EPROM programmer

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e668ecp
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EPROM programmer

Post by e668ecp » Tue Jun 30, 2020 6:34 pm

Hello again,

I have purchased some TMS 28C128-1JL eproms and have tried to blow this using my Solidisk UVIPROM blower.. however it started well by showing what it was doing on screen and then this got all garbled around about address 3c00.

I have compared the chip using the *COMP command and it obviously hasn't blown it properly

Any suggestions as what to do as its years since i've done anything like this!

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daveejhitchins
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Location: Newton Aycliffe, County Durham
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Re: EPROM programmer

Post by daveejhitchins » Tue Jun 30, 2020 6:39 pm

e668ecp wrote:
Tue Jun 30, 2020 6:34 pm
Hello again,

I have purchased some TMS 28C128-1JL eproms and have tried to blow this using my Solidisk UVIPROM blower.. however it started well by showing what it was doing on screen and then this got all garbled around about address 3c00.

I have compared the chip using the *COMP command and it obviously hasn't blown it properly

Any suggestions as what to do as its years since i've done anything like this!
2 Questions: 1) Where did you get the parts from? 2) What Acorn machines have you?

1) If they're from China - that may be a clue - 2) You may be able to program them in your computer.

Dave H :D
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ARA III, ABR, ATI, AP6, MGC, AP5 . . .
For a price list, contact me at: Retro Hardware AT dave ej hitchins DOT plus DOT com

e668ecp
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Re: EPROM programmer

Post by e668ecp » Tue Jun 30, 2020 6:41 pm

1) UK - don't like Chinese fake stuff
2) BBC B with UVIPROM 1.1 eprom blower.. like http://8bs.com/see/solidisceprommertop.jpg

e668ecp
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Re: EPROM programmer

Post by e668ecp » Tue Jun 30, 2020 6:48 pm

The UVIPROM says 12.5v on it.. are the chips okay with that?

Kazzie
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Re: EPROM programmer

Post by Kazzie » Tue Jun 30, 2020 6:54 pm

A glance at a datasheet for the TMS27C128 suggests they want 13V voltage on Vpp and 6V on Vcc when programming.
BBC Model B 32k issue 7, Sidewise ROM board with 16K RAM
Archimedes 420/1 upgraded to 4MB RAM, ZIDEFS with 512MB CF card
Acorn System 1 home-made replica

e668ecp
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Re: EPROM programmer

Post by e668ecp » Tue Jun 30, 2020 7:01 pm

Tried again with the same chip and SUCCESS!!!

First chip (MMFS) i've blown since I was about 15yrs old

The switch on the Vpp was dicky and the BBC wasn't making interference noise like I remembered it did

e668ecp
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Re: EPROM programmer

Post by e668ecp » Tue Jun 30, 2020 7:02 pm

Thanks again.. i'm dead chuffed (must be getting simple haha)

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