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And what about the new one? Hopefully it's in good, working condition. That way, you can just hold on to the other one as a "parts unit".
...well, at least in the 40 columns mode; I've restarted the CPM mode leaving the "80 colums mode" key pressed, and I was not able to write anything... I had the computer connected to the TV by the RF cable...
I will keep the wrong one for parts, although I am not sure what parts I could use from it if the "good" one becomes faulty.
I'll take a lood at the mainboard when I've got five minutes, and check Ebay for them.
Anyway, I have just now opened the faulty C128D, and seen these two chips:- U32 socket: a white sticker on the chip with mechanographied writing says "315078-02 / W" and "C128 Ker. Din".- U34 socket: "318022-02", "1986 CBM" and "0987-01".According to the mentioned Bo Zimmerman's site, the "315078-02" is "The German C128 KERNAL ROM, containing the editor, the Z80 BIOS and the actual KERNAL part. Saved from an EPROM.", which is correct as my faulty C128D is a German computer.The "318022-02" is "Commodore 128 BASIC V7 ROM. 1986 version. Same as 318018-04+318019-04.".So as it's a C128D, the "problem" should be with one or both of these chips, am I right ?
P.S.: SmallCleverDinosaur, as you have mentioned about burning the roms, what class of Eproms could be used to replace those both ? Might the Willem programmer or a Pic programmer be valid ?
- Trying to get a Willem programmer and some Eproms, but obviously I should think other uses I could give to it as it would cost me more money than buying another C128D.
Anyway, can be used the same Eprom type for replacing the two original roms chips noticed ?I mean, if you can use two 27256 ( or two 27c256 ), instead of one 27128 and one 27256.
Anyway, during the checkings today, I've done a failure.... I had left inserted the "International Soccer" cartridge with the C128D on ( the game, as other times, had get stuck at the starting screen ), and I've gone to make somethings.After returning, I've taken off the cartridge, and reinserted it again, realizing almos immediately that the C128D was on !I've no noticed any change in the C128D working ( or non-working ) order after that.Anyway, tomorrow I'll connect the C128D keyboard and try to start the C64 mode, and to run a demo from disk.
Oops... Let's hope you didn't destroy anything in the computer, but sometimes you are lucky
But... I like to investigate and if possible would like to repair the bad C128D ! No surrender ! :-)
Quote from: caren103 on March 01, 2009, 04:24 AMBut... I like to investigate and if possible would like to repair the bad C128D ! No surrender ! :-)That's the spirit! BTW, did you ever try to start the good C128 without the keyboard connected to see how it reacts?
The 315078-02/W is an Eprom, so perhaps it is not an original Commodore chip, and the computer was "upgraded".... I say this only basing it in a C128D motherboard picture I've foung by the Internet.
The U36 socket is empty.