Denial

Just to check, we've had 112 new users join Lemon64 in the last month. Of course, some could be bots, some could be lurkers, some may never post. But gives you an idea there. At Lemon64 new members are deleted after one month if they have not activated their account and after two months if they hav...

You can also use PS/2 mouse with an adapter. Here is my driver for C64 + user port, but it can easily be changed to use any I/O pins. It supports mouse wheel and up to five buttons.

orion70 wrote:I once spotted a book about the game company, but can't remember where. It was some sort of visual compendium of those games.

Nufekop: Images of a classic game company. $3.71 for eBook isn't that bad. I bought it a while ago and don't think I wasted my money.

Vic 2000 wrote:While speaking of Nufecop

Ah, Nufekop...

Wiki page 40 and 80 column boards updated. I also uploaded the charset EPROM contents to http://sid.fi/~tnt/vic20/zero18/

Have you seen this?
http://web.archive.org/web/200706141143 ... argon.html

This post will give you a starting point if you decide to start disassembling Sargon II.
http://sleepingelephant.com/ipw-web/bul ... 329#p80329

I have C64 Sargon II disassembly somewhere. If I have a free evening or two next week I will assemble it to $a000 area to check if VIC 20 code is the same. Too many code changes to make it fit VIC-20 memory for easy comparison, so I did partial disassemply of VIC-20 version. As far as I can see, C6...

Is there any point in a Sargon II v Sargon II but VIC 20 Vs C64? Would the only difference be processing power (actually from what I recall that's advantage VIC 20!) I have C64 Sargon II disassembly somewhere. If I have a free evening or two next week I will assemble it to $a000 area to check if VI...

My favourite feature seems to be gone (or at least I cannot find it), namely, the "new posts", "your posts","unread posts", which I am missing. They are hidden in the "Quick links" dropdown in top left corner. Took me a while to find them myself. Rather inter...

You asked at Lemon64

Different board layout, pretty much identical support chips which isn't surprising given MC6845's design. Zero 18 uses more glue logic.


If someone wants to add any of the information to Denial wiki then feel free to do so.

I bought the aforementioned 40/80 column card a while ago and finally had time to test it out. Unfortunately I don't have the manual so what better way to reveal it's secrets than to disassemble the ROM. You can find the EPROM dump, disassembly and text file describing startup keys, SYS commands and...

Oh yeah, busy loop's stupid tendency to force LED state based on whether there's job in queue or not... However, you can use that feature to blink the LED yourself ;) 10 open15,8,15:print#15,"m-w"chr$(0)chr$(3)chr$(1)chr$(96) 20 print#15,"m-w"chr$(0)chr$(0)chr$(1)chr$(208) 30 pri...

Do M-W to $1c00 to control the LED, bit 3 IIRC. No, it won't work without proper 6502/6522 emulation unless there is specific code for it in the firmware.

ETA: Better to read the old value first to not change other bits

What about this?

Another quick one in the inner loop, saving 2 cycles per pixel if I can count. Replace sta tmp scrbuf: lda buffer,x ; self modified screen addr smask: and #0 ora tmp scrbuf2: sta buffer,x ; self modified screen addr with eor buffer,x ; eor all pixels and #0 ; clear all but the new (eored) pixel eor ...