Post Reply 
TULIP4041 Startup Question
10-24-2024, 04:17 PM
Post: #13
RE: TULIP4041 Startup Question
In the HP-41C/CV/CX Service Manual schematic, the FI line comes straight from the CPU itself. Interestingly my CX keeps FI at about battery voltage even when the calculator is off. It drops to ground only when I remove the battery.

Does this make sense? Can someone with a TULIP measure the voltage for FI right at the module adapter? I'd love to know if this is just a pull-up that is always powered.
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: TULIP4041 Startup Question - rocket.scientist - 10-24-2024 04:17 PM



User(s) browsing this thread: 7 Guest(s)