Date   : Wed, 13 Jan 1993 19:50:49 GMT
From   : agate!spool.mu.edu!torn!utzoo!censor!isgtec!gerrit@ucbvax.Berkeley.EDU (Gerrit Visser)
Subject: re: hard disks for CPM

A bit late in responding but it took me a while to find my
documentation.

There are several options for HD add-ons to S-100 systems.  

I use(d) a DTC S-100 SASI interface board connected to an OMTI controller.
This gave me 2 5.25" floppies and 2 ST-506 hd's.  The Xebec 1410 and Sysgen
series would also work, they were all SASI interfaced.

The DTC SASI interface supported DMA but the board was generally shipped
with no DMA logic installed.  It should be possible to use an 8255 or
the like to build a polled IO SASI interface.

A second option is/was the XCOMP ST/S and ST/R.  The ST/S was for S-100
systems, ST/R for 'other'.  The ST/R was installed by adding an adapter
between the original Z80 in your CPU and the ST/R controller set.

If someone is particularly interested in the SASI interface option, I
have several OMTI and Xebec controllers.  I still have a DTC SASI
interface but the decision to get rid of it is pending :-)

--
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