Re: HP 67 Card reader still no go Message #5 Posted by Viktor Toth on 23 May 2001, 3:00 a.m., in response to message #4 by David Smith
The chip at the end of the long, thin circuit board is marked 1826-0322 which, according to the HP-97 Service Manual, is just a sense amplifier. The HP-67 doesn't have a separate Card Reader Chip (CRC), these functions I believe are integrated into the main CPU.
I also have an HP-67 that has a similar problem. Experimenting with it, I found that it can write cards fine (and these cards are readable on another HP-67), however, it cannot read cards. The outputs of the Sense Amplifier appear normal on a 'scope, which leads me to suspect that at least in this case, it's the main chip that went bad (although it is also conceivable that I have a faulty ROM chip.)
Viktor
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