Search found 7 matches

by jbevren
Sat Nov 12, 2016 1:32 pm
Forum: Buy, Sell, and Trade
Topic: VIC 1112 IEEE Interface
Replies: 111
Views: 23598

Re: VIC 1112 IEEE Interface

I'd like to chime in here. First, lets get some flame bait out of the way. These 1112's are not simple to solder. I know, as I soldered a prototype myself before the kickstarter was shipped. Let's also not forget that this is not something Dragos does as a primary gainful employment gig. As this is ...
by jbevren
Wed Oct 12, 2016 5:10 am
Forum: Buy, Sell, and Trade
Topic: VIC-1905 Pac Man - For Sale **Extremely Rare**
Replies: 22
Views: 4600

Re: VIC-1905 Pac Man - For Sale **Extremely Rare**

That's unfortunately difficult to do with autostart ROMs. Do you have a cart expander bus or some way to disable the /blk5 signal while the VIC is powering up?

If so I can help you get the cart dumped! :)
by jbevren
Thu Sep 29, 2016 8:01 am
Forum: Collecting and History
Topic: Found Undumped Vicmon version
Replies: 2
Views: 1297

Re: Found Undumped Vicmon version

I did some initial looks at the monitor Dragos dumped and thought I'd post a few notes: vicmon3.1 @a000, 4096 bytes; no autostart rom md5sum (without load address) f78eb0afe250f3316da1e83e8fee3873 a7e8 -> brk low a7e9 -> brk high = a017 a7bb = commands : Hex: 3a 3b 52 4d 47 58 4c 53 54 46 47 44 50 2...
by jbevren
Sat Apr 30, 2011 5:58 pm
Forum: Programming
Topic: Random adventures in vic20 charcell graphics
Replies: 9
Views: 2110

A nice feature in my plot subroutine is that carefully crafted coordinates can be used to set specific bits in the I/O hardware (or anywhere in memory for that matter). Top that! :D
by jbevren
Thu Apr 28, 2011 6:47 pm
Forum: Programming
Topic: Random adventures in vic20 charcell graphics
Replies: 9
Views: 2110

Nice Michael! :)

For others that arent familiar with minigrafik, dont stumble as I did: the wedge requires 8k or more of expansion. :)

I couldnt work out why it wouldnt run. However, I kinda wonder why the 1541 goes blinky when it crashes on an unexpanded vic ;)
by jbevren
Thu Apr 28, 2011 4:13 pm
Forum: Programming
Topic: Random adventures in vic20 charcell graphics
Replies: 9
Views: 2110

Yeah the preview isnt an exact match to the program in the d64. The number that counts down is how many characters are still unallocated.

If you guys have any questions about the way it works feel free to post here. I'll monitor the thread for at least a couple days :lol:
by jbevren
Thu Apr 28, 2011 3:26 pm
Forum: Programming
Topic: Random adventures in vic20 charcell graphics
Replies: 9
Views: 2110

Random adventures in vic20 charcell graphics

I thought I'd share a quick basic scratchup that plots a gingerbread fractal on unexpanded vic. The program uses dynamic character cell allocation, starting from 255 and going down (potentially to 0). For informational ability, the first 64 chars are copied from ram during init. 8) http://jbevren.ne...