At 10:52 26.11.2005 -0800, Declan Moriarty wrote:
I sent them a large bill for the last piece of messing (Which they won't pay) so that suits me :-/. In those circumstances, it is a little difficult to borrow their programmer.
I'd say it's even easier: Go there, and take the programmer as payment :-)
ICT device 18CV8P. Old and new seem to be 150nS devices.
OK, you *do* need a universal programmer, and you have to check carefully if it supports the ICT devices. I was really lucky in 1998 when my broker offered me more than 3000 units of those in PLCC20 package. I was the only bidder, because none of his customers was able to erase/program them - got'm dirt cheap ;-)
Go check out pictures of my "IDE-fix express" product, each of the small boards has one of PEEL chips. The ICT devices have one drawback, they're a bit weak on the outputs (that's why the "express" portion of my product has a link between two outputs, so both pull to GND at the same time).
BTW: These logic devices (PAL, GAL, PEEL, MACH) are much faster than Eproms. If the speed grade is -15, then it's not 150ns like on Eproms, but really 15ns. That's even a pin-to-pin delay, you can get a bit faster if you're routing internally: an advantage of the ICT devices, you can choose if the feedback comes from "before" or "after" the output flipflop, where regular GALs can only feedback from the output.
AFAIK, ICT does not make these devices any more, and therefore does not offer the software any more. I still have a copy somewhere on the old DOS machine, contact me if you need it. It's a translator of GAL jedec files into PEEL jedec files, plus a fuse editor to make use of the additional features of the chip. The company might not be aware that PEEL chips do NOT eat the same jedec files as GAL chips.
As for Uwe Zimmerman's "no chance" posting, I guess the people who told you to find out the checksum were aware that you cannot read it if the security fuse is blown (the checksum is not written into the device, just a cross-check if the jedec file is valid). It's either they know the security fuse is not set (takes time to set it, so they might have skipped it to save money like Commodore did back in the days), or they are *really* asking for the user code, which can be freely chosen, and cannot be protected for obvious reasons.
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