The twenty forth in a series of videos to create a retro Intel 8088/8086 PC on solderless breadboards and learn about how computer hardware and software works. In this video we continue to turn the current Breadboard 8088 computer into a PC compatible one able to run MS-DOS. This includes fitting the system clock PLD, wiring in the boards created in part 1, testing the Power On Self Test port and configuring a BIOS to download into RAM for testing. Sergey Kiselev 8088 BIOS https://github.com/skiselev/8088_bios 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 2:18 Schematic review for system clock PLD 3:19 System Clock PLD layout 3:44 System Clock PLD Configuration 5:37 IO Decoder PLD Configuration 6:19 Add System Clock PLD to CPU Board 9:17 Test Video Controller and POST Port 10:42 Wire in new boards 12:52 Test Speaker 14:04 Test POST Port 80 15:48 Configure & Build BIOS 17:53 Load and Run BIOS 19:57 Summary and Next Video