4 ms·
If you program a register at a moment and in a way that causes two signals to "collide", the result effectively depends on transistor behavior. That in turn can
by bonzini 1y ago
If you program a register at a moment and in a way that causes two signals to "collide", the result effectively depends on transistor behavior. That in turn can be temperature dependent.
For an example on the PC see https://int10h.org/blog/2023/03/cga-6845-crtc-phantom-vsync-glitch/ https://int10h.org/blog/2023/03/cga-6845-crtc-phantom-vsync-...
- creatonez 1y agoThanks. Transistor level race conditions will keep me up at night.
- kaoD 1y agoAmazing link. Thanks for sharing. Where can I find more writeups like this?
- mrandish 1y agoThat was a fun rabbit hole. My first computer (8-bit, 4k RAM, 0.8 Mhz) had a video chip related to that 6845, the 6847, which was (sadly) a somewhat lower cost, less capable, less interesting chip.