Topic : Chips 'n Chips Author : Michael Ruge Version : chips_x.hyp (01/05/2001) Subject : Dokumentation/Hardware Nodes : 1505 Index Size : 35662 HCP-Version : 3 Compiled on : Atari @charset : atarist @lang : @default : @help : @options : -i -s +zz -t4 @width : 75 View Ref-File Der ACB-4000A MFM-zu-SCSI-Controller von Adaptec Note: This board does not connect directly to the host's bus. Instead, it allows a SCSI host adapter to control up to 2 MFM drives. The SCSI host adapter connects to this board, which in turn is connected to up to 2 MFM drives. Drives: 2 MFM drives (see note above). J0 Drive 0 data connector. J1 Drive 1 data connector. J2 HD control connector. J3 DC power connector. J4 Internal SCSI connector (to SCSI host adapter). P - K Pulse select protocol used by SASI standard. K - L (Default) Level select protocol use by SCSI standard. PU - R Precomp disabled for both drives. R - S Precomp begins at RWC cylinder for both drives. R - T Precomp enabled on all tracks for both drives. J5 -1 Open SCSI ID 0. Closed SCSI ID 1. Open SCSI ID 2. -2 Open Open Closed -3 Open Open Open Closed SCSI ID 3. Open SCSI ID 4. Closed SCSI ID 5. Closed Open Open Open Closed Closed Open SCSI ID 6. Closed (Default) SCSI ID 7. Closed Closed Closed Closed -4 Open DMA xfer rate = DATACLOCK / 2. Closed DMA xfer rate = SYSCLOCK / 4. -5 Closed Extended command set enabled (should be used only when replacing SASI controllers). Open (Default) Extended command set disabled. -6 Reserved. -7 Closed Support for drives that drop the SEEK COMPLETE signal when switching heads (ie. Syquest 312 and DMA 360). Open (Default) SEEK COMPLETE supported not necessary. -8 Open Default - Diagnostic mode disabled (normal operation) Closed Manufacturer diagnostic mode enabled. Terminators: Default is installed. If this is not the 1st or last in a series of SCSI devices, or if inline terminators are in use, remove both terminating resistor packs. Kapitel Der ACB-4000A MFM-zu-SCSI-Controller von Adaptec, Seite 1