Memory Map for Poly 88 (used with Polex and North Star or Micropolis FDC) 0000-0FFF: System RAM board overlaid by 3K of PROM and 1K of RAM on the Poly-88 CPU board. Phantom support required on the system RAM board. 1000-E800: System RAM board E800-EFFF: Hole for North Star Floppy Disk Controller (single or double density) F000-F800: System RAM (used by Polex) F800-FC00: Poly-88 Video RAM FC00-FFFF: Hole for Micropolis Floppy Disk Controller (at FC00 instead of F800) Based on the above Memory Map, system RAM should be configured as follows: (CompuPro RAM 17 used as an example) - Configure for 64K (not extended addressing) by setting S2-GL on and removing U5. - Set for no front panel: S1-W (MWRITE) off and S1-S (SOUT) on - Phantom enabled: S2-PH on - F800-FFFF disabled for Micropolis FDC (S1-F8 off) - E800-EFFF disabled for North Star FDC (S1-E8 off)