Scheme for connecting C-128D keyboard to C-64, part I ----------------------------------------------------- Copyright (c) '96 by Daniel Krug +- keyb. connector and/or Sub-D25, female for ext. keyb. | | N +-> o o o o o o o o o o o o o o o o o o o o | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-+ | | | | | | | | | | | | | | | | | | | v v v v v v v v | | | | | | | | | | | - - - - - - - - +--+-+-+-+-+-+-+-+-o-+-+---------+ | | | | | | | | | | | | | | | | | | | | +-+-+-+-+-+-+-+-+--+ | | | | | | | | | | | | | | | | | | | | | | | | | | | o---+-+--xxxxx--o +-O-O-O-O-O-O-O-O-O-+ | | | | | | o-+---+-+--xxxxx--o | . | | | | | | o-+-+---+-+--xxxxx--o | . | | | | | o +-+-+---+-+--xxxxx--o | . 74HC541 | | | | o-+-+-+-+---+-+--xxxxx--o | ............... | | | o-+-+-+-+-+---+-+--xxxxx--o | . . | | o-+-+-+-+-+-+---+-+--xxxxx--o +-O-O-O-O-O-O-O-O-O-+ o-+-+-+-+-+-+-+---+-+--xxxxx--o | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-+-+---------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-----+-+-+-+-+-+-+-+-+-+-o-+ | | | | | | | | | | | | | | | | | | | o o o o o o o o o o o o o o o o o o o o 7 1 2 3 4 5 6 0 0 1 2 7 4 5 6 3 V | G \ \ \ \ \ \ \ \ / / / / / / / / / / / <-- flat cable \ \ \ \ \ \ \ \ / / / / / / / / / / / o o o o o o o o:o o o o o o o o:o o o o <-- keyboard 7 1 2 3 4 5 6 0:0 1 2 7 4 5 6 3:V Re G connector : : ^ : | : | PA PB | | v \__________________ _________________/ \/ CIA #1 G = ground N = N.C. V = +5V xxxxx = 10kohm resistor | v = diode 1N4148 - | Marc-Jano Knopp on 97/01/11 This is part of http://mjk.c64.org/c64.html