Denial

aeb wrote: I don't think there's a big enough standard cartridge format, any non-standard banking would be out of question. Also, there's self-modifying code and small workspaces in middle of the code blocks, so it's not feasible to turn it into a ROM image just like that. A cartridge with a FRAM w...

This is the cap that Jon is talking about. You must install it.

Back to the original question, what will happen if you install a RAM or ROM cartridge? I've not stared at the schematics enough with your question in mind yet, as I have my own hardware woes at the moment, but it's something worth looking at. I used the penultimate cartridge , with different memory...

USA_Joe wrote: ↑Tue Jul 02, 2024 8:26 pm Wow! That's sounds fun, exciting, and challenging.

Best of luck!

Joe

Yes, it's quite a challenge, but quite exciting !

JonBrawn wrote: ↑Tue Jul 02, 2024 6:31 pm Are you planning on using modern 6502 devices, or vintage processors?

Both will be supported if everything goes to plan

Working on a project of a new VIC20 motherboard.. I'm still far from completion. I'm doing all separated section
that I will "glue" together.

Personally speaking, I would be hesitant to have that question "answered." - OGM I'm trying to find out the pertinence of this comment toward the original question... I didn't, out of the blue, come up with this idea. I replaced most of the glue logic chips with a CPLD and I was running o...

According to the schematic, UF8 purpose is to create a buffered databus to split CDB with BDB. Doing some testing, i removed UF8 and bridged CDB(0-7) to BDB(0-7) and everything seems to work correctly. I tested the penutimate and other apps and games, without any issues, so far. Now the question is,...

There is also this: https://www.tindie.com/products/c0pperdragon/vic20digitizer/ But you also need an RGBtoHDMI-device as well in combination with this. I haven't seen this in action myyself, but it seems to provide the best picture from a technical standpoint. i'm using this combo and the picture ...

yes, for sure, but you will have to solder a wire to the reset path. I have free pins on the header.

At the end this will work with my memory expansion board that will handle the reset.

The switching is done with a single POKE, then you have to reset the computer. The clocks are generated on the board, so the xtal on the motherboard can be remove to make the switcher sit lower. I have the signal generate to switch the kernal, I'm doing the little PCB to be used in the kernal socket...

@avsars Mike sum up the challenge with adding memory visible to the VIC chip, but, I made a prototype circuit that will fix this problem. It will also be solderless and plug and play, with additional VRAM banks. But I have to finish this ram expansion first. I also add a nice feature ( I think :D ) ...

I didn't yet. I want to complete the basic setup, then i'll make some tests.

Indeed that Ultimem never been used at its full power ; I will keep mine simple and no fancy goodies. Just an internal way to
have expanded memory and kernal variant without clogging the expansion port.

A little update. I modified the menus. In the ram section, you can add as needed the RAM123 and/or IO2-3 with any 8k-16-24 and 32k config. In the ROM menu, I added an option to have a second basic rom. So with the OEM Kernal, it left 3 slots for other Kernal.

The choices are colorize in green.

Thanks Mike for the inputs, I'm gonna go read the topic with Jim to see how it goes. I wanted to keep the banking sample to avoid too much possibility and void compatibility problem but, if the programmer can control the banking behind the curtain as he want, this may do the trick. Also, the bank sw...