Search found 125 matches
- Mon Jan 16, 2023 10:32 pm
- Forum: General Topics
- Topic: Jeff's VIC 20 Book
- Replies: 279
- Views: 151508
Re: Jeff's VIC 20 Book
Can this PDF format support bookmarks? PDF exports often have as an option off any header style formatting. For example, its cover does not offer me to click on any TOC entry to jump to that page. I still have not created bookmarks for the PDF because pages are likely moving around, but I will for ...
- Sun Jan 01, 2023 9:51 pm
- Forum: General Topics
- Topic: Problems registering/activating accounts??
- Replies: 6
- Views: 3057
- Fri Dec 23, 2022 9:34 pm
- Forum: Programming
- Topic: Addressing into screen memory, how?
- Replies: 18
- Views: 4824
Re: Addressing into screen memory, how?
Is this an AGC emulator? 

- Fri Dec 23, 2022 4:21 pm
- Forum: General Topics
- Topic: Jeff's VIC 20 Book
- Replies: 279
- Views: 151508
Re: Jeff's VIC 20 Book
Minor quibble, but Page 94 calls the "illegal" opcodes pseudo-opcodes, when pseudo-opcodes are used for directives to the assembler, not actual opcodes. I would head it under its classic name, and also by the name the current best reference calls them: Unintended "Illegal" Opcode...
- Sat Nov 27, 2021 7:26 pm
- Forum: Programming
- Topic: Colour Memory why does it move?
- Replies: 4
- Views: 1322
Re: Colour Memory why does it move?
Hi, freshlamb, I answered this question in another context: http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=5572&hilit=changes+base+address&start=21 . In short: the colour RAM is actually 1K nibbles in size. It is not really moved but its use is changed as it is addressed wi...
- Tue Sep 14, 2021 2:52 pm
- Forum: Programming
- Topic: MULTIPLE KEY INPUT
- Replies: 12
- Views: 4213
Re: MULTIPLE KEY INPUT
See here for more details:
https://codebase64.org/doku.php?id=base ... kernal_way
Discusses 64, but the same principles apply for the VIC.
https://codebase64.org/doku.php?id=base ... kernal_way
Discusses 64, but the same principles apply for the VIC.
- Sun Sep 05, 2021 7:16 pm
- Forum: General Topics
- Topic: Famicom-music on VIC-20
- Replies: 39
- Views: 14633
Re: Famicom-music on VIC-20
That is epic! Any chance of getting some of the music from Solstice? A vic would probably explode attempting that... :P https://www.youtube.com/watch?v=k1A85jN5ca0 Man, I don't know what I was expecting (having not played it), but that title theme absolutely SLAPS. I had to tweak the script a bit t...
- Fri Sep 03, 2021 1:15 pm
- Forum: Programming
- Topic: out of memory
- Replies: 9
- Views: 2268
Re: out of memory
Hard to say without more detail (what line does the error occur on) Out of memory error could also be you running out of stack space. Gosubs eat stack and complex expressions (lots of parenthesis. although maybe that's a ?formula too complex error, i don't remember) so maybe something like that is h...
- Wed Jul 28, 2021 10:03 pm
- Forum: Programming
- Topic: Testing for zero after DEC
- Replies: 9
- Views: 1800
Re: Testing for zero after DEC
Yes, it's unnecessary.
- Mon Jul 19, 2021 8:01 pm
- Forum: Programming
- Topic: a Maze generator program
- Replies: 25
- Views: 11802
Re: a Maze generator program
Yes, I used the Compute algo for Katabatia (c64) and dropping rooms in later greatly increases how good of a maze it is. It still suffers from a few long passages and zig-zag paths, but it is much better. You can also pre-seed the map with different patterns and the algo will chug away and do it's b...
- Sat Jun 26, 2021 3:40 pm
- Forum: Games
- Topic: Archon - Unexpanded VIC 20 Version
- Replies: 19
- Views: 7157
Re: Archon - Unexpanded VIC 20 Version
I agree with Jeff:
(It helps that I am also a Jeff, it would be weird to disagree with myself) Insane and impressive.

- Fri Apr 30, 2021 11:02 pm
- Forum: Games
- Topic: Three new games for the unexpanded VIC
- Replies: 14
- Views: 17538
Re: Three new games for the unexpanded VIC
Looks like a nice LCD game! Though the arms up graphics of "Kong" looks more like he's sitting in front of a vase than it being his body.
- Wed Mar 17, 2021 2:26 pm
- Forum: Other Systems
- Topic: Atari XE: Is it a console or a computer?
- Replies: 11
- Views: 6660
Re: Atari XE: Is it a console or a computer?
So the VTech Creativision is a computer to you? "The CreatiVision console sported an 8-bit Rockwell 6502 CPU at a speed of 2 MHz, 1KB of RAM and 16KB of Video RAM, and had a graphics resolution of 256 × 192 with 16 colors and 32 sprites. The console had two integrated joystick/membrane keypad ...
- Sun Feb 14, 2021 7:43 pm
- Forum: Programming
- Topic: Flipping a Byte
- Replies: 8
- Views: 1620
Re: Flipping a Byte
Not exactly the same thing, but has some similar requirements but flipping an 8x8 bit matrix along the diagonal is discussed here: http://forum.6502.org/viewtopic.php?f=2&t=6412
- Thu Jan 21, 2021 10:02 pm
- Forum: Games
- Topic: Trolley Problem for Unexpanded VIC
- Replies: 17
- Views: 5873
Re: Trolley Problem for Unexpanded VIC (WIP)
I agree with the comment on the video, it looks disconcerting to see the trolly make an impossible turn. If you can't actually fit a switching animation in, maybe it would be better to alter the static look of the intersections.