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- Path: sparky!uunet!paladin.american.edu!gatech!emory!ogicse!cs.uoregon.edu!news.uoregon.edu!nntp.uoregon.edu!stevev
- From: stevev@miser.uoregon.edu (Steve VanDevender)
- Newsgroups: comp.sys.handhelds
- Subject: Re: Wanted:RAM cards
- Message-ID: <STEVEV.93Jan9005027@miser.uoregon.edu>
- Date: 9 Jan 93 08:50:27 GMT
- Article-I.D.: miser.STEVEV.93Jan9005027
- References: <C0I9Dp.5GH@news.iastate.edu>
- <2b4e20e6.5081.1comp.sys.handhelds.1@hpcvbbs.cv.hp.com>
- Distribution: inet
- Organization: University of Oregon Chemistry Stores
- Lines: 28
- NNTP-Posting-Host: miser.uoregon.edu
- In-reply-to: akcs.dmankin@hpcvbbs.cv.hp.com's message of 9 Jan 93 01:40:01 GMT
-
- In article
- <2b4e20e6.5081.1comp.sys.handhelds.1@hpcvbbs.cv.hp.com>
- akcs.dmankin@hpcvbbs.cv.hp.com (David Mankin) writes:
-
- I was thinkinging about buying ram for my hp48, put i want a certain
- answer for this question first:
- Howmuch ram can the HP-48SX access? Can it hold 256K ram cards in each
- of it's slots? or it 128K the limit?
-
- The HP 48 can address only 128K bytes of memory per card slot.
- Cards that contain more than 128K of memory divide it into
- separate 128K banks that are switched under software control.
- Such cards are useful but they cannot generally be merged into
- main memory (you would have to free that merged bank in that card
- before you could access the other banks on the same card). Most
- people who use the 256K or 512K cards have recommended having a
- merged 128K card in the other card slot.
-
- The total address space of the Saturn is 512K bytes (or 1M
- nybbles). However, the built-in 32K of memory is mapped over the
- top of 32K of ROM at address #70000, or can be mapped instead to
- #F0000; this allows the total simultaneously accessible RAM to
- total 288K (32K standard, plus two 128K cards).
- --
- Steve VanDevender stevev@greylady.uoregon.edu
- "Bipedalism--an unrecognized disease affecting over 99% of the population.
- Symptoms include lack of traffic sense, slow rate of travel, and the
- classic, easily recognized behavior known as walking."
-