Search found 492 matches

by groepaz
Wed Aug 16, 2017 10:10 am
Forum: Games
Topic: Sprites and Color Clash
Replies: 6
Views: 152

Re: Sprites and Color Clash

i always come back to "bandits" as a quite impressing "sprites" game on vic20... it has some clashes though :)
by groepaz
Sat Aug 12, 2017 10:13 am
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

Last year, Sylvain, Fredric and i did develop a replacement for the 6526/8520/8521 CIA used in the C64, C128, C128D, 1571, 1581 and Amiga line of computers.

sounds like something jimmy would write 8)
by groepaz
Sun Jul 30, 2017 12:44 pm
Forum: Programming
Topic: Stable Raster Interrupts
Replies: 30
Views: 2869

Re: Stable Raster Interrupts

you can only shift it by 1 cycle minimum
by groepaz
Sat Jul 29, 2017 9:25 am
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

Then you replied to what I said to him by mentioning 8 MHz is also extremely slow by today's standards. Ergo, you disagree with me and you're saying it is feasible to run a software emulation of the VIC-II in the same manner. Are you? i said that it is slow by todays standards. no more no less. all...
by groepaz
Sat Jul 29, 2017 4:26 am
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

yeah sure, you are right. as always :roll: (it wasnt me who started with the "offtopic". nor did cbmeeks specifically nail it on software emulation.)
by groepaz
Fri Jul 28, 2017 5:49 pm
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

do you realise that you are the only one trying to nail this on software emulation? :)
by groepaz
Fri Jul 28, 2017 5:08 pm
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

The VIC-I has a dot clock of about 4MHz, the VIC-II has a dot clock around 8 MHz. The SID can be emulated by software on a uC board because by today's standards 1 MHz is extremely slow. 8MHz are no less slow by todays standards really. The reason for why SID is relatively easy to do compared to a V...
by groepaz
Fri Jul 28, 2017 8:53 am
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

one major problem is that in a C64 (unlike in many other systems) the VIC plays an integral role in the system, when it doesnt work (at least halfway) right, then *nothing* works. you must get all the external timing perfectly right before you can even try it out in a C64 - in practise that means fi...
by groepaz
Fri Jul 28, 2017 8:01 am
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

The VIC-I and VIC-II are a really special case because they incorporate both digital and analog electronics technology. there is very little analog stuff in either. if you make the replacement generate for example HDMI instead of analog video, then you can eliminate all of that. (and even if you do...
by groepaz
Wed Jul 26, 2017 6:26 am
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

drop-in replacement havent been done because a) they are even harder to do than a complete FPGA core (you must meet external timing at all times) and b) they would be quite expensive (likely more expensive than real chips)
by groepaz
Sun Jul 23, 2017 6:27 am
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 34
Views: 481

Re: GandALF, substitute for the MOS 325572-01

This was not done with the idea that I would sell a lot of them but rather with documenting this chip and understanding what goes on at the lower level of the 1541.

so where is said documentation? :)
by groepaz
Wed Jul 19, 2017 3:04 pm
Forum: Hardware and Tech
Topic: Anyway to test cassette read signals?
Replies: 3
Views: 77

Re: Anyway to test cassette read signals?

write some test programs and submit them to the VICE repo! :)

perhaps you can take enthusis "minimal head align" (check csdb) and port it over to the VIC20... at least you should be able to see if something is terribly broken with this
by groepaz
Mon Jul 17, 2017 6:19 am
Forum: Other Systems
Topic: The Ultimate-64
Replies: 9
Views: 180

Re: The Ultimate-64

A built in megacart clone would be cool too

ours has that already :D
by groepaz
Sun Jul 16, 2017 6:51 am
Forum: Other Systems
Topic: The Ultimate-64
Replies: 9
Views: 180

Re: The Ultimate-64

the core on the mist is totally different - we have our own. it will then mostly likely get all the features that the chameleon core does have right now (turbo, 1541 emulation, cartridges etc) Sounds great with a VIC20 core but the physical board would need to be different as well to fit in a VIC20 ...
by groepaz
Sat Jul 15, 2017 9:02 am
Forum: Other Systems
Topic: The Ultimate-64
Replies: 9
Views: 180

Re: The Ultimate-64

The C64Reloaded MK3 will also come soonish.... and we DO have a VIC20 core :)

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