Date   : Thu, 11 Jan 2007 20:21:14 +0000
From   : splodge@... (Richard Gellman)
Subject: Programming lareg EPROMs

Hi,

The EPROM eraser turned up today. One click erasure of the first byte of
the EPROM (doh), and we're good to go....

EPROM loaded into programmer attached to the Amstrad 1640 PC (and with
the right EPROM type selected this time), and 10 minutes later, we have
a new 1 Mbit ROM :)

Plugged it into the M128 and..
*boooooooooooooooooooooooooooooooooooooooooooooop* *blank screen*.

<expletives>

Multimeter comes out, check of all the pins on the adapter board, turns
out A2 wasn't making it to the EPROM. One quick solder job later and...
*booop beep*.

My M128 is now running ADFS 1.53, DFS 2.28 (couldn't find a 2.29 image
:( ) and a Y2K fix :)

So I can confidently say, I can program 1Mbit MOS EPROMs.

-- Richard

Richard Gellman wrote:
> Jonathan Harston wrote:
>
>   
>> Persuing my desire to produce a custom MegaROM for my Master, does
>> anybody known where I can get 128K 27C010s programmed?
>>     
>
> Mind that sore point your touching there... ;)
>
> I got hold of a 27C1001 (pin compatible with the 27C010) with the intent
> to program with a 1mbit ROM image. Unfortunately I had my programmer set
> to 27100 (with has a different pinout, A16/OE swapped) and it
> misprogrammed the first byte, so the programmer gave up.
>
> I'm now waiting for an EPROM eraser to turn up in the post so I can try
> again...
>
> Other than that, I should be OK to make 128K EPROMS. I already have the
> socket adapter for the M128 made.. I just need to build that IDE board
> now..
>
>   
>> On a similar line, I'd like to put together a custom ROM-set for
>> my A5000. Does anybody known where I can get 1M EPROMs programmed?
>>     
>
> Mine doesn't go up that high :( I have seen programmers around that will
> do 1M EPROMs though, but you might find a large hole in your wallet for
> the privelege.
>
> -- Richard
>
>
>
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