shj@ames.arc.nasa.gov (Steve Jay) (04/21/89)
In v7n215, Richard Robison (rr%chmsr@gatech.edu) asks for switch settings for a Xylogics 753 + CDC Sabre 9720-850. We are running exactly this configuration on our 3/280 server with OS 3.3. The Xylogics 753 is set to the "Factory Configuration" except the Base Address is at eed0. The CDC Sabre 9720-850 "I/O Board" switches (see page 3-41 of the Installation and Checkout manual that came with it [CDC pub #83325710, rev. C]) are: switch setting Description 1A/1D, 1B/1D 1A & 1D Index/Sector pulses on A cable only RDY/POK RDY Normal I/O ready status T2/T1 T1 Enable Ext. Cyl. Addr. via Tag 1 E/O E SMD-E mode XA/N XA Extended Cylinder Addresses R/L L Local power on The "Control Board" switches (see page 3-46 of the manual) are: switch setting Description logical address --- [ whatever you want, probably 0 ] Sector switches (see below) # bytes in sector .8/1.6 1.6 Sector Clock Freq. 1.6 MHZ B/C B Byte frequency sector clock WP/N N not write protected RUNT jumper disconnected Runt sector pulses may appear SWP1 jumper connected Disable sweep only on seeks SWPD jumper connected Disable sweep cycles Switches & jumpers not mentioned are "don't care". For the Sector switches, we used 68 sectors per track, which works out to 604 bytes per sector according to the chart on page 3-77 of the manual (Byte clock round-down method). The switches are therefore O O C O O C O C C 0 C C C C, going from bit 0 to bit 13, with "O" meaning open, and "C" meaning closed. When formatting, we told it 1379 cylinders, 2 spare cylinders, 15 tracks, 67 sectors, 604 bytes/sec. Note that with the drive set for 68 sectors/track, but formatting for 67, there's room for one "slip" sector per track. We use the Xylogics supplied xl driver for our 3.3 system. We are told, but haven't yet tried, that the standard xd driver from Sun in OS 4 will handle this controller/drive configuration. Jim Budler (jim@eda.com) in v7n45, gives his experiences in using the same hardware under OS 4. My thanks to him, as that's where I got the confirmation about what sector size to use. Contact me if you need more information. Steve Jay domain: shj@ultra.com Ultra Network Technologies Internet: ultra!shj@ames.arc.nasa.gov 101 Daggett Drive uucp: ...ames!ultra!shj San Jose, CA 95134 408-922-0100