joost@neabbs.UUCP (JOOST BOERHOUT) (08/01/90)
Hi netters,
I want to design my own SCSI interface (hardware and software) for
the Amiga market. Although I have a some information about SCSI
I'd like to have the full documentation found in the ANSI X3T9.2
specs. Does anyone know how I can obtain these ?
Futhermore, I took a serious look at the Am5380 SCSI controller
from Advanced Micro Devices. Does SCSI really have to be
implemented that ugly ?? I bet someone knows a better chip, please
let me know.
- joost -garyf@wiis.wang.com (Gary Field) (08/03/90)
joost@neabbs.UUCP (JOOST BOERHOUT) writes: > Hi netters, > I want to design my own SCSI interface (hardware and software) for > the Amiga market. Although I have a some information about SCSI > I'd like to have the full documentation found in the ANSI X3T9.2 > specs. Does anyone know how I can obtain these ? > Futhermore, I took a serious look at the Am5380 SCSI controller > from Advanced Micro Devices. Does SCSI really have to be > implemented that ugly ?? I bet someone knows a better chip, please > let me know. > - joost - I don't have the info handy but I know where you can find out. Call the Common Access Method / SCSI BBS at (316) 636-8700. There is a message on there that tells how to obtain paper copies of the various SCSI specs. As for the selection of a SCSI controller I'd probably choose the NCR 53C94. Performance is quite high and seems pretty bug free. Whatever you do, do NOT use a WD 33C93! That chip seems great until you start handling all the error conditions. The 5380 is strictly a low cost device that is OK for low performance devices, but will not do a nice winchester justice. It requires too much software intervention for handling each bus phase. Now that I've told you all this, I must ask, do you really want to design yet another SCSI controller? There must be > 10 on the market already! If you do, do me a favor and adhere to the new ANSI CAM/SIM spec for the driver interface, this will allow others (like me) to add their own drivers for oddball devices without having to rewrite everything from scratch. GOOD LUCK! /*=========================================================================== | Gary A. Field - WA1GRC | GGG A RRRR Y Y FFFFF | Wang Labs M/S 019-72B | G G A A R R Y Y F | 1 Industrial Ave | G A A R R Y Y F | Lowell, MA 01851-5161 | G GG AAAAA RRRR Y FFFFF | (508) 967-2514 | G G A A R R Y F | email: garyf@gfield.wiis.wang.com | GGGG A A R R Y F |---------------------------------------------------------------------------- | Anything not worth doing, is not worth doing well. ============================================================================*/
jep@mtiame.oz (Jesper Peterson) (08/03/90)
In article <428644@neabbs.UUCP| joost@neabbs.UUCP (JOOST BOERHOUT) writes: | Futhermore, I took a serious look at the Am5380 SCSI controller | from Advanced Micro Devices. Does SCSI really have to be | implemented that ugly ?? I bet someone knows a better chip, please | let me know. There has been some favourable comments on a new NCR SCSI chip in comp.periphs.scsi (or whatever it's called), it would probably be worth your while to post/read that group. -- ACSnet: jep@mtiame.mtia.oz UUCP: ...!uunet!munnari!mtiame.oz!jep [Diamanda Galas] Makes Nina Hagen look like Kylie Minogue. - katefans@world.std.com (Chris'n'Vickie of Kansas City)
terry@helios.ucsc.edu (Terry Ricketts) (08/03/90)
In article <254@mtiame.oz> jep@mtiame.oz (Jesper Peterson) writes: >In article <428644@neabbs.UUCP| joost@neabbs.UUCP (JOOST BOERHOUT) writes: >| Futhermore, I took a serious look at the Am5380 SCSI controller >| from Advanced Micro Devices. Does SCSI really have to be >| implemented that ugly ?? I bet someone knows a better chip, please >| let me know. > >There has been some favourable comments on a new NCR SCSI chip in >comp.periphs.scsi (or whatever it's called), it would probably be >worth your while to post/read that group. >-- A few months ago a file appeared on some BBS's describing someone elses implementation of a SCSI controller for Ami. It was called AmScsi.arc. It has a text description and a schematic. The implementation was quite simple & (I believe) used a National Semiconductor part. If you can't find it & are interested I will send it on to ABF20 (or whatever its called) the replacement for Xanth. I would send it to you via mail but have difficulty getting mail to UUCP sites to make it without bouncing. If you want the written specs on SCSI they are available as ANSI X3.131-1986 from the American National Standard for Information Systems, 1430 Broadway, New York, NY, 10018. | Terry Ricketts | Internet: terry@helios.ucsc.edu | Senior Electronics Engineer | loel@helios.ucsc.edu | Lick Observatory Electronics Lab | Phone: 408-459-2110 | University of Calif, Santa Cruz |