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Doc64 #26 | Commodore C64 | What's the PLA for and how does it work?

Videobeschreibung: Today I want to show you ... - What is the PLA (Programmable Logic Array)? - What is the PLA for? - What is the PLA's job? - How does the PLA work? - What is inside the PLA? - Are there replacements for the PLA? - Measuring the signals at the PLA - Measuring CAS, CASRAM, AEC, ROMH, ROML, VA12, VA13, VA14, KERNAL, BASIC, CHAROM, IO, BA, GR/W, R/W, EXROM, HRAM - PLA 906114-01, MOS 906114-01, Signetic 82S100 - PLA U17 PLA alternatives: - EPROM+adapter (best suited EPROM: STMicroelectronics M27C512-90B6) - realPLA (by ‚skoe‘ Thomas Giesel) https://www.c64-wiki.de/wiki/realPLA - SuperPLA V4 (by Jens Schönfeld, INDIVIDUAL Computers) https://icomp.de/shop-icomp/de/shop/p... https://amigastore.eu/152-superpla-v4... - PLA20V8 consists of two GAL20V8B - PLAnkton https://www.polyplay.xyz/PLAnkton-PLA... And many more … Have a look at c64os.com/buyersguide/ Sources: C64 memory map: https://www.c64-wiki.de/wiki/PLA_(C64...) https://www.c64-wiki.com/wiki/PLA_(C6...) C64 PLA dissected: http://skoe.de/docs/c64-dissected/pla... by Thomas ‚skoe‘ Giesel VERSA Cart and C64 ROMs (C64 OS Homepage by Gregory Nacu): http://www.c64os.com/post/versa64cart Standard Memory Configuration C64 PLA: William Levak and Ann Arbor, 1986, Commodore 64 Memory Configurations, The Transactor, Volume 6, Issue 05, p. 51-55. Picture „Standard Memory Config“: http://zimmers.net/anonftp/pub/cbm/ma... All mem configs from page p051.jpg to p057.jpg on zimmers.net: http://zimmers.net/anonftp/pub/cbm/ma... Picture „EPROM as PLA replacement“: http://www.vic20.de/html/eprom_pla_82... PLA fault screens: https://www.pictorial64.com/ Sven Petersens Block Diagram http://tech.guitarsite.de/c64_block_d... Sven Petersens Osciloscope Screenshots http://tech.guitarsite.de/c64_scope.h... Helpfull links: https://www.pictorial64.com/ Trouble Shooting and Repair Guides: https://archive.org/details/Commodore... https://archive.org/details/C64-C64C_... My Twitter Account:   / doktor643   Music: - Shades, 1986, 64er Markt&Technik by Chris_Huelsbeck