https://zimmers.net/anonftp/pub/cbm/schematics/computers/c128/index.html 310378-1-left-and-right.gif2024-01-22234874 310378-2-left-and-right-7a.gif2024-01-22310087 310378-2-left-and-right.gif2024-01-22211264 310378-3-left-and-right-7a.gif2024-01-22269038 310378-3-left-and-right.gif2024-01-22212042 310378-4-left-and-right.gif2024-01-22187857 These are the schematic diagrams of the Commodore 128 main board ("flat C128" and C128D in plastic case). They were on eight pages in the Commodore 128 Programmer's Reference Guide, two pages containing one engineering sheet. 310378-update.zip1998-05-15747229 Update to the Commodore 128 Service Manual, containing the two revised pages in the 310378 schematic revision 7A. 8721-pla.v2022-01-0510319 8721 PLA in Verilog by Johan Grip c128cr.jpg2000-02-231115174 A black&white picture of a cost-reduced flat Commodore 128 circuit board. This model never entered mass production; this is an engineering sample possessed by Raymond Carlsen. The board says "PCB ASSY NO. 250783", "C= commodore C128CR REV.3", "PCB NO. 252270", and "C128CR No.2 ENG. SAMPLE Jun/9/'86 KNT". c128dcr-1-left_and_right.gif2024-01-22270044 c128dcr-2-left_and_right.gif2024-01-22298214 c128dcr-3-left_and_right.gif2024-01-22264840 c128dcr-4-left_and_right.gif2024-01-22126626 c128dcr-5-left_and_right_corrected.gif2020-10-192128158 These are the schematic diagrams of the Commodore 128DCR main board (metal case C128D with built-in 1571CR floppy controller). The diagrams were scanned from a 64'er Sonderheft, and they appear to be a copy of schematic 252451. According to Nicolas Welte, there is an error on the right half of page 5. The 74LS14 hex Schmitt-trigger inverter U113, pin 13 is connected to WPRT* (misprinted WTRT* on U105), which doesn't make any sense. Obviously it should be connected to STP1 instead, which is three lines more to the right! c128schematic.gif2018-05-17752001 C128 schematic, unknown rev, drawn by unknown author. mainboardC128_rev7.png2019-11-0412004815 Hi-res picture of 128 main board traces, without chips. parts.txt2015-07-081830 Parts list for Commodore 128, from William Levak