binder@dec-dosadi.UUCP (06/08/84)
In response to question by John Antypas: It is most certainly possible to apply a standard $40-$60 keyboard to an Apple. My own machine is an Apple ][+, or at least it thinks it is - I built it from Apple schematics. The keyboard is a George Risk Industries model 771. The only considerations to watch are that the keyboard must be configured for a positive-going LEVEL (not pulse) strobe, and that there is a latch of some sort for the keyboard data, either internal to the keyboard or added to the Apple. I used a 74LS373 - tie the strobe to the latch enable, and ground the output enable. It's nice, too, to make the right arrow key work properly - that takes a couple of cuts and jumpers, because most keyboards' right-arrow keys transmit a <TAB> character (Ctrl/I) instead of the Ctrl/U that the Apple wants. It's nothing very difficult, at least it wasn't with the GRI 771, but having a schematic for the keyboard is useful.