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HP-25 Co-luminous segments
04-10-2022, 12:23 AM (This post was last modified: 04-10-2022 12:27 AM by teenix.)
Post: #24
teenix Offline
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RE: HP-25 Co-luminous segments
Attached is a scope image from a HP-25.

Top is connected to the segA output of ROM0 showing a full display refresh with 77." on the display and the [7] key held down.

Bottom is connected to ACT pin 7 (key column 3) showing a full display refresh with the 7 key down.

cheers

Tony


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Messages In This Thread
RE: HP-25 Co-luminous segments - teenix - 04-07-2022, 06:25 AM
RE: HP-25 Co-luminous segments - teenix - 04-07-2022, 11:04 AM
RE: HP-25 Co-luminous segments - teenix - 04-08-2022, 12:01 AM
RE: HP-25 Co-luminous segments - teenix - 04-08-2022, 06:35 AM
RE: HP-25 Co-luminous segments - teenix - 04-08-2022, 07:12 AM
RE: HP-25 Co-luminous segments - teenix - 04-08-2022, 01:11 PM
RE: HP-25 Co-luminous segments - teenix - 04-08-2022, 02:38 PM
RE: HP-25 Co-luminous segments - teenix - 04-08-2022, 10:50 PM
RE: HP-25 Co-luminous segments - teenix - 04-09-2022, 09:22 PM
RE: HP-25 Co-luminous segments - teenix - 04-10-2022 12:23 AM
RE: HP-25 Co-luminous segments - teenix - 04-11-2022, 06:40 PM



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