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by Mike
Fri Feb 02, 2018 8:24 am
Forum: Emulation and Cross Development
Topic: VICE - Write to Cart Image Possible?
Replies: 12
Views: 261

Re: VICE - Write to Cart Image Possible?

My hardware does do something that may not be achievable in VICE though. From the viewpoint of VICE, like it is with the VIC-20 itself, your hardware appears just like any other cartridge. It just needs a fixed design, a thorough documentation, and an heightened interest of one of the VICE maintain...
by Mike
Fri Feb 02, 2018 3:08 am
Forum: Emulation and Cross Development
Topic: VICE - Write to Cart Image Possible?
Replies: 12
Views: 261

Re: VICE - Write to Cart Image Possible?

I don't want to change anything in my code to use VICE I suppose it will take some time until *you* will get to write programs that genuinely show different behaviour on VICE compared to real hardware. Over the years, VICE has got very accurate in its emulation. In most cases, where people complain...
by Mike
Thu Feb 01, 2018 4:05 pm
Forum: Emulation and Cross Development
Topic: VICE - Write to Cart Image Possible?
Replies: 12
Views: 261

Re: VICE - Write to Cart Image Possible?

Radical Brad wrote:It tried to do a LOAD and RUN, but nothing happened.

Press Alt-R to do a soft reset (i.e. without clearing RAM).
by Mike
Thu Feb 01, 2018 3:46 pm
Forum: Emulation and Cross Development
Topic: VICE - Write to Cart Image Possible?
Replies: 12
Views: 261

Re: VICE - Write to Cart Image Possible?

Try:

Code: Select all

.org  $9FFE
.word $A000

Greetings,

Michael

P.S. the repeated .org directives in your sample code above are completely redundant
by Mike
Tue Jan 30, 2018 4:13 am
Forum: Games
Topic: Vic-20 version of Stix?
Replies: 3
Views: 141

Re: Vic-20 version of Stix?

See here: Squeeze. It misses the line animation though. :(

BTW, the arcade original goes by the name QIX.
by Mike
Sun Jan 28, 2018 12:05 pm
Forum: General Topics
Topic: Warning : Your VIC is now clasified as a Lethal Weapon!
Replies: 16
Views: 488

Re: Warning : Your VIC is now clasified as a Lethal Weapon!

Your enhanced video modes are letting Big Brother spy on you by reading the Van Eck Radiation from your CRT! Better keep that model 1600 unplugged from the land line while you work! Unlikely. I'm working in a completely shielded environment with no chance for EM waves to leak out. Even cell phones ...
by Mike
Sun Jan 28, 2018 11:47 am
Forum: General Topics
Topic: Warning : Your VIC is now clasified as a Lethal Weapon!
Replies: 16
Views: 488

Re: Warning : Your VIC is now clasified as a Lethal Weapon!

Dang! Someone must have told them of my newest project ... :shock:
by Mike
Fri Jan 26, 2018 6:48 am
Forum: Hardware and Tech
Topic: Introducing VFLI for VIC-20: 208x256 pixels in 16 colours!
Replies: 105
Views: 36412

Re: Introducing VFLI for VIC-20: 208x256 pixels in 16 colours!

Kakemoms wrote:Wow! Thats a really great picture.. maybe I need to modify one of my 5 Vic's.. :roll:

Sure, go ahead! Everything you need to know to reproduce this mod has been summarized by me in the first page of this thread.
by Mike
Sun Jan 21, 2018 11:04 am
Forum: Hardware and Tech
Topic: VCU-piggyback
Replies: 2
Views: 94

Re: VCU-piggyback

From the description in those two magazines, the VCU piggyback is a small PCB (printed circuit board) that was (or could be) fitted to very early VIC-20s (and Japanese VIC-1001s) to improve their colour output: http://sleepingelephant.com/denial/wiki/images/3/3a/VIC-1001_video_pots.jpg (from http://...
by Mike
Fri Jan 19, 2018 3:00 pm
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 12
Views: 424

Re: Paddlescope

- The jitter of POTY can be minimized by not reading it out at arbitrary times. Rather, the readout should be done in a screen range, where the video signal itself is not overly modulated. Best candidate seems to be during the VBLANK time. I thought about this a bit and set the "duty cycle&quo...
by Mike
Fri Jan 19, 2018 10:40 am
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 12
Views: 424

Re: Paddlescope

tokra wrote:Do you have an old 2-prong-VIC-20 or a newer CR-model with the DIN-plug for power?

It's the CR variant.
by Mike
Fri Jan 19, 2018 9:28 am
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 12
Views: 424

Re: Paddlescope

Today I took the opportunity to run Paddlescope on my own VIC-20. Actually, the jitter is effectively non-existent there with POTX, I just saw some noise with an amplitude of +/- 3 units. Unfortunately, the chip does show the coupling of the video signal with POTY (even if it's not that pronounced a...
by Mike
Thu Jan 18, 2018 12:50 pm
Forum: Hardware and Tech
Topic: VIC - why 22 Columns?
Replies: 14
Views: 312

Re: VIC - why 22 Columns?

I'm wondering about that particular number "22". It could have been 20 or 24 as well, so why 22? With 22 columns, you get the maximum number of characters with an even number of columns , if you intend to keep the screen RAM size at 512 bytes or below: - 20 columns => 25 rows, 500 bytes, ...
by Mike
Fri Jan 12, 2018 1:33 am
Forum: Programming
Topic: Pet crude web browser
Replies: 2
Views: 152

Re: Pet crude web browser

Look here: HTML Walker.

You just need to add a component (hardware and software) that fetches URLs.

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