HP97 The journey begins
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10-21-2021, 01:50 AM
Post: #461
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RE: HP97 The journey begins
Hi all,
Well, the latest (last) board design has been submitted to the fabricator. The board has single processor, printer and card interfaces, storage for 800+ cards, Continuous Memory, programmable print speed and intensity, battery backed alarm clock with 5ppm accuracy and piezo buzzer, Bluetooth, HP-97S style interface via electrically isolated serial port, direct plug in replacement - no soldering, re-flash capability and no need for the original printer interface card. The PIC had one spare output remaining so I added an IR diode for an external printer. I have written the IR code and it seems to be in spec on the scope. I had to create a new print ROM for it as the HP82240 printer does not have the HP-97 characters like [sqrt] etc. You can also use an emulated 82240 style printer via Bluetooth on the PC, where you can store print lists and print hard copies on a standard printer. The font is similar to 97 printer. These interfaces were quite tricky as the 97 printer gets a line of data in spurts all terminated by end of line characters with no easy way to determine what is coming next. Fingers crossed the new board has no problems. cheers Tony |
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