Search found 4710 matches
- Sat Apr 20, 2024 5:31 am
- Forum: Programming
- Topic: Unexpanded VIC Font Editor
- Replies: 4
- Views: 1663
Re: Unexpanded VIC Font Editor
I made a thing started from scratch Sunday. [...] Nice! It's an interesting idea to move up the BASIC start to $1800, so the character set sits comfortably at $1000. You might consider adding a raster split in the middle of the screen, between UI and font display, so the UI can still use the standa...
- Fri Apr 19, 2024 10:50 am
- Forum: Hardware and Tech
- Topic: WIP: VIC-2020 MINIMON cartridge
- Replies: 55
- Views: 19729
Re: WIP: VIC-2020 MINIMON cartridge
To all concerned:
MINIMON has been released on sourceforge, under the CC-BY-SA 4.0 licence.
Greetings,
Michael
MINIMON has been released on sourceforge, under the CC-BY-SA 4.0 licence.
Greetings,
Michael
- Thu Apr 18, 2024 1:18 am
- Forum: Emulation and Cross Development
- Topic: ASM502 - a new 6502 assembler.. (WIP)
- Replies: 22
- Views: 4853
Re: ASM502 - a new 6502 assembler.. (WIP)
orac81 was more cautious in the response, but anyway: During assembly, keep a hold of the state of the machine and comment on instructions that do not affect that state. For example: if it can be known that the carry is set, then do not assemble a SEC, but comment in the listing that that instructio...
- Tue Apr 09, 2024 11:45 am
- Forum: Hardware and Tech
- Topic: Run/Stop Restore doesn't work
- Replies: 3
- Views: 1366
Re: Run/Stop Restore doesn't work
[...] The IER does not work like a classical read/write register. Actually, the MSB specifies an action (0 = reset bit(s), 1 = set bit(s)), the lower 7 bits specify which of the interrupt sources is affected. More details here: Stop a running timer - and further discussion about the half dozen meth...
- Tue Apr 09, 2024 4:04 am
- Forum: Hardware and Tech
- Topic: Run/Stop Restore doesn't work
- Replies: 3
- Views: 1366
Re: Run/Stop Restore doesn't work
The order is important here: to initiate the BASIC warmstart, the STOP key must be held down while the RESTORE key is tapped. The other way round the NMI routine in the KERNAL will return immediately and pressing the STOP afterwards then has no effect. Does the STOP key function on its own (i.e. can...
- Mon Apr 08, 2024 7:54 pm
- Forum: Collecting and History
- Topic: 2024 eBay pricing, What the actual?
- Replies: 4
- Views: 1596
Re: 2024 eBay pricing, What the actual?
Wouldn't this rely on an FPGA implementation of the VIC chip? That's a common misconception. As I wrote elsewhere : a complete emulation of a computer, be it a software-only as in VICE or as combination of hardware and software in a FPGA has substantially relaxed timing requirements, as ultimately ...
- Mon Apr 08, 2024 6:44 pm
- Forum: Games
- Topic: Pixel's Harvester and a corrupt wetware memory.
- Replies: 4
- Views: 1593
Re: Pixel's Harvester and a corrupt wetware memory.
[...] colour clash. It's what the Speccy is famous for, but it didn't do it first. The Vic-20 beat it to colour-clash by at least a year. [...] About any home computer at that time had to compromise on memory bandwidth for the video chip. Adding lower resolution attributes to the 'B/W' display data...
- Mon Apr 08, 2024 2:25 am
- Forum: Programming
- Topic: Double buffering screen bitmap
- Replies: 22
- Views: 9013
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: 1596
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: 4951
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: 4951
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: 4951
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: 16
- Views: 11588
- Wed Apr 03, 2024 12:32 pm
- Forum: Hardware and Tech
- Topic: Late (not actually) to the FE3 party. Operational Queries.
- Replies: 19
- Views: 2454
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: 4951
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...