S-100 Floppy Disk Controller Survey August 1982 (Last Revision: 4 Sept 82) Manufacturer: SD Systems SD Systems NorthStar CCS InterSystems Board: Versa I Versa II MDS SD 2422A FDC II Controller: WD 1771B-1 WD 1791-1 (obsolete) WD 1793 NEC uPD 765A Max # Drives: 4 4 3 4 4 8" Drives: Yes Yes No Yes Yes 5.25" Drives: Yes Yes Yes Yes Yes Simultaneously: No Yes No Yes Yes Single Density: Yes Yes Yes Yes Yes Double Density: No Yes No Yes Yes Double Sided: Yes Yes No Yes Yes DMA Data Xfer: No No No No ??? Interrupts: Yes Yes ??? Yes Yes Serial Port: No No No No No Power On Jump: No No No No ??? CP/M Included: No No No Yes No BIOS Included: Yes Yes No Yes Yes Reliability: Fair Good Good Good Good Integration: Fair Fair Fair Easy Fair BIOS Quality: Fair Fair Poor Good Good Board Docs: Fair Fair Good Good Good Manufacturer: Morrow Des. Morrow Des. Morrow Des. Godbout Jade Board: DJ 1D DJ 2D/B DJ DMA Disk 1 Double D Controller: bipolar WD 1791-1 Z80/bipolar uPD 765A WD 1791-1 Max # Drives: 4 4 8 4 4 8" Drives: Yes Yes Yes (4 max) Yes Yes 5.25" Drives: No No Yes (4 max) Yes Yes Simultaneously: --- --- Yes No No Single Density: Yes Yes Yes Yes Yes Double Density: No Yes Yes Yes Yes Double Sided: No Yes Yes Yes Yes DMA Data Xfer: No No Yes Yes No Interrupts: No Yes Yes Yes Yes Serial Port: Yes Yes Diagnostic Diagnostic Yes Power On Jump: Yes Yes Yes No No CP/M Included: Yes Yes Yes Yes No BIOS Included: Yes Yes Yes Yes Yes Reliability: Fair Good Good Good Fair Integration: Easy Easy Fair Easy Difficult BIOS Quality: Good Good Good Good Fair Board Docs: Fair Good Good Good Fair Manufacturer: Tarbell Tarbell Micropolis MS & C Board: FDI-SD FDI-DD MacroFloppy DD-FDC Controller: WD 1771 WD 1791-1 bipolar uPD 765A Max # Drives: 4 4 4 4 8" Drives: Yes Yes No Yes 5.25" Drives: No No Yes Yes Simultaneously: --- --- --- No Single Density: Yes Yes Yes Yes Double Density: No Yes No Yes Double Sided: No Yes No Yes DMA Data Xfer: No Yes No Yes Interrupts: No Yes No Yes Serial Port: No No No No Power On Jump: No Yes No Yes CP/M Included: No No No No BIOS Included: Yes Yes No Yes Reliability: Good Good Fair Good Integration: Fair Easy Fair Fair BIOS Quality: Fair Good Fair Good Board Docs: Poor Poor Fair Good