Re: final cartridge for vic 20 (With Super CPU!) ;)

Hi guys,

Love watching all this R&D in real time.

Love the idea of the Final Cart version for the Vic-20.

I've been meaning to order from Mr Brain for some time now.
I'll be sure to add one of these to the list when they are available.
AU$ is too weak currently (69 cents) but hopefully in the future it will 
recover some.

Wondering about adding a faster CPU to the mix? I would think such 
things are quiet cheap now.
Or even just a spot on the board for it so a user can add it later if 
wanted.

I know it's the whole Super CPU saga of needing support firmware but if 
the hardware exists perhaps people will write for it later?

Just an idea. :)

Keep up the great work!


~Ken
.-.-.

On 25/09/2015 10:20 AM, Terry Raymond wrote:
> Wow I didnt realize it was that many years ago either where do they go.
>
> Terry Raymond
>
> On Thursday, September 24, 2015, Pasi 'Albert' Ojala <a1bert@iki.fi 
> <mailto:a1bert@iki.fi>> wrote:
>
>     On 09/24/15 21:48, Anders Carlsson wrote:
>
>         Pasi Ojala wrote:
>
>             However, if the memory were visible to VIC-I
>
>
>         Doesn't it take internal modifications to make any sort of
>         memory available to the VIC-I, or can it somehow be achived
>         through the expansion bus?
>
>     Yes, and it was one thing xvic had wrong at some point.
>
>     There is VR/W signal on the expansion port.
>
>     Now, where are the schematics...  Here, but where's the cartridge
>     port..
>
>     Only CA0 to CA15 appear in the cartridge port, not VA0 to VA15.
>     65245 buffers allow CA (6502 address) to drive VA (VIC-I address)
>     and it is strictly one way. The internal RAM is connected to the
>     VA bus. So, VIC-I can only access internal memory, not any
>     expansion memory.
>
>         Can the VIC-I read from memory connected to I/O blocks 2 and 3
>         ($9800 - $9FFF if I recall correctly) if that memory is
>         connected from the cartridge?
>
>     VIC-I can't provide the address. Another buffer connects CD (6502
>     data) and BD (VIC-I data) buses. This one had direction controlled
>     by CR/W, and while CR/W is high during video access, VIC-I can't
>     see the data on the CD bus (cart port). Unless you force the CR/W
>     low from the cartridge port...
>
>
>         I believe the VIC-20 scene in latter years has developed a
>         couple more image formats since Pasi's format 15+ years ago,
>         but I believe those are even more CPU intensive with increased
>         FLI like colour resolution.
>
>     Time flies... :D
>
>     -Pasi
>
>
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>
>
>
> -- 
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