Path: utzoo!censor!geac!torsqnt!lethe!yunexus!ists!helios.physics.utoronto.ca!news-server.csri.toronto.edu!cs.utexas.edu!samsung!rex!uflorida!cs.fau.edu!ralpho From: ralpho@cs.fau.edu (Ralph P Carpenter) Newsgroups: comp.sys.apple2 Subject: Re: Apple IIc Message-ID: <1991Jan15.195737.16328@cs.fau.edu> Date: 15 Jan 91 19:57:37 GMT References: Reply-To: ralpho@acc.fau.edu (Ralph P Carpenter) Organization: Florida Atlantic University, Boca Raton Lines: 42 In article sehrlich@lynx.northeastern.edu writes: >[...] >I have heard that there were different versions >of the IIc that Apple put on the market. And that each version >did certain things just a bit differently that the other version. >[...] You can inspect the value stored at memory address $FBBF (64,447 decimal) in order to find out which version of the Apple//c you have. From Applesoft Basic ("]" prompt), you can do: ] PRINT PEEK (64447) From the Monitor ("*") prompt, you can do: * FBBF The value you get back is the ROM version number. The basic and most meaningful differences are: FF 255 Original //c -- boat anchor 00 000 adds support for 3.5" Unidisk drives 03 003 adds expanded-RAM support 04 004 fixes bugs in expanded-RAM support 05 005 Apple //c+ Some (all?) of the original (ROM FF) machines have a defective crystal that prevented their modem port from operating correctly at speeds in excess of 300 bps... A few years back, we ordered five or so machines for some of our faculty to use at home -- all but one were ROM FF and had the defect :-( One was a ROM 03 -- guess who got (has) that one? :-) Fortunately, Apple dealers (are supposed to) replace the bad crystal free-of-charge. Hope this helps. -- | Ralph P Carpenter | InterNet: Ralpho@acc.fau.edu | Blake's 7: | | Sr Programmer/Analyst | Bitnet: Ralpho@FauVax | The | | Florida Atlantic Univ | Ci$: 74015,644 GEnie: Ralpho | Motion | | at Boca Raton | Vox: 407/367-2616 Fax: -2749 | Picture |