INS4004D in Pro-Log M900 PROM Programmer

Allison ajp166 at bellatlantic.net
Tue Aug 28 14:28:42 CDT 2007


>
>Subject: Re: INS4004D in Pro-Log M900 PROM Programmer
>   From: "Ethan Dicks" <ethan.dicks at gmail.com>
>   Date: Tue, 28 Aug 2007 14:16:18 -0500
>     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On 8/27/07, dwight elvey <dkelvey at hotmail.com> wrote:
>>  From what I've seen in the spec sheets, one would just use
>> a slightly modified 2716 socket of any machine. A few lines
>> of code should be enough. No special voltages, just special
>> sequences. All easily handled in software.
>
>My recollection is that the 2716 needs something like 21V or 26V on
>the programming pin.  As for a modified socket, I have an old "Z-80
>Starter Kit" SBC that happens to have a built-in EPROM programmer on
>one of the three ROM sockets.  There's a toggle switch to disconnect
>the programming voltage, but once enabled, you simply write to the
>address range of that EPROM socket, and after the data are presented
>to the ROM, the circuit wiggles the programming pin to write the
>EPROM.

It also requires the "write pulse" to be 50milliseconds long.  Write
is accomplished by supplying VPP (12, 21 or 26V version dependent)
then playing the OE/ and CE/ pins.

Allison


>
>It would not be difficult, in principle, to add this feature to, say,
>one of the empty ROM sockets on a PET, especially if you had an
>external benchtop power supply injecting the programming voltage
>(rather than generating it inside the PET housing).
>
>-ethan



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