Denial

I have PAL/NTSC SJLOAD08 sources to my old PC that I have to find in the attic... It's just matter of time :roll: Sounds like some fixes would be required for the pi1541 instead in the first place? I have already patched Mega-Cart (PAL / NTSC) versions for compatibility with pi1541 and am currently...

(....) You limit available RAM by setting 642, 644 and 648 as appropriate and issuing a soft reset: for "+24K", you're already there as +35K is equivalent from BASIC view (RAMx and BLK5 don't count into BYTES FREE here), POKE642,4:POKE644,30:POKE648,30:SYS64818 sets BASIC RAM and screen m...

In case your project will be the only cart connected (no cartridge connector extension) you can eliminate the switch: all ram can be enabled but into the BLK5 your SW boot up asking for the BASIC ram expansion configuration... 0/+3/+24k, consequently you set the memory pointers in accordance with th...

Yes, the SMD chips work to generate: 1) memory extra-8k address lines 2) the enabling U1/U2 signals The BLK1 enable is optional, this permit to doesn't having any jumpers for BLK2,3: BLK1 disabled "cut" the "hight" RAM expansion (there is not continuity from BLK0 to BLK2,3: BLK1=...

It's the main reason why if you try to run a game that requires 3K of extra RAM on a VIC that has 8K extra, it won't work - screen memory is in a different place. This is why on my "SMART RAM" expansion I made the memory configuration selectable with a three position switch in order to be...

Ok, allocazione_di_memoria_con_le_espansioni.jpg this is the unexpanded memory map: http://sleepingelephant.com/denial/wiki/index.php?title=Memory_Map The few RAM on board is organized on 1k sliced areas: RAM0 for the "operating system" RAM4,5,6,7 principally for user use and screen area T...

chysn wrote: ↑Wed Jan 12, 2022 4:08 pm The Jolly Cartridge is awesome work!

Thanks for your words...

Jollycart was born to let us play with "the hardware the software needs", I'm happy it hit the target

Can I replace a 300ns RAM chip with 200ns? The 200ns 2114s much much cheaper and easier to find. Yes, you can. It appear as VA10 remain float (not droved) during the VIC cycle.... check the continuity from the VIC's pin 31 to the char ROM UD7 pin12, but remember: the probes have to be placed on the...

The reference schemes: http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/vic20/index.html 6561 have a little different clock input circuit, only the pin 39 is sensible, pin 38 is internally NC, I had a VIC 20 (PAL) with the non-soldered NC pin (folded under the socket at the factory ...) a...

Thanks for "excellent" and don't worry about my time, the test was pretty fast.
I'm happy that now you can play with new (old) cartridges,
have a good 2022!

I found 3 different 8k EPROMs and filled them with the file you posted, the result is: (my VIC20 is PAL) https://i.postimg.cc/1fXGBw4H/P-20220105-075628.jpg https://i.postimg.cc/PLWYJMFt/P-20220105-075706.jpg https://i.postimg.cc/RNYcDhHz/P-20220105-075748.jpg https://i.postimg.cc/9zJPyJX0/P-2022010...

All appear to be well done,
tomorrow I'll try to find the time to download your file into a 2764 and observe what happens...

I read this only now..... I can confirm that for a 27(C)64 into U1, 8k ROM into BLK5 the settings are: J1: connect "BLK5" with "U1B5" J2 and all others J1 pads have to remain unconnected So your cartridge should be working.... Please, post hi-res pics of front and rear of your no...

At similar price...
may I suggest "jollycart"?
It's not only a PCB, it's also food for SW/HW developer!

viewtopic.php?f=11&t=10235#p114570

Finally with regard to MCes mentioning I/O2 and I/O3 as possible extra RAM: this area is supposed to hold cartridge I/O registers and the only legit user is the cartridge firmware! Any inconsiderate writes (and even reads!) by 3rd party software might result in unexpected behaviour. It's true, usin...