Often I get the question if SRM supports external call buttons. Well ofcourse it does! :-)

SRM supports call buttons, external and internal. You can use the spacebar as a call button, but you can also connect external call buttons.
 
The external call buttons can be any "short circuit" button (like a doorbell button or a button of an old joystick). Connect this button to a GROUND pin and one of the DATA IN pins (10, 11, 12, 13 or 15) of the parallel port using a 200k resistor in line to prevent a short circuit.
 
So in other words:
 
GROUND PIN --- BUTTON --- 200ohm RESISTOR --- PIN 10/11/12/13/15
 
Installing SRM on a computer is not that difficult, but you will need a TRUE MS-DOS machine. If you have a Windows machine, you can achieve this by creating a small second partition on which you can install MS-DOS and SRM. Install a boot selector that will allow you to choose what you want to boot: Windows or MS-DOS.
 
if you have any more questions, feel free to e-mail me!