HP97 The journey begins
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10-01-2021, 06:35 AM
(This post was last modified: 10-01-2021 06:37 AM by teenix.)
Post: #431
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RE: HP97 The journey begins
Hi all,
Since oiling the printer it seems to be settling down. I received an email with another original 97 CPU and printer experiencing the same changing line lengths. Some oiling there fixed the problem too, so I'm guessing that there is not a lot of torque control for the original setup even though it has speed monitoring. Once the PWM maxes out there is not a lot more it can do. Attached is a new printout. The first 2 lines show a user programmable change in intensity and the last line has the user programmable speed decreased. I have gone over the software again and have remodeled the printer ROM data, plus a few software changes and have enabled some extra PIC hardware. Now I'm pretty much 100% sure the whole setup can be run with a single processor. Depending on what is happening the processor may have to do these functions all at the same time... Execute HP code Update the LED display Read the keyboard and switches Control the keyboard buffer Service the card reader Service the printer, including shutting it down asap in case of code or motor failure Monitor for external commands Control the 97S functions (still in progress) Quite a bit for it to do. cheers Tony |
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