Ultimem BLK6
Posted: Wed Dec 20, 2017 12:12 pm
Hi!
Does Ultimem support RAM at BLK6?
Greetings,
Stefan
Does Ultimem support RAM at BLK6?
Greetings,
Stefan
The Commodore Vic 20 Forum
http://sleepingelephant.com/ipw-web/bulletin/bb/
http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=8800
In the C64, the PLA is responsible for the RAM/ROM mapping. That the mapping is (in part) controlled by the I/O port of the 6510 is more of an insignificant detail here.tokra wrote:or more precisely the 6502 CPU
It's not as if I hadn't entertained that idea once in a while - see the thread "WIP(?): A proposal for a VIC-20 with 60K RAM". That would also allow for RAM "under" the character ROM. With separated access paths for VIC and CPU.groepaz wrote:it would be so nice if you could map the e000-ffff block to ram as you can on c64.... but you cant
... went for this route instead.groepaz wrote:or i could just pop a custom rom into it...
Well, it's possible with mods to the mainboard.groepaz wrote:it would be so nice if you could map the e000-ffff block to ram as you can on c64.... but you cant
i don't really like designing cartridges for specific things either i'd want to use stock setups, for vic20 probably even without using a floppy drive. the only hardware mod i find acceptable is RAM expansion (since those were incredibly common anyway).Of course it's not all that sensible to modify the mainboard if the intended result could also be achieved by an external solution.
Honestly, where ? The OP only said...groepaz wrote:what about "no interested in hw mods" was not clear? OBVIOUSLY you can achieve all kind of things that "do not work" by modding the hardware.
That would be 'no'. I don't see any post from the user asking the original question specifying he(she) is not interested in HW mods. It remains the only solution I know of. BTW, I know I wouldn't do it.Does Ultimem support RAM at BLK6?
AFAIK, the vast majority of people using RAM expansion on their VIC-20 do it with a cartridge, not a hardware mod.i don't really like designing cartridges for specific things either i'd want to use stock setups, for vic20 probably even without using a floppy drive. the only hardware mod i find acceptable is RAM expansion (since those were incredibly common anyway).
you did not reply to the OP, you replied to ME.Honestly, where ? The OP only said...
thanks, captain obviousAFAIK, the vast majority of people using RAM expansion on their VIC-20 do it with a cartridge, not a hardware mod.
I was replying to that specific post from you.groepaz wrote:you did not reply to the OP, you replied to ME.
My mistake...i am not really interested in solutions that involve modding the hardware though.
Nice tryMike wrote:I have a strong suspicion *why* you are asking this.
I'd suppose not having room for a jump table at a certain address would be the least problem in attempting a port of GEOS.polluks wrote:I was thinking about a GEOS implementation but it would require a jump table at $C000
Not really, without this RAM area you will lose compatibility, see Apple II GEOS. Stupid design decision.Mike wrote:I'd suppose not having room for a jump table at a certain address would be the least problem in attempting a port of GEOS.