Thanks to Museum of HP Calculators Forums:
HP 15C Collector's Edition (SAMBA software and the HP 15C Connectivity cable required)
* Key bounce issue is addressed
* Decimal display mode in HP 16C mode corrected
Links:
Forum Post: https://www.hpmuseum.org/forum/thread-22078.html
BIN file download page: https://hpcalcs.com/download/
SAM-BA Software: https://www.microchip.com/en-us/development-tool/sam-ba-in-system-programmer#Software
Where to buy the required cable:
Calculator Store (Europe): https://www.thecalculatorstore.com/
HP Supply (United States/Canada, per forum, available in August 2024): https://hpofficesupply.com
Swiss Micros DM42 - v.3.23 DCMP 3.25
* Software updated to match Free42 firmware 3.1.8
Info about Free42: https://thomasokken.com/free42/
Swiss Micros Post: https://forum.swissmicros.com/viewtopic.php?p=33058#p33058
Firmware Page: https://technical.swissmicros.com/dm42/firmware/
Eddie
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