Hi Philip: I installed your ROM; the character set itself looks pretty good, but I think the mapping's not quite correct in a few places. For instance, in Katakana mode the numeric pad doesn't have any numbers above 3; also, some of the characters are the same shifted and unshifted. The main alphabetic characters look OK though. I'll send you graphic printouts of the three ROM sets off-list for your perusal. mike ************************************************************************************* ---------- From: Philip Lord[SMTP:email@example.com] Sent: Tuesday, November 24, 2009 7:48 PM To: firstname.lastname@example.org Subject: Re: PET 2001 Fix....WAS: Will pay good money for NON working PET 2001motherboard. Thanks for the reply Marko, Having never actually used a Commodore computer before (yes it's true. I was a Sinclair guy growing up. Sorry) It's a little difficult for me to understand how the characters work. I have installed VICE on my Laptop, but as I don't have a numeric keypad, and therefore the keyboard mapping is all screwey and it's not very usable, especially when trying to understand the keyboard and characters for the PET. Anyway, just as a confirmation...are you suggesting in the second character set, that I should replace the uppercase glyphs with the Japanese, and then replace the the lowercase with uppercase? Phil On Nov 24, 2009, at 10:27 PM, Marko Mäkelä wrote: > On Tue, Nov 24, 2009 at 07:53:33PM +0900, Philip Lord wrote: >> Just a quick follow up, and a question for the list: >> The original character ROM contains two sets of capital letters, >> and on >> set of lower case. Does anyone know why there are two sets of cap >> letters? > > There actually are two 128-char character sets in Commodore 8-bit > computers: > uppercase/graphics and lowercase/uppercase. On models where reverse > characters are not implemented in hardware, the character sets are > 256-char, > but the upper half is the same as the lower half, but inverted. > > In the home computers (VIC-20 and later), you can switch between > these two > character sets by pressing SHIFT and the C= key. If I remember > correctly, > that does not work in the PET. But these control codes should work: > > print chr$(14); rem ctrl-n selects lower/upper-case > print chr$(142); rem shift-ctrl-n selects uppercase/graphics > print chr$(8); rem ctrl-h disables SHIFT+C= > print chr$(9); rem ctrl-i enables SHIFT+C= > > Some graphic characters exist (and are identical) in both sets. These > graphics are what you obtain on the VIC-20 and later when pressing > the C= > key together with a letter key. > >> Presently I have replaced the lowercase letter set with the new >> Japanese >> fonts. Hopefully this was the correct thing to do. A poke 59468,14 >> should >> activate them. However you do lose the lowercase characters of >> course. If >> you believe I have made a mistake, please let me know. > > I am just guessing, but I would expect that the original font > preserved > positions 1 to 26 (a to z) intact. Those would correspond to the > lower case > letters in the lower/uppercase character set. If the Japanese > glyphs are > put where the uppercase letters used to be (65 to 138), then it > would make > sense to replace the lowercase glyphs with uppercase ones at 1 to 26. > > For what it is worth, I found a homebrew EPROM in a VIC-20 that had > replaced > some of the C= graphics characters with accented letters. The > official > Swedish/Finnish modification had the chars at [\]. > > Marko > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2009-11-25 08:30:33
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