Search found 531 matches

by groepaz
Fri Jul 28, 2017 5:08 pm
Forum: General Topics
Topic: GandALF, substitute for the MOS 325572-01
Replies: 49
Views: 1040

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: 49
Views: 1040

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: 49
Views: 1040

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: 49
Views: 1040

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: 49
Views: 1040

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: 151

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: 255

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: 255

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: 255

Re: The Ultimate-64

The C64Reloaded MK3 will also come soonish.... and we DO have a VIC20 core :)
by groepaz
Thu Jul 06, 2017 8:09 am
Forum: Programming
Topic: Vic-20 mouse driver & demo program for NEOS mouse
Replies: 48
Views: 4004

Re: Vic-20 mouse driver & demo program for NEOS mouse

i have a NEOS mouse here now....and i can tell two things for sure: - mouse cheese does neither use, nor even check, the left mouse button - the left mouse button IS connected to fire, just like vice used to emulate it (and i am right now putting that back into VICE) really curious now how you came ...
by groepaz
Wed Jun 28, 2017 3:39 pm
Forum: Hardware and Tech
Topic: VIA CA2 interrupt
Replies: 5
Views: 185

Re: VIA CA2 interrupt

if you find out that it actually matters.... please say so :) (and perhaps report a bug on the vice tracker)
by groepaz
Wed Jun 28, 2017 1:17 pm
Forum: Hardware and Tech
Topic: VIA CA2 interrupt
Replies: 5
Views: 185

Re: VIA CA2 interrupt

Another option is to rework the tests slightly so that CA2 isn't configured as an input, therefore removing any influence on the test results.. uhm, no. the tests deliberately use all kind of configurations - including those that "make no sense". because emulation should behave the same e...
by groepaz
Wed Jun 28, 2017 10:22 am
Forum: Hardware and Tech
Topic: VIA CA2 interrupt
Replies: 5
Views: 185

Re: VIA CA2 interrupt

i wrote those tests and verified they are correct on my vic20 (PAL) - keep in mind though that a lot of them still do not work correctly in VICE :)

cant really explain the behaviour of the VIA either, wish i could =P
by groepaz
Wed Jun 28, 2017 8:55 am
Forum: Emulation and Cross Development
Topic: Disk image editor for Linux?
Replies: 5
Views: 230

Re: Disk image editor for Linux?

i'm just use commandline utils like c1541 for that - at least they arent a buggy mess like that dirmaster thing =P

edit: there is diskimagery from lallafa - but i wouldnt recommend it, its also very buggy.
by groepaz
Fri Jun 23, 2017 9:32 am
Forum: General Topics
Topic: Additional Sound Chip Suggestions...
Replies: 16
Views: 424

Re: Additional Sound Chip Suggestions...

what about OPL3?

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