[HP-48GX] Expansion slot info needed

[Kikicat123]

(10-27-2023 12:05 PM)rprosperi Wrote:  Retrotronik in Portugal makes and sells cards in 128KB, 1MB and (eventually) 2MB sizes, at quite acceptable prices:

https://retrotronik.com/
Note that sometimes it takes a while to get replies, so be patient, you will get a reply.

If you proceed to making a card I strongly suggest you get your hands on a actual card (buy a dead one) as the keying for the channel where the connector mates deep within the slot is neither documented well nor easily described. This unexpected aspect has foiled more than one DIY-er attempting to make 48 cards.

Good luck

I do still plan to make a card, mainly for the novelty of having made it myself. Ill be sure to take this into account - I have yet to find a dead card I can buy to use as reference. I'll see if I can get one of those Retrotronik cards, otherwise I think I'll be forced to find something else for much more expensive.

Thanks a ton for the info!

Jeff_Birt Wrote:There are multiple RAM card projects with gerber files here: https://www.hpcalc.org/hp48/docs/misc/

Thanks for the link, I'll take a look.