On 2017/04/03 9:10 AM, wrote:
On Sun, 02 Apr 2017 22:29:38 -0700, mike wrote:

On 4/2/2017 12:28 PM, wrote:
On Sat, 1 Apr 2017 15:15:19 -0700, John Robertson
wrote:

On 2017/04/01 12:52 PM, wrote:
The replacement circuit board arrived yesterday afternoon. I very
carefully grounded myself as well as the new and old boards. Then,
taking the care of a watchmaker, removed and inserted the 6 EPROMs.
Upon firing up the machine NO MACHINE ERROR! Cool. Now I'm gonna buy
an EPROM programmer and learn how to copy all the EPROMS in the
machine. Thanks everybody for the good advice.
Eric


What type of EPROMs are used? If from the 70s could be 2716s, 2532s,
2732s or possibly 2764s. Early 70s might be 1702As.

Not all programmers can read the early parts - 1702A, 2716, or 2532 so
do check the number on the EPROM before investing in the wrong burner!

John :-#)#
The EPROMs are the 2716 so I had better check.
Thanks,
Eric

Keep your eyes out for a UV EPROM eraser.
If you're ever gonna do anything with those bits you saved,
you're gonna need one.
I don't suppose a UV LED would work, would it? Or what about leaving
the EPROM in direcr sunlight for several hours?
Thanks,
Eric


You need weeks in direct sunlight. And for the UV LED to work it would
have to have a wavelength to be shorter than 400 NM.

UV sterilizer would work. Any UV source that warns you to never look at
the bulb would likely work - the tube is not coated internally (clear
glass) for UV erasers so the raw UV does the work.

Obviously do not look at the UV source, if it will erase EPROMs it will
destroy your retinas.

John :-#)#

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