youtu.be
8bit-times: PET video output Pt2 (Ep.31)
This video presents how the Commodore PET with a CRTC chip - as it is known from PC CGA and other cards - create the video output. === SORRY ABOUT THE AUDIO - I got a new Mic and managed to get some clipping - will be better next time It is loosely based on part 1, where I explain the Commodore PET video output for those machines whithout CRTC, but can also be viewed on its own. Part 1: https://youtu.be/pwb5GvmoAFE Test programs shown in this video (do NOT run! for demonstration purposes only!): https://github.com/fachat/8bittimes/tree/main/Ep31-PET-video-part-2 PET 8032 board schematics: http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/8032/index.html PET 8032/4032 universal board schematics: http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/univ/index.html Commodore CRTC 6545-1 datasheet: http://archive.6502.org/datasheets/mos_6545-1_crtc.pdf Other CRTC test programs (for the 8296, not shown): http://www.6502.org/users/andre/hwinfo/crtc/pet/index.html Steve Gray's Colour-PET: http://cbmsteve.ca/colourpet/index.html Sections: 00:01:12 Recap Part 1 00:02:49 Character set demo 00:04:03 Racing the beam demo 00:11:20 CRTC models 00:16:26 CRTC demos 00:34:21 Theory of operation 00:37:37 High level timing example 00:42:59 The Colour PET 00:44:57 Schematics Deep Dive 01:00:24 Detailed Timing 01:08:55 Outro
