The twenty first in a series of videos to create an Intel 8088 PC on solderless breadboards and learn about how computer hardware and software works. In this video, part 9 of the MDA video controller we do more testing and fix an attribute timing issue on our way to building an IBM PC compatible Monochrome Display Adaptor (MDA). MDA Info https://www.seasip.info/VintagePC/mda.html VGA & CGA Colours & Brown https://www.aceinnova.com/en/electronics/cga-and-the-brown-color-in-ibm-5153-color-display/ Better RGB Values for CGA https://int10h.org/blog/2022/06/ibm-5153-color-true-cga-palette/ IBM Technical Reference Guides IBM Monochrome Display and Printer Adaptor https://minuszerodegrees.net/oa/OA%20-%20IBM%20Monochrome%20Display%20and%20Printer%20Adapter.pdf PC-XT https://www.pcjs.org/machines/pcx86/ibm/5160/ PC-AT https://www.pcjs.org/machines/pcx86/ibm/5170/#documents 8088 Project Github https://github.com/breadboardinglabs/Breadboard8088PC Breadboarding Tips https://www.youtube.com/watch?v=nVtszJ8y_74 Improving Breadboard Power https://www.youtube.com/watch?v=LJlSzwSC8sk Breadboarding Introduction Video "Prototyping and Experimenting with Breadboards" https://www.youtube.com/watch?v=Y36g0TNkpvk 6809 Project Videos Nanocomp 6809 Introduction Video https://www.youtube.com/watch?v=oNCKHvTz3Cg Breadboard VGA in 15 minutes runs Tetris https://www.youtube.com/watch?v=tT2X9yMkr_4 Nanocomp 6809 in 10 Minutes https://www.youtube.com/watch?v=jTfk6MR-70I Nanocomp 6809 on Hackaday.io https://hackaday.io/project/188095-nanocomp-6809-8-bit-retro-computer-on-breadboards. Chapters 0:00 Introduction 0:29 Attribute timing issue 1:43 Logic Analyzer investigation 6:55 Clock PLD changes VA0 timing 8:17 Test VA0 changes 11:35 Attribute and Shift Register latch timing changes 13:05 Latch changes testing 14:31 Mono Attribute testing 16:22 Colour output testing 18:40 Summary and next video