[Coco] HITACHI HD63C09EP
snhirsch at gmail.com
Thu Aug 4 13:11:56 EDT 2011
On Thu, 4 Aug 2011, gene heskett wrote:
> On Thursday, August 04, 2011 12:29:22 PM Steven Hirsch did opine:
>> On Thu, 4 Aug 2011, Mark Marlette wrote:
>>> My last bulk purchase of over 200 pieces from Russia, untested, good
>>> deal.... :)
>>> Over 50% failure rate.
>>> I see these quantities are not that high.
>> Will let you know. I picked a couple up along with some 27C400 16-bit
>> EPROMs (needed for Amiga Kickstart BIOS). Little ventured, little
> That is a real find, commies lawyers made that chip disappear when it
> became obvious that their OS3.1 sales were being impacted. I called the
> chip maker and offered to take the first 50k pieces if they would make
> another run, but they weren't interested.
> I had to fix every one of the 10 or so 3.1s kit I bought from commie for
> the tv station, every blessed one of them. I had to read them out in my
> programmer at the station, and re-burn the exact same data into the top
> (otherwise empty) half because commie checks the top of the eprom for valid
> data before it will use it, that is where it gets the exec address from.
> The idiots they hired to run their programmer put the file in the bottom
> half of the chip in those machines that were setup for a 2 chip kickstart.
I thought the "official" Commodore ROMs were masked parts. Sounds like
yours were EPROMs without a window for the leading "E".
I had to build an adapter board for my Andromeda programmer to handle
16-bit parts. Can't say enough good things about this product.
Inexpensive, well supported and you can buy bare-boards for the (usually
pricey) personality adapters and fab them yourself. I originally bought
it to handle bipolar PROMS. Price out a commercial unit that handles
those sometime if you want sticker-shock!
And, yes, I know about the need for double-burning :-) Been there, got the
> Now you know "The rest of the story" ;-) Be aware that chip seems to have
> a very limited re-programming cycle life. I lost 2 of them in that rescue
> procedure. Some of the later ones they shipped were even OTP's, no erase
> window. My comments on that stupidity were not sharable or printable. But
> amazingly, I could still burn the top half and use it. I had a xeltek (sp)
> programmer, could program anything.
There a few vendors on eBay that have brand-new ones from time to time.
But, I hear your point. The last used ones I bought had a 20-30% fallout
rate. Beggars can't be choosers, since as you point out they are close to
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