26 Oct
2021
26 Oct
'21
12:19 p.m.
Mark Moulding via cctalk wrote:
From: Tom Hunter <ccth6600 at gmail.com>
Subject: Programming Bipolar PROMs
K155RE3? (?155??3)
I've had to repair a stepper motor controller from some CNC grinding
machine lately. Luckily I had 2 such controllers, one with a working ROM
(some TIBPxxx) and I had K155RE3 in a box. I've programmed it with an
Labtool48 using Dataman48 Software on Windows. The Dataman ist the same
thing as the Labtool. It programmed the ROMs successfully as 74S188,
but the first peace failed to program correctly. Programming was
relatively fast, below 2 seconds with verify.
Regards,
--
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The part is an Intersil IM5600CP, but these were
also made by others, for
example Signetics and Philips made the 82S23 and TI and NTE made the
faster
SN74S188N. Some vendors still sell these parts and there are even a few on
Ebay.
How do I program these PROMs? I found one somewhat obscure description of
the algorithm in the NTE datasheet, but I suspect that each manufacturer
had (somewhat) different algorithms.
I built a project using Russian clones of the 74188, and ended up building a
programmer for them. The programming process is slow (over a minute to
program 32 bytes), draws quite a bit of power (the chip is uncomfortably
warm afterwards), and it took a while to work out the programming algorithm.
Also, as Tom Hunter mentioned, the programming process isn't perfect - about
5% don't program correctly; I don't know if this is my algorithm or the fact
that the clones aren't so good. However, once programmed, they seem to work
just fine.