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- This excellent information was rescued from oblivion on the *FlagShip*'s
- message base. Hope it will be helpful to any who need it:
-
- ************
- Topic 70 Sun May 29, 1988
- W.DRESCHER at 16:03 EDT
- Sub: New C64C bug
-
- S The new sound chip in the 64C is not compatable with some software, .
- 10 message(s) total.
- ************
- ------------
- Category 1, Topic 70
- Message 1 Sun May 29, 1988
- W.DRESCHER at 16:08 EDT
-
- I have found that the new 64C has a new motherboard and seems to have a
- different sound chip . Programs like THE THREE STOOGES and othr ers that
- have digitized sound do not work properly. Has anyone found this problem with
- other games? I really would like to know why Commodore screwed up the 64C. I
- sold my 'old' 64 for the new style keyboard, only to find I traded 'down' to
- a computer that is not compatable with some of my software. Wayne
- ------------
- Category 1, Topic 70
- Message 2 Tue May 31, 1988
- D.SCHMOLDT [Dave/SysOp] at 00:49 EDT
-
- Wayne,
-
- A member of our user group put an article in the last newsletter comparing
- the chips in the old and new 64s. They are almost completely different. He
- wasn't even able to find a SID chip in the 64c, it was disguised so well ....
- or combined with other chips.
-
- I hadn't heard of any compatibility problems yet. What does the 64c do (or
- not do) when it runs into digitized sounds? Does it not even play them, or
- do they just sound strange? I can't believe Commodore would make any
- modifications to the SID chip addresses and such.
-
- Dave
- ------------
- Category 1, Topic 70
- Message 3 Tue May 31, 1988
- W.DRESCHER at 22:45 EDT
-
- The digitized sound (as in 3 Stooges) is very low in volume compared to the
- music. I can hardly hear the digitized sound when the music is up a at
- a good volumn me. The at ruins this particular game. In the h 'hit' and
- 'slap' part of the game you need to hear the sound and you can't unless you
- crank the monitor all of the way up. In TEST DRIVE the DI digitized sound of
- soung d of the car in the intro is lost....no biggy, but I keep wondering
- what else I will be missing in the future. Wayne......thanks for the reply,
- it was interesting
- ------------
- Category 1, Topic 70
- Message 4 Wed Jun 01, 1988
- D.SCHMOLDT [Dave/SysOp] at 01:18 EDT
-
- C-64 and 64C
- --Two Different Critters--
- by Gary Brinton, Commo-Hawk User Group, Cedar RApids, Iowa
- According to some articles I've read, I tended to believe that the 64C
- is little more than a C-64 in a new wrapper. Although both machines
- operate the same, there are significant differences in the chips. Planning
- on buying one of those $24.95 super kernal chips? If you have a 64C,
- forget it. There may not be a discrete kernal chip in your machine.
- Certainly it's not the same chip that's in the C-64. If you're thinking
- about adding another 6581 SID chip to your 64C to play stereo music with
- the new SidPack software, forget that too. There's no 6581 in there. You
- can't follow any of the existing instructions on how to alter your machine.
- Commodore took out many of the cheap (jelly bean) chips like the 74LS
- series and combined them into big, and probably super expensive chips. One
- such is the 251715-01, a 64 pin monster. They took out so many that they
- were able to shrink the board width by an inch and 1/2. Also gone is the
- 6510 microprocessor. Anyone know where it's buried?
- What this means from the service angle is that when a large chip goes
- bad on the 64C, that chip probably isn't available from places like Jameco.
- You may have to go to Commodore directly. And, if you've invested $19.95
- in a Howard Sams diagram for the C-64, it won't work for the 64C. There
- isn't any place I know of where you can get a complete diagram of the 64C.
- Maybe Commodore has it?
- On the positive side, fewer chips means less time spent hunting down
- bad ones. Finding which chips do what, is another matter.
- The following is a chip list in both machines. I don't know what each
- of the 64C chips does, but from the list, you can get an idea of the
- integration.
