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" <shrydar@jaruth.com>
To: <cbm-hackers@ling.gu.se>
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" <hatch@in.com.au>
> > Date: 3 February 2005 19:09:34 GMT+08:00
> > To: "Christopher Phillips" <shrydar@jaruth.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" <shrydar@jaruth.com>
> > To: "Hatch" <hatch@in.com.au>
> > 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
>
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