From: Hatch (hatch_at_in.com.au)
Date: 2005-02-03 14:56:30
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. I guess the next step for me is to decide on what features will go into the redesign of the video cct. ----- Original Message ----- From: "Nils Andreas" <email@example.com> To: <firstname.lastname@example.org> Sent: Thursday, February 03, 2005 12:18 AM Subject: Re: C64 GRAPHICS CARD Message was sent through the cbm-hackers mailing list
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