Re: Super VIC20 motherboard! (PAL) MOBO
Posted: Wed May 04, 2016 10:58 am
Impressive spaghetti construction
The Commodore Vic 20 Forum
http://sleepingelephant.com/ipw-web/bulletin/bb/
http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=7675
Any Wonder progress ?MCes wrote:Now "WonderVIC" is under development: it's a "SpaghettiVIC"
Code: Select all
continuous pressing of RESTORE will generate a HW RESET,
during HW RESET function keys could select RAM expansion
_____________________________________________________
| | 3k RAM | 16k | 8k | 2K | 8k |
| F5 F3 F1 | 1+2+3 | BLK1+2 | BLK3 | I/O2+3 | BLK5 |
|__________|________|________|______|________|________|
| -- -- -- | -- | -- | -- | -- | -- |
| -- -- ** | ** | ** | -- | -- | -- |
| -- ** -- | ** | -- | -- | -- | -- |
| -- ** ** | ** | ** | ** | -- | -- |
| ** -- -- | ** | ** | ** | -- | ** |
| ** -- ** | ** | ** | ** | -- | R.ONLY |
| ** ** -- | ** | ** | ** | ** | ** |
| ** ** ** | ** | ** | ** | ** | R.ONLY |
|__________|________|________|______|________|________|
(R.ONLY = Read only: ROM emulation)
F7= second kernal (JDos + cartridge autostart disabled)
I am happy with the VIC-20 I bought from you MCes but how do I install JiffyDOS ?eslapion wrote:PAL VIC-20cr with extra integrated 3k/16k RAM received!
Works perfectly well too.
Thank you MCes.
Finally will be able to play Frogger the proper way, as well as Robotic Liberation.
Hi Barney,Barney wrote:Out of curiosity, what is your cost to have a board modded like this? I'm definitely interested.
Hi Mike,Mike wrote:Do you have any ambitions to include my VFLI mod in the next iteration? Both the internal 3K RAM expansion (which is visible for the VIC chip), and the colour RAM expansion (from 1Kx4 to 16Kx4) could be made switchable, for those concerned about 100%+ compatibility. *)
Inside ROM could be the jiffydos (for future improvements....),eslapion wrote:I am happy with the VIC-20 I bought from you MCes but how do I install JiffyDOS ?
That is not going to work with the current display routine for VFLI images.MCes wrote:The register LS273:
it's an "only writeble" "VIA4" ($914x), and on RESET it will be "$00".
LS273 Bit0,1,2,3 are for paging the Color Ram (RAM will be 8bit deep, it can help other programs to hide/store datas/SW).
Bit4: enable/disable the internal +3k Ram (VIC recognizable)
Bit5: enable 16K RAM in BLK1+2
Bit6: enable 8K RAM in BLK3
Bit7: enable 8K RAM in BLK5 (and switch off +3K RAM)
Ok,Mike wrote:That is not going to work with the current display routine for VFLI images
It is not only sufficient to change the colour RAM bank, also 3 VIC registers must be changed on each raster.MCes wrote:What do you think about a color bank register that it will be auto-increased each raster line by hardware?
I think that your "0% CPU" will be a too radical modify, it's better to put a C64 VICII on external cartridge.......Mike wrote:I already had a slightly more radical approach in mind, allowing for the display of a VFLI image with essentially 0% overhead.
If the problem is that a VIC 20 modified VLFI cannot be used (for example) for RS232 communications because this kind of SW have to use user-port (and this become a switch of color bank with problem to normal display of a common VIC20 default screen..),Mike wrote:So people could still have one VIC-20 for RS232, and the other one for a colourful display (<- but that's not the only thing doable with the mod. )