dr@ski.UUCP (David Robins) (12/16/87)
In article <> bill@zehntel.UUCP (Bill Ellis) writes: >Is there any way you can simulate a open-apple command on a apple ][+ with >a ramfactor card installed, other then the ones for appleworks ? Let me first describe the apple buttons on the //e. The Open-Apple symbol on the //e is the same as closing SW0, and Closed-Apple is the same as closing SW1. There is no key for SW3. Sw#'s refer to the "game port" switch connections,and are sometimes referred to as PB0-PB2, for pushbuttons. On the //e these signals are available on both the 16 pin internal game I/O port, as well as the 9 pin D-connector on back. On the earlier Apples (][, ][+), there is only the internal game port. My joystick has two pushbuttons corresponding to SW0 and SW1. I PRESUME THAT USING THESE SWITCHES WILL LET YOUR SOFTWARE WORK, ASSUMING THAT IT CAN RUN WITH THE FIRMWARE OF THE EARLIER APPLES. To use the internal port then, either get a joystick, or make your own switches. Per the Apple manual, each switch input needs a 560 ohm pull-down resistor from the SW pin to ground, with a momementary-contact normally-open switch from the SW pin to +5V. All are available on the connector. GAME I/O PORT: 9 8 GND PDL1 10 7 PDL2 PDL3 11 6 PDL0 AN3 12 5 STB AN2 13 4 SW2 AN1 14 3 SW1/CL. APPLE AN0 15 2 SW0/OP. APPLE 16 1 +5 V / +5------/ o---|--/\/\/\/\-----GND | (560 ohm) | O (SW0 or SW1) -- ==================================================================== David Robins, M.D. (ophthalmologist / electronics engineer) Smith-Kettlewell Eye Research Foundation (previously known as: Smith-Kettlewell Institute of Visual Sciences) 2232 Webster St; San Francisco CA 94115 415/561-1705 (voice) {ihnp4,qantel,dual}!ptsfa!ski!dr The opinions expressed herein do not reflect the opinion of the Institute!