IBM's braindead decision to have 5 (instead of 8)
expansion slots meant
that aftermarket "multifunction" cards became quite popular.  MANY of
them advertised SIX functions; after memory, serial, parallel, and
joystick, how many people remember what purported to be the other two
functions? 
clock and ??? memory fade.
Dan
But the original $1320 5150 was devoid of drives and cards.   ** FS
(after I back off all of the mods and put the original pieces back in) **
--
Fred Cisin                      cisin(a)xenosoft.com
XenoSoft                        
http://www.xenosoft.com
2210 Sixth St.                  (510) 644-9366
Berkeley, CA 94710-2219