{"product_id":"plaster-c128-modern-mos-8721-pla-replacement-for-commodore-128","title":"PLAster c128 Modern MOS 8721 PLA Replacement for Commodore 128","description":"\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003ePLAster c128, PLA Replacement For MOS 8721, Commodore 128 \u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003eAvailable Now and made by:  \u003c\/span\u003e\u003c\/b\u003e\u003cb\u003e\u003cspan\u003eToTs\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003e\u003cb\u003e\u003cspan\u003eRETRO\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003ePLAster c128\u003c\/span\u003e\u003c\/b\u003e\u003cb\u003e\u003cspan\u003e,  \u003c\/span\u003e\u003c\/b\u003e\u003cb\u003e\u003cspan\u003eIs a Modern PLA Replacement For c128, c128D and c128DCR\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003eWhat is PLAster c128?\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003ePLAster c128\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e is a modern energy efficient, \u003c\/span\u003e\u003cb\u003e\u003cspan\u003eplug-and-play replacement\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e for the \u003c\/span\u003e\u003cb\u003e\u003cspan\u003eMOS 8721\u003c\/span\u003e\u003c\/b\u003e\u003cb\u003e\u003cspan\u003e PLA (Programmable Logic Array) chip\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e used in the Commodore C128.\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003eHow do I use the new PLAster c128\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eSimply remove the original MOS 8721 PLA in position U11 and insert your \u003cb\u003eNEW PLAster c128\u003c\/b\u003e in its place\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e When upgrading your chips I recommend putting Heat sinks on all your \u003cstrong\u003e\u003ci\u003eoriginal commodore \u003c\/i\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"color: #3c3c3c; font-family: Arial, sans-serif;\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003ci\u003echips\u003c\/i\u003e\u003c\/strong\u003e to help with heat dissipation, also if replacing a chip, I always like to put a socket into the board, this will raise your chip and reduce internal clearance because of this I generally do not put the original shield back and don't recommend this,\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan style=\"color: #3c3c3c; font-family: Arial, sans-serif;\"\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003eWhat is PLAster c128?\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003ePLAster c128 is a GitHub Open Source Project created by BackBit, that is openly available to everyone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003eWhat makes the PLAster c128 Awesome?\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eModern chip design allows for Low Energy Consumption and low heat\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eUses Exact Equations used in original MOS 8721\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan style=\"color: #3c3c3c; font-family: Arial, sans-serif;\"\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003cspan\u003e Mode: Switch allows cartridges to work in FAST mode\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eKERNAL Mode: Switch allows BackBit cartridge (and maybe others) to replace KERNAL ROM\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003ePRIVATE EYES Mode: Switch sets bus high to facilitate in-circuit testing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003eWhen Do I Replace My PLA?\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003eThe Original Commodore 128 PLA, the chip located in U11 usually fails from age and internal corrosion.  If your commodore 128 model is experiencing the common issues of a failed or failing PLA listed below, it may be time to upgrade your PLA. Issues can present as....\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eTotal Black Screen\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eGarbage Screen\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eSolid Screen Colors\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eFlashing\/Rainbow Screen\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eOverheating\/Temperature Spikes\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eUnstable Operation\/Unexpected Freezes\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003ePeripherals Unresponsive\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eIncorrect Memory Count\/Out of Memory\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan style=\"color: #3c3c3c; font-family: Arial, sans-serif;\"\u003e\u003cspan\u003e(if you need ram, I carry that as well in the \u003c\/span\u003e\u003cspan\u003elink\u003c\/span\u003e\u003cspan\u003e below)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003ca href=\"https:\/\/totsrc.com\/products\/commodore-64-64c-128-128d-ram-replacement-4164-10-16pin-dip-w-sockets-tested\" title=\"Commodore 64\/128 Ram\"\u003eCommodore Ram\u003c\/a\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eReplacing your PLA is a great start however, may not always fix your problems as RAM (U34-U45), MMU MOS 8722 (U7), VDC MOS 8563\/8568 (U22), VIC-II (U21), CPU MOS 8502 (U6) and Kernal\/Basic ROMs (u33,u34,u35) can produce overlapping faults and failures. Also MOS 8701(u8) and MOS 74ls257\/258 (u14\/u15) can cause similar issues.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003eIf you have a functioning original MOS chips, placing Heat Sinks on them to protect then from excessive heat can potential help them to last longer. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp align=\"center\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan\u003eAny Questions Please Do Not Hesitate to ask. \u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e \u003c\/p\u003e","brand":"ToTsRC\/ToTsRETRO","offers":[{"title":"Default Title","offer_id":49095611744499,"sku":"BB8721","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0619\/5239\/3459\/files\/PLASterc128.png?v=1779241866","url":"https:\/\/totsrc.com\/products\/plaster-c128-modern-mos-8721-pla-replacement-for-commodore-128","provider":"ToTsRC\/ToTsRETRO","version":"1.0","type":"link"}