Search found 4648 matches

by Mike
Tue May 14, 2013 10:01 am
Forum: Hardware and Tech
Topic: vic-1110 8k ram cart upgrade (and other solutions)
Replies: 59
Views: 10767

pallas wrote:I was thinking the same: is my ram expansion slower? Here is the screenshot: [...]
... which confirms my later edit. Your DRAM expander does not introduce wait states for the CPU. :)
by Mike
Tue May 14, 2013 9:55 am
Forum: Programming
Topic: CBM BASIC 2.0 using STR$
Replies: 12
Views: 1884

You can use MID$(STR$(...),2) to strip off the first character of the numeric string. The blank character serves as placeholder for the minus sign, so negative numbers wouldn't disturb the layout. And the conversion of numbers in the range 0 .. 255 into a two-digit hex string can be expressed somewh...
by Mike
Mon May 13, 2013 10:44 am
Forum: Hardware and Tech
Topic: vic-1110 8k ram cart upgrade (and other solutions)
Replies: 59
Views: 10767

- it has dynamic ram instead of static It would be interesting to know if the DRAM refresh introduces wait cycles. The program MG Raster employs a cycle exact interrupt to change the VIC registers several times on each line, and during the visible part of the screen it relies upon that there are 71...
by Mike
Mon May 13, 2013 10:33 am
Forum: Games
Topic: Looking for some recommendations..
Replies: 6
Views: 1292

I'd like to add these two:

* Frogger '07 - plays like the arcade, and

* Omega Fury - great successor of Omega Race.
by Mike
Sun May 12, 2013 3:05 pm
Forum: Programming
Topic: MINIGRAFIK batch processing suite
Replies: 55
Views: 49850

Another one for a rainy Sunday - the rendition of a broken Penrose tribar with MINIGRAFIK: ( download ) https://dateipfa.de/.Public/denial/images/minigrafik/tribar.png Here's the listing. The assignment 'A=5/3' in line 11 refers to PAL, NTSC users should replace it with 'A=3/2' to compensate for the...
by Mike
Mon May 06, 2013 2:39 pm
Forum: Hardware and Tech
Topic: How do I Remove the VIC 6560 chip
Replies: 9
Views: 1596

HermanVIC wrote:AC on the supply is around .4 volts on all three.
Now that's definitely outside spec.

You should replace both C39 (4700 µF/16 V) and C44 (100 µF/16 V). As with all electrolytic capacitors, take care of their polarization. Then redo both DC and AC checks on the 5 V supply voltage.
by Mike
Mon May 06, 2013 10:34 am
Forum: Hardware and Tech
Topic: How do I Remove the VIC 6560 chip
Replies: 9
Views: 1596

One is working through composite video. O.K. I read about that one in another thread. At first, let's assume the modulator is at fault here, and concentrate on the two defective VIC-20s. All use two prong power supply. I have multimeter [...] I suppose the fuse is in order. With voltage measurement...
by Mike
Sun May 05, 2013 12:54 pm
Forum: Hardware and Tech
Topic: How do I Remove the VIC 6560 chip
Replies: 9
Views: 1596

You could (have) use(d) IC extraction tools that can grip longer chips from both sides, and wiggle until the chip pops out. As a rule of thumb, you should test a suspected defective chip in a functioning unit (i.e., VIC-20) - never the other way round. If there's something that killed your VIC in yo...
by Mike
Thu May 02, 2013 10:14 am
Forum: Hardware and Tech
Topic: My hardware project :: GCart 2011
Replies: 154
Views: 89755

However, I haven't given up on this, and now and then I spend time on it. Well then, I also have my share on unfinished projects on the VIC-20. ;) Of course there's no fixed deadline for hobbyist projects (unless there's something like a demo-party and you want to attend a compo with the result of ...
by Mike
Wed May 01, 2013 11:20 pm
Forum: Hardware and Tech
Topic: My hardware project :: GCart 2011
Replies: 154
Views: 89755

So, one year after my last post in this thread, how's the progress? I was somehow disappointed that, IMO, the project went into a mix of hibernation and creepy featurism instead of producing a working prototype that could also be tested by other people. :? For me, the most interesting aspects were t...
by Mike
Wed May 01, 2013 3:59 pm
Forum: Announcement Board
Topic: VIC-20 Software Releases of 2013
Replies: 40
Views: 50351

Name: Munching Squares Author: Mike Released: May 1, 2013 Requirements: VIC-20 with +8K RAM expansion, disk or tape Description: Display hack Screenshot: https://dateipfa.de/.Public/denial/images/minigrafik/munching_squares.png Download: munching_squares.zip Read more and discuss Munching Squares he...
by Mike
Wed May 01, 2013 3:53 pm
Forum: Programming
Topic: MINIGRAFIK batch processing suite
Replies: 55
Views: 49850

Today I ported a display hack over to the VIC-20, which I had originally programmed on the C128 some 25 years ago. Its name, 'Munching Squares', is an hommage to a similar program which saw the light of day on the PDP-10 as early as 1962! Here's the BASIC source. The *.d64 file ( download ) features...
by Mike
Mon Apr 29, 2013 11:45 am
Forum: Programming
Topic: MINIGRAFIK batch processing suite
Replies: 55
Views: 49850

I wonder if given an unlimited size drive of some sort what sort of video you could get out of the vic20. Obviously it would be RAW, but what is the best resolution you could come up with? Or even with 24k of ram, maybe a looping animation. Feel free to try it out. I don't own a monopoly on graphic...
by Mike
Sun Apr 28, 2013 2:32 pm
Forum: Programming
Topic: MINIGRAFIK batch processing suite
Replies: 55
Views: 49850

C64? What C64?

;)
by Mike
Sun Apr 28, 2013 12:48 pm
Forum: Announcement Board
Topic: VIC-20 Software Releases of 2013
Replies: 40
Views: 50351

Name: View3K Author: Mike Released: April 28, 2013 Requirements: unexpanded VIC-20, disk or tape Description: Viewer for MG pictures. Runs on both PAL and NTSC. Screenshot: https://dateipfa.de/.Public/denial/images/minigrafik/duck.png Download: view3k.zip Read more and discuss View3K here .