LegendBreath
- May 22, 2005
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- May 22, 2005
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Hi,
What if I take a Vic-20 and change the CPU (6502) to a 6507 CPU?
What if I take a Vic-20 and change the CPU (6502) to a 6507 CPU?
Hi LegendBreath
this takes me back a bit.. but according to websearch
Yes, they are identical. The 6507 package was created strictly
to save space on the PCB, in those days it did not make sense
to create a new die and mask for such an "improvement" since this
was much more expensive than the package design. The 6507 in
a 2600 should react the same way to undocumented opcodes as the
6502 in a C64.
Does that help?
Ed
this takes me back a bit.. but according to websearch
Yes, they are identical. The 6507 package was created strictly
to save space on the PCB, in those days it did not make sense
to create a new die and mask for such an "improvement" since this
was much more expensive than the package design. The 6507 in
a 2600 should react the same way to undocumented opcodes as the
6502 in a C64.
Does that help?
Ed
LegendBreath
- May 22, 2005
- 79
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- May 22, 2005
- Messages
- 79
Ok thanks, well do you know any "hacks" I could do on my Vic? (I'm boored 
)
)Hi LegendBreath
I'm afraid my Vic has gently rusted out in the garage, maybe there's some way of recycling it as a doorstop, ah! technology moves on, in an odd sort of way I'd be happier playing with my Vic, PET, Dragon, Atari or Sinclair (Yes, i've still got them all) than Visual Studio .NET but I have to eat
Ed
I'm afraid my Vic has gently rusted out in the garage, maybe there's some way of recycling it as a doorstop, ah! technology moves on, in an odd sort of way I'd be happier playing with my Vic, PET, Dragon, Atari or Sinclair (Yes, i've still got them all) than Visual Studio .NET but I have to eat
Ed
LegendBreath
- May 22, 2005
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- May 22, 2005
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Lol, yeah it's fun to play with old things
And, someones know if it's possible that my CPU on my VIC-20 is a 6522??? Because, there is MOS 6522 and no 6502 chip on my board...
And, someones know if it's possible that my CPU on my VIC-20 is a 6522??? Because, there is MOS 6522 and no 6502 chip on my board...
The C64 is using a 6510
One of the best places (I think) for Commodore stuff is: http://www.funet.fi/pub/cbm/
Miss my VIc-20 - it has alzhimers :'( - a known problem in old VIC's...
But all my C64, spectrum, lambda, amiga, spectra video, sort, amstrad, new brain..... still works 8)
One of the best places (I think) for Commodore stuff is: http://www.funet.fi/pub/cbm/
Miss my VIc-20 - it has alzhimers :'( - a known problem in old VIC's...
But all my C64, spectrum, lambda, amiga, spectra video, sort, amstrad, new brain..... still works 8)
LegendBreath
- May 22, 2005
- 79
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- May 22, 2005
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- 79
Well, do you know which chip the VIC-20 use?Bikerman said:The C64 is using a 6510
One of the best places (I think) for Commodore stuff is: http://www.funet.fi/pub/cbm/
Miss my VIc-20 - it has alzhimers :'( - a known problem in old VIC's...
But all my C64, spectrum, lambda, amiga, spectra video, sort, amstrad, new brain..... still works 8)
LegendBreath
- May 22, 2005
- 79
- Joined
- May 22, 2005
- Messages
- 79
Yeah the CPU thanksBikerman said:
Here are the schematics http://www.funet.fi/pub/cbm/schematics/computers/vic20/index.html
there is a CPU running at 2 MHz you can out stright in (can't remember the name), you don't need to change the x-tal (6502DX2 ?? 8))
when the VIC was hot you could buy a 4 MHz upgrade for it !!!, the problem with just changing the x-tal is your timing gets screwed, the timer and disk drive woun't work any more
there is a CPU running at 2 MHz you can out stright in (can't remember the name), you don't need to change the x-tal (6502DX2 ?? 8))
when the VIC was hot you could buy a 4 MHz upgrade for it !!!, the problem with just changing the x-tal is your timing gets screwed, the timer and disk drive woun't work any more