PET 2001 corrections

9", 8" the Commodore ads said 9" display... But of course there is only about 8" showing... reminds me of that class-action monitor suit, (Our agency will make $9 for the three monitors it bought a few years back, in 2000, I still have the refund cards.) the 12" models used the new video display chip (and newer motherboard w/speaker) for which only 4.0 BASIC was coded, only the 4000 series. [snip] they were SANYO decks, no tape eject button, you had to lift the lid, I have two (one in the PET and one external!) Black C2N, custom case, no counter. Nice looking deck too, I called that design the 'brick' datasettes, the later cream 'brick' added a counter but they wern't as reliable as the black ones. The best are the (VIC/64 era) low-profile 1530s. Nice units! I got the 2001-8K from my Spring 1980 Commdoore Product Catalog, listed were: PET 2001-8K Integeral cassette, upgrade (they list as 3.0) ROMs PET 2001 Professional Computer (these were the N series, 8N, 16N, and 32N) graphics full-sized keyboard. CBM 2001 Business Computer (non-graphics keyboard, Upgade ROMs, etc.) listed as 16B and 32B CBM 8000 Business Computer (Available June 1980) 80 columns, 4.0 ROMs listed as 8016 and 8032 [snip] [snip] Commodore was not a wasteful company (at least in the beginning,) maybe they used an older label?? I would not put it past em. Never saw a 3000 in my neck of the woods, though I did see pictures (like in the PET Personal Computer Guide, etc.) I think they were more abundant in Canada and the UK. [bzzz] Read above, the 8000 was the first 12" model. The difference between a 4000 and an 8000 is an extra k of screen RAM and the video startup code in one of the ROM chips. The 64k expansion board came later and was fully integrated lastly in the 8296 (mainly european release) Yep, darned annoying if you like the graphics symbols. The 4000/8000 series also extended the line height by a pixel or two (thanks to the new VDC) which left a gap between lines, can be gotten around by printing CHR$(142) -uppercase, no gaps- and then poking 59468,14 -set back to lower case-. It was a routine in the screen printing code doing it. I think three or four graphics symbols were readily unavailable, (you would have had to print them out with CHR$()s and then build your program lines around them) two of which I really liked to use, that PET (at school) did't get used much by me... (=P) [clip alot of tech stuff] > And that was the second problem. Later PETS swapped lower and upper > case letters. So now ASCII codes 65 and up, which still mapped onto > screen codes 1 and up, gave LOWER case letters, but you pressed SHIFT > for upper case. However the OS and BASIC (one and the same, really) > treated unshifted as letters, and shifted as meaningless graphics > characters, whichever mode you were in. > Confused? It is, isn't it! One of the Original to Upgrade ROM fixes... You knew the programmer had an old ROM PET when the case in their text was inverted. > >> ROMs (which I think came out in 1979?) fix both of those things. > About then. The monitor - hex only - replaced diagnostic routines in > the original ROMs. A listing was actually given in the original PET > manual, but I couldn't get it to work whenever I typed it in... I have it on a Commodore tape and the diagnostic tape too! > >> I don't have a machine with BASIC 4.0, so I don't know how that starts > It says "COMMODORE BASIC 4.0" but I can't remember whether between *** or > ###. *** COMMODORE BASIC *** Original ROM ### COMMODORE BASIC ### Upgrade ROM *** COMMODORE BASIC 4.0 *** 4.0 ROMs > >> Upgrade ROM machines also have a Microsoft easter egg in them > >> whcih is missing from the original ROMs.) > Indeed. Type WAIT 6502,100 and you get a screen full of MICROSOFT! Short lived?? - it seemed to be around for a few years to me... I go by Original, Upgrade, small screen 4.0, and large screen 4.0, and 80 column 4.0. There were enough differences in the small and large screen 4.0 ROMs to keep some 4.0 games from working on large screen PETs. > > Only the original ROMs start up with ***; all of the later ones used ###. > That clears up my mystery above. Thank you. [bzzzz] *** were used in 4.0 too, but at least they did add 4.0 to the message. > >> It might also be important to mention that the PET has a timer that > >> operates in real time. And it has the same character set(s) as the VIC-20 except for the british pound symbol which replaced the PET's back-slash (\) the 64 set was 'pudgyier' to reduce video artifacting on TVs but you can't switch between the upper/lower-case text character > >> set and the upper-case/graphics set without issuing a POKE command. (Was > >> it 49512,12 and 49512,14? My memory is rusty.) > Hope this clears up some misconceptions. and that is why I made the PET FAQ! ;) -- -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- Larry Anderson - Sysop of Silicon Realms BBS (300-2400bd) (209) 754-1363 Visit my Commodore 8-Bit web page at: http://www.goldrush.com/~foxnhare/commodore.html -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-