Casio fx-8500G weird behavior with FA-80 interface
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05-03-2022, 11:01 AM
Post: #2
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RE: Casio fx-8500G weird behavior with FA-80 interface
(05-02-2022 07:28 PM)Dave Britten Wrote: This is a long-shot, but I'm curious if anyone here has ever seen this. I've got an fx-8500G and a pair of FA-80 cassette/printer interfaces. When I connect the calculator to the interface and power it up, it suddenly acts like it's an fx-7000G with slightly more RAM - none of the fx-8000/8500 features seem to be present. Pressing MODE 0 to enter the text editor just types a 0 on the "home" screen, and MODE Ans to recall the input buffer just types Ans. Also, most of the RAM is reportedly missing, with only around 1500 bytes available according to the program write mode screen. And of course, none of the cassette I/O commands are recognized. Hmm, odd. Presumably this happens on both FA-80s? The circuit for the FA-80 is here: http://www.pisi.com.pl/piotr433/fa80.png I don't see anything obvious that would cause this behaviour. You could try disconnecting some of the control signals on the connector and see if that affects the behaviour. Are all pins and sockets on the I/O connector on the calculator OK? Andrew |
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Messages In This Thread |
Casio fx-8500G weird behavior with FA-80 interface - Dave Britten - 05-02-2022, 07:28 PM
RE: Casio fx-8500G weird behavior with FA-80 interface - blackjetrock - 05-03-2022 11:01 AM
RE: Casio fx-8500G weird behavior with FA-80 interface - Dave Britten - 05-03-2022, 12:54 PM
RE: Casio fx-8500G weird behavior with FA-80 interface - Dave Britten - 05-06-2023, 09:25 PM
RE: Casio fx-8500G weird behavior with FA-80 interface - blackjetrock - 05-07-2023, 05:55 AM
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