, 28 December 2022 10:02

bifo
Messages: 48
Registered: October 2019

Member

quarterturn wrote on Tue, 13 December 2022 05:28

I TL866II+ is well worth the $70 or so it costs. Buy it from a legitimate source, it does get counterfeited.

Absolutely agree with you, although I think they have an updated version out now. That being said, I was chatting with someone trying to restore an old synthesizer the other day and where they were, the cost of buying and then importing the TL866II+ I recommended was prohibitive, and I didn't have any idea about projects using arduino or other MCUs so if anyone knows of one that'd be useful to know.

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Re: cheep eprom programmer [message #10215 is a reply to message #10190]

Sat, 28 January 2023 19:49

Andrew B
Messages: 467
Registered: October 2015
Location: Near Redmond, WA

Senior Member
Administrator

It depends on the specific device you are trying to program. I'd expect an Arduino based (E)EPROM programmer for 2 or 3 of the common ROM chips would not be hard to do. I did an Arduino programmer for DIP PLDs at one point when my commercial programmer just refused to program something I needed to program, and I didn't want to roll the dice on another different programmer to try to make it work.

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Re: cheep eprom programmer [message #10220 is a reply to message #10215]

Mon, 30 January 2023 07:20

plasmo
Messages: 916
Registered: March 2017
Location: New Mexico, USA

Senior Member

It may be interesting to build an EPROM programmer based on retro technology so you can have both retro computer AND a programmer. I designed two such programmers; one based on Z280 and another based on 6502. 68HC11 should also make a simple, cheap EPROM programmer.
Bill

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Re: cheep eprom programmer [message #10224 is a reply to message #10220]

Tue, 31 January 2023 12:13

etchedpixels
Messages: 333
Registered: October 2015

Senior Member

68HC11 alas is no longer a cheap part. Whilst it is still made it's priced to persuade people to move to something else.

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