From: Hatch (hatch_at_in.com.au)
Date: 2005-02-03 14:45:49
Yep, I must of mucked it up. ----- Original Message ----- From: "Christopher Phillips" <firstname.lastname@example.org> To: <email@example.com> Sent: Thursday, February 03, 2005 9:39 PM Subject: Fwd: C64 GRAPHICS CARD > > I think this was meant to go to the list rather than just me :) > > Begin forwarded message: > > > From: "Hatch" <firstname.lastname@example.org> > > Date: 3 February 2005 19:09:34 GMT+08:00 > > To: "Christopher Phillips" <email@example.com> > > Subject: Re: C64 GRAPHICS CARD > > > > Fixed up that problem with the static ram. I took a look at how > > Nicholas > > Coplin interfaced the static ram on his Auto-RAMDOS project (Haven't > > seen > > him post on here for a while, anyone know what he's doing?), anyway I > > hope > > he doesn't mind me getting ideas from his design. I was using either > > phi 1 > > or /phi 2 for /WE and Nicholas used /RW (I know this was the most > > obvious > > way to do it but I actually didn't think the holding /WE low for the > > entire > > write cycle would be valid). Nicholas used /phi2 for /CS1 and I was > > using > > RW. So after rewiring the control signals to the RAM using the same > > control > > lines as Nicholas had used I was ready to do another test. It still > > had the > > same problem (but less often, now only about every 4000 writes). I > > ended up > > fixing it by delaying the /CS1 signal to the RAM by sending the signal > > through a couple of NAND gates and now the cct works fine, Nicholas > > used a > > 74HC139 in his project, maybe that delayed the /CS1 signal enough? I > > wonder > > if Nicholas had a similar problem when he designed his project? > > > > By the way there where only two examples I could find of a 6510 > > connected to > > static ram, one was Auto-RAMDOS and the other was the UltiMax designed > > by > > Commodore. > > John West and I built a 128k ram expansion once, but never found the > time to work out why it completely failed to work.. > > > > > I guess the next step for me is to decide on what features will go > > into the > > redesign of the video cct. > > trapezoid fill ;) > > (a slice of a triangle with horizontal top and bottom edges) > > > > > > ----- Original Message ----- > > From: "Christopher Phillips" <firstname.lastname@example.org> > > To: "Hatch" <email@example.com> > > Sent: Thursday, February 03, 2005 3:38 AM > > Subject: Re: C64 GRAPHICS CARD > > > > > >> > >> On 2 Feb 2005, at 21:41, Hatch wrote: > >> > >>> I've been on holidays the last few days so I finally interfaced my > >>> graphics cct to my 64, now my C64 has a brand new graphics mode :) > >> > >> Awesome :) > >> > >> > > > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing list
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