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HP41C with Rp Pico attached
12-02-2023, 10:49 AM
Post: #47
RE: HP41C with Rp Pico attached
(12-02-2023 10:25 AM)Tinue Wrote:  Thank you for the video, I found it very interesting. How do you interface electrically with the HP 41? I assume it is a 5V device, while the RP2040 uses 3.3V.
Just simple level shifters. I have a few interfacing boards left from my MLDL2000 activities. I use a CD4050 for downshifting, and an HCT125 for upshifting to 6V (HP41 is around 6V). For shifting up to 6V a 40109 would be a bit better.

Regards, Meindert
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Messages In This Thread
HP41C with Rp Pico attached - blackjetrock - 05-31-2023, 06:27 AM
RE: HP41C with Rp Pico attached - ThomasF - 05-31-2023, 08:01 AM
RE: HP41C with Rp Pico attached - ThomasF - 06-01-2023, 05:53 AM
RE: HP41C with Rp Pico attached - ThomasF - 06-01-2023, 02:22 PM
RE: HP41C with Rp Pico attached - ThomasF - 06-22-2023, 11:31 AM
RE: HP41C with Rp Pico attached - ThomasF - 06-22-2023, 01:10 PM
RE: HP41C with Rp Pico attached - ThomasF - 06-22-2023, 08:13 PM
RE: HP41C with Rp Pico attached - ThomasF - 07-06-2023, 05:00 PM
RE: HP41C with Rp Pico attached - ThomasF - 07-06-2023, 06:41 PM
RE: HP41C with Rp Pico attached - LEDfan - 07-08-2023, 07:57 PM
RE: HP41C with Rp Pico attached - ThomasF - 07-13-2023, 07:16 AM
RE: HP41C with Rp Pico attached - ThomasF - 07-13-2023, 11:19 AM
RE: HP41C with Rp Pico attached - ThomasF - 07-25-2023, 03:07 PM
RE: HP41C with Rp Pico attached - ThomasF - 07-25-2023, 03:18 PM
RE: HP41C with Rp Pico attached - ThomasF - 07-26-2023, 11:45 AM
RE: HP41C with Rp Pico attached - ThomasF - 09-07-2023, 06:20 AM
RE: HP41C with Rp Pico attached - ThomasF - 09-07-2023, 01:48 PM
RE: HP41C with Rp Pico attached - ThomasF - 09-08-2023, 06:27 AM
RE: HP41C with Rp Pico attached - Tinue - 12-02-2023, 10:25 AM
RE: HP41C with Rp Pico attached - MeindertKuipers - 12-02-2023 10:49 AM
RE: HP41C with Rp Pico attached - Tinue - 12-02-2023, 11:26 AM
RE: HP41C with Rp Pico attached - Tinue - 12-02-2023, 01:15 PM
RE: HP41C with Rp Pico attached - brouhaha - 12-02-2023, 05:25 PM
RE: HP41C with Rp Pico attached - ThomasF - 12-05-2023, 03:05 PM
RE: HP41C with Rp Pico attached - PeterP - 02-22-2024, 09:23 PM
RE: HP41C with Rp Pico attached - floppy - 03-15-2024, 11:16 AM
RE: HP41C with Rp Pico attached - brouhaha - 08-07-2024, 04:24 AM



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