Search found 4673 matches
- Mon Apr 08, 2024 2:25 am
- Forum: Programming
- Topic: Double buffering screen bitmap
- Replies: 22
- Views: 6883
Re: Double buffering screen bitmap
In "Back in the Good Old Days" demo from 2004 I allocated chars dynamically (like a ring buffer) when drawing and eor-filling the frame [...] Char 0 was used for empty screen [...] I had 3 more "preset" chars for quickly filling 4x16 pix areas of solid colors (bit patterns $55, ...
- Sun Apr 07, 2024 4:15 am
- Forum: Collecting and History
- Topic: 2024 eBay pricing, What the actual?
- Replies: 4
- Views: 389
Re: 2024 eBay pricing, What the actual?
There seems to be an odd contradiction, as more people find Dad's box of computer stuff in the loft and flog it there are more people wanting to reminisce about their first computer. Or the sellers simply count on uninformed buyers. For example, nearly all cartridges had their ROMs being dumped so ...
- Sat Apr 06, 2024 6:57 am
- Forum: General Topics
- Topic: ** Revision 2024 Invitation / Website
- Replies: 18
- Views: 2299
Re: ** Revision 2024 Invitation / Website
I struggled with those double irqs If the purpose of those "double IRQs" is to set up a stable raster IRQ, you might want to take a sharp look at this: ** Stable rasters on the VIC-20 . That is the canonical way to do this on the VIC-20, with a cycle exact timer interrupt once per frame, ...
- Thu Apr 04, 2024 8:07 am
- Forum: General Topics
- Topic: ** Revision 2024 Invitation / Website
- Replies: 18
- Views: 2299
Re: ** Revision 2024 Invitation / Website
It would have been preferable to raise that kind of question in PM: Amused disbelief, I suppose; my apologies if that approach to fostering discussion instead generates discontent on anyone's part ... That is the issue with any one-word comment placed in public that leaves the one being addressed in...
- Thu Apr 04, 2024 1:04 am
- Forum: General Topics
- Topic: ** Revision 2024 Invitation / Website
- Replies: 18
- Views: 2299
Re: ** Revision 2024 Invitation / Website
CGA? Yes. Do you not know what CGA is or is that question mark intended to convey disbelief? I have seen that VIC20 on the table. What hardware was attached to it? The VIC-2020 MINIMON cartridge with Mega-Cart as secondary cartridge. Plus a Manosoft C64SD V2 SD2IEC drive. And on the monitor I have ...
- Wed Apr 03, 2024 12:53 pm
- Forum: Programming
- Topic: 320x200 - a CGA emulator for VIC-20! (+35K RAM req'd)
- Replies: 13
- Views: 9248
- Wed Apr 03, 2024 12:32 pm
- Forum: Hardware and Tech
- Topic: Late (not actually) to the FE3 party. Operational Queries.
- Replies: 19
- Views: 826
Re: Late (not actually) to the FE3 party. Operational Queries.
There's also a RENUMBER command in the Programmer's Aid cartridge, the dump of which could easily be installed with the cartridge menu of FE3 ...
- Wed Apr 03, 2024 12:08 pm
- Forum: General Topics
- Topic: ** Revision 2024 Invitation / Website
- Replies: 18
- Views: 2299
Re: ** Revision 2024 Invitation / Website
So we can meet there :) For the record, tokra had his VIC-20 set up and running on a table right next to the central corridor. ... BTW, tokra and I had a nice meetup with two graphicians from Poland (skrzyp and Erick Elis of INBA Systems) who were amazed seeing skrzyp's entry to the Oldskool Graphi...
- Sun Mar 31, 2024 8:18 am
- Forum: Games
- Topic: Chariot Race unexpanded from tape. Why does it require 8K expansion from disk?
- Replies: 1
- Views: 179
Re: Chariot Race unexpanded from tape. Why does it require 8K expansion from disk?
Did converting this game to load from disk force the use of a RAM expander? Those are just bad "cracks" - not that the game actually had a copy protection of any noteworthiness. However, bringing all the data into place from disk instead of tape might require some extra memory, because ta...
- Fri Mar 29, 2024 1:17 pm
- Forum: General Topics
- Topic: ** Revision 2024 Invitation / Website
- Replies: 18
- Views: 2299
Re: ** Revision 2024 Invitation / Website
Thank you!
Greetings,
Michael
Edit: The video is up here: https://www.youtube.com/watch?v=LiPrL9788wU. Enjoy!wrote:You should seriously consider giving it again, or even doing a YouTube version for us!
Greetings,
Michael
- Wed Mar 27, 2024 2:38 am
- Forum: General Topics
- Topic: ** Revision 2024 Invitation / Website
- Replies: 18
- Views: 2299
Re: ** Revision 2024 Invitation / Website
To those interested,
I will give a seminar lecture on the topic of Machine Language Monitors on Revision 2024.
The seminar is scheduled on Friday, Mar. 29th, 6 P.M. CET (1 P.M. EST, 10 A.M. PST).
Greetings,
Michael
I will give a seminar lecture on the topic of Machine Language Monitors on Revision 2024.
The seminar is scheduled on Friday, Mar. 29th, 6 P.M. CET (1 P.M. EST, 10 A.M. PST).
Greetings,
Michael
- Wed Mar 27, 2024 2:19 am
- Forum: Emulation and Cross Development
- Topic: Assembler
- Replies: 38
- Views: 3363
Re: Assembler
In this thread here, another recent thread about " Recommendations for VIC-20 assembly tutorial[s], tools " already had been mentioned. In that other thread you will find the link to my VICMON primer . That one specifically aims to make the bridge between a high level language (here, BASIC...
- Mon Mar 25, 2024 2:00 pm
- Forum: Programming
- Topic: Line drawing algorithm
- Replies: 20
- Views: 2268
Re: Line drawing algorithm
Do the tables get generated each time the routine is called or only once on initialisation? I suppose you mean the tables that are written in lines 20..27 of the test rig: these of course need only be written once, at program start. The main loop of the test rig just sets random co-ordinates for th...
- Sun Mar 24, 2024 4:06 pm
- Forum: Programming
- Topic: Unixoid VIC
- Replies: 23
- Views: 2513
Re: Unixoid VIC
See the thread "Printing (unsigned) 16-bit numbers in Assembly, how?".pixel wrote:Now for chasing zombies… how did printing decimals work again?
- Sun Mar 24, 2024 1:37 pm
- Forum: Programming
- Topic: Line drawing algorithm
- Replies: 20
- Views: 2268
Re: Line drawing algorithm
I'm curious: what if you had y2>y1, so lines were always drawn in one direction vertically as well? You can't have both. Given x2>x1 and y2>y1, a line on screen looks like a backslash, "\", assuming a left-handed co-ordinate system. You can't enforce y2>y1 though when the endpoints alread...