|Re: TDS-256k RAM Card|
Message #5 Posted by Geoff Quickfall on 5 Apr 2011, 11:27 a.m.,
in response to message #1 by aj04062
Someone may correct me but I just googled tds ram card hp48gx and came up with the following link:
256 and 512 TDS cards
I don't know if this is true but I pulled the following quote from the site:
6.24 I've heard about other manufacturer's RAM cards. Will they work?
While some cards may work, there is a chance that you may severely damage your HP48. You should only use cards specifically designed for the HP48. Naturally, HP sells such cards, and some third parties also make cards that will work in an HP48. Some cards work with both the S/SX and the G/GX. Some, however only work on the S/SX, or only on the G/GX. Make sure that the card is designed to work for your version before using it.
The S/SX can only naturally support up to 128K per port. HP sells 32K and 128K RAM cards. However, TDS, using software "bank switches" produces 256K and 512K RAM cards. These bank switching cards do not work in the G/GX series. CMT also makes 128K cards, which work in all HP48 calculators.
While you cannot use the TDS 256K and 512K cards, Sparcom has come out with 256K and 512K cards for the G/GX only. HP also sells 1MB RAM cards that work for G/GX only. The G/GX is able to accept a 4MB RAM card, but none are on the market at this time.
It may be that your card will not work, also try the card in slot two.
google "256K tds ram card hp48gx" and review the use of pinit and pinvar.
or wait for a 48GX expert, I have 4 and one with a 512K TDS card (see above post) and a 1MB card (HP) but I am by no means an expert 48GX user, I just fix them occasionally ;-)