<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 14 Jan 2009, at 10:01, Nix wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>I see no fundamental reason why the CIA chips' timers couldn't have been<br>used for this purpose: they can generate interrupts, which is<br>sufficient. It's not as if the (nicely hookable but otherwise braindead)<br>BASIC used those timers for anything.</div></blockquote><div><br></div>Even the video interrupt would work fine - that was what I was actually originally thinking of, mainly because it needed to set up a video interrupt anyway to tie the sprite animation to the VBR to avoid flicker, but I might as well admit I'd also completely forgotten about the CIA timer interrupts. Probably because all I ever used myself was the video interrupt since my coding on the C64 was mostly demo type stuff full of syncing to specific raster lines, as most C64 demos..</div><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br class="Apple-interchange-newline"></div><div>Vidar</div><div><br></div></div></span></div></body></html>