- 64C C-64
- (Big Chips)
- 6526 (2) 6526 (2) (Interface)
- 901225-01 901225-01 (Char Rom)
- -------- 901226-01 (Basic Rom)
- -------- 901227-02 (Kernal Rom)
- -------- 906114-01 (PLA)
- -------- 6510 (Micro Processor)
- -------- 6567 (Video)
- -------- 6581 (SID)
- 8500 -----------
- 8560 -----------
- 8562 -----------
- 251715-01 -----------
- 251913-01 -----------
- (Small Chips)
- 7406 7406
- MC14066 MD14066
- MN2114 2114L-30L
- 74LS14 --------
- 74LS508 --------
- 86458N --------
- 8701 --------
- 8631FU001 (2) --------
- ------ 74LS08
- ------ 74LS74
- ------ 74LS139
- ------ 74LS193
- ------ 74LS257 (2)
- ------ 74LS258
- ------ 74LS373
- ------ 74LS629
- ------ HM4864 (8) (Ram)
- ------ NE556
- ------ MC4044P
- I didn't include the RF modulator chips, because I didn't want to open
- the boxes.
- If anyone knows where we can get more information about the 64C, please
- let me know or print it in the next newsletter. The articles I've read
- contain none of the above information.
- -G Brinton
-
- ------------
- Category 1, Topic 70
- Message 5 Thu Jun 02, 1988
- W.DRESCHER at 07:31 EDT
-
- Also, try the game TEHTH FRAME. The ball sounds like a 'jet' rather than a
- bowling ball going down the lane. Must be a filter change in the 64C
- the 64C. Wayne
- ------------
- Category 1, Topic 70
- Message 7 Thu Jun 09, 1988
- W.DRESCHER at 07:34 EDT
-
- Well, I fixed my problem, sort of. I found a friend with an old 64 and he
- traded motherboards with me. It took some work, but I put the old board in my
- 64C case. It's too bad I had to suffer just to make my 64 compatable with
- it's own software. I wrote to C= about my (our) problem but I don't really
- expect an answer. Does anyone know what address would be the best to write C=
- about this rticular problem? Maybe they will come out with a 'new' 64 for us
- to buy. They'll probably call it 'Classic Commodore 64'! Wayne
- ------------
- Category 1, Topic 70
- Message 8 Sat Jun 11, 1988
- E.R.FLINN at 23:22 EDT
-
- There is, it seems, yet another complication here. I have an early 64C,
- and have opened it and found it to have a full-size motherboard, and the
- traditional assortment of 64 chips. It seems that only the later 64Cs have
- the half-size board and the conglomerated chips. My 64C is also held
- together with obnoxious Torx screws, but these yielded easily to a tiny allen-
- head driver I had lying around.
- The claims that the 64C is identical in all internals to the 64, made at
- the time the 64C was first released were, apparently, true at that time.
- <ed>
- ------------
- Category 1, Topic 70
- Message 9 Sun Jun 12, 1988
- W.DRESCHER at 23:09 EDT
-
- Yes, I HAD a new 64 with the old motherboard in it. It blew out on on me,
- so I had to bring it back to the store for a new one. I should hac ve stuck
- with it because I got a new type motherboard in return I hope C= will fix
- the sound problem Wayne
- ------------
- Category 1, Topic 70
- Message 10 Tue Aug 02, 1988
- W.DRESCHER at 07:35 EDT
-
- Well, I heard from Commodore, finally They told me I must have a bad sound
- chip and I should go to the place that I got the computer and get a new one.
- Well, since I had the problem I got 2 different ones and they both have the
- same problem The THREE STOOGES game will NOT work right. The digitized
- sound can barely be heard. Even many digitized programs from GEnie won't
- work. C= told me they tried their 128's with digitized sound and it processed
- fine. The sound at the beginning of TEST DRIVE is completely non-existant.
- The bowling ball in TENTH FRAME sounds like an F-15 jet fighter when it rolls
- down the alley. If anyone with a C64C can add to his list (this list) any
- software that doesn't work properly or even write to C= yourself I would
- appreciate it. Wayne
- ------------