Denial

...for now. More functional modifications are in the design phase.

Correct, eslapion, 2 alone works, shifted gives quote, and CTRL-9 and -0 turn RVS on & off.

eslapion wrote: If all the above is true then there may be a problem with the BASIC ROM.

Luck is not with me for this possibility, either: Only the Kernal ROM is socketed.

Just my luck it would be the VIA that isn't socketed. Reverse E doesn't appear. That key combination has no effect at all. When you do something like PRINT "{ctrl}+2" does it show a reverse E, but just not change the color to white? Or does the reverse E fail to appear? You're getting whit...

groepaz wrote: ↑Fri Jul 17, 2020 11:44 am Are you sure the CTRL key works at all?

Every color key works with CTRL except White (2).

Keyboard CTRL2 or PRINT "[CTRL2]" doesn't change character color: it stays what it was previously.

I can get white chrs by POKEing color RAM or location 646, but by keyboard or by PRINT doesn't produce White chars.

Has anyone seen this or know of a fix?

... if you're hooking up to a flatscreen (composite is terrible in that arena) but I wouldn't hold my breath. I don't understand why that should be. My VCR (Yeah, I still have and use one,) output is composite and it has always looked fine on flat screen TVs. I've only recently connected VIC to a f...

I cited the C64 mechanism only as an example of a register that can't get banked out, regardless of where it might be located or the configuration it sets up.

(Obviously, my edit for "clarity" was lacking.)

My personal goal is to allow all the memory to be RAM, like on the C64... Jim To bank ALL memory of a 64K range the banking has to be done from a location that does not and cannot get banked. The C64 accomplishes this with a 6-bit I/O port at locations 0000h and 0001h on the 6510 mpu. To add decodi...

Where do you tap the signals to effectively disable them? The /RAMCASs are at R29 and R30. I'm not certain about the /RAS resistor: It looks like R7 in the flat schematic and R1 in the 'D. All three Rs are 68ohm. R29 and R30 are near the DRAMs and I expect the /RAS resistor is nearby. I'll have to ...

Very Cool! This motivates me to try something I've thought about for a while: to do something similar on the C128. I wouldn't de-solder the sixteen 64Kx1s in the flat model or even the four 64Kx4s in the 'D, though, but instead disable them by making their /RAS and /CAS high.

Thank you. That was very informative. Doesn't solve the mystery of which socket my long-lost-friend's 65C22 worked in and which it didn't, but since the chip I have isn't WD I don't think I'll try it in either VIA socket.

Thanks again

Years ago an internet friend told me he substituted a 65C22 for one of the VIC's VIAs and said it worked in one socket but not in the other. I don't remember which socket he said was the one that caused problems, and after all this time doubt if he would remember either, even if I knew how to contac...

Thanks for the mention. I got a little carried away decoding that area. It could've been done much simpler, but I was planning ahead, in case I might think of other items to put in that area. (I have, but that discussion would be more suited to the Hardware subforum.) Anyway, it seemed a waste to ha...

To very briefly thread-jack... I have an MD65SC22 (Mitel) salvaged from something years ago. Can I safely use it in a VIC-20, or is it likely to have the IRQ problem mentioned? Also years ago, someone told me tried a CMOS '22 in his VIC and it worked in one VIA socket but not in the other, but I've ...

Cool! I blame my eyesight for missing that. (That and me looking for it among the BLK registers.)