From: classiccmp(a)u.washington.edu To: Manney Subject: RE: Computers (fwd) Date: Monday, August 18, 1997 9:30 PM Press, ISBN 1-55615-321-X: For Switch #1: Switch 1: number of drives, ON=drives installed, OFF=no drives (see switch 7/8) Switch 2: Not used, must be ON Switch 3 & 4: Memory on system board ON ON = 16K (PC1) or 64K (PC2) OFF ON = 32K (PC1) or 128K (PC2) ON OFF = 48K (PC1) or 192K (PC2) OFF OFF = 64K (PC1) or 256K (PC2) Switch 5 & 6: Display adapter ON ON = no adapter OFF ON = CGA 40 ON OFF = CGA 80 OFF OFF = MDA or >1 adapter Switch 7 & 8: Floppy drives ON ON = 1 drive OFF ON = 2 drives ON OFF = 3 drives OFF OFF = 4 drives For Switch #2 (some obscure combos not typed in) Switches 1-5: Memory Installed ON ON ON ON ON = 16-64K (Switches 3 & 4 control total memory) OFF ON ON ON = 96K (for this and below switches 3 & 4 should be OFF) ON OFF ON ON ON = 128K ON OFF OFF ON ON = 256K ON ON ON OFF ON = 320K ON OFF ON OFF ON = 384K ON OFF OFF OFF ON = 512K ON OFF ON ON OFF = 640K Switches 6-8: Not Used, must be OFF (switch 7 reserved for 8087 on PC2) Kai