HP-25C Eumulator
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01-07-2015, 12:54 PM
(This post was last modified: 01-07-2015 12:59 PM by Chris Chung.)
Post: #136
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RE: HP-25C Eumulator
(01-07-2015 10:07 AM)Nigel (UK) Wrote: By the way - are the flickering numbers on the display in slow mode identical to the flickering numbers on a real HP-25? The flickering should resemble the real thing. Eric's code follows the ACT unit to every single flag in the registers which included the display on/off and segment controls. And my code follows his code very closely. Not 100% sure, don't have a really calculator to compare w/. It appears so when I compare w/ a youtube video. I especially like to see the flickering of the HP-33C test prog (9, sin, cos, tan,.... and reverse). It flickering way better than the HP-25C. Reminds me of Xmas lights. I also put considerable thoughts in designing the key-scan, where Eric's code is truthful in that, when you press-n-hold the R/S button, it shows the current program step. I had to dedicate 3 I/O scan lines (from the MCU) in order to do that. /EDIT The gentleman who has a failed digit (+ 3 buttons) just confirmed to me that it's a cold joint and have it resolved by re-flowing the joint w/ a soldering iron. |
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