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- Date: 23 Feb 1994 10:03:32 +0100
- From: Egbert Jan van den Bussche <busscheh@ksepl.nl>
- Subject: xfs in general.
- To: mint@terminator.rs.itd.umich.edu
- Message-Id: <01H97X7JD8O28ZFGM5@ksla.nl>
- X-Vms-To: AMSW32::IN%"mint@terminator.rs.itd.umich.edu"
- X-Vms-Cc: KS919
- Mime-Version: 1.0
-
- Hello to you all!
- Maybe nobody ever heard of them but about 10-12 years ago an US based company
- called Technical Systems Solutions (TSC) wrote a multi-user multi-tasking OS
- for a 6809 (8bitter!) and somewhat later for a 68000 (never had this version).
- The hardware was from South West Technical Products Corp. (SWTPc). The memory
- went up to 768K for the 6809 system using a clever banking system with two
- high speed static 16 x 16 byte RAMS (SN74189 for the interested...) where the
- 4 upper address lines (4K chunks) where translated to 8 lines. By loading 16
- bytes in the fastram any combination of 4 - 64 K RAM could be given to a task.
- The 4 K chunks could come from anywhere in the 20 bit address space. All I/O
- was interrupt driven. The complete kernel took about 24K including drivers for
- DMA 8"/5" floppies, DMA harddisk via a predecessor of SCSI (SASI), 8 TTY ports
- parallel printer port, serial printer port. The OS called UniFLEX was very
- closely modelled after UNIX version 6/7. I never nad the real source of UniFLEX,
- only via disassembly, but still you could see the the resemblance with the C
- source of UNIX V6/7.
-
- I have no idea if TSC and/or SWTPc are still in existance but now realize how
- far ahead they were with their UniFLEX software running on well designed
- hardware. TSC is/was located in Chapel Hill NC, SWTPc is/was in San Antonio TX.
-
- Sorry for all this drivel but when I think of that time I wonder if MiNT on
- better hardware (fully interrupt driven, good memory managenent unit etc.)
- wouldn't be much better off and fit for the job. Don't misunderstand me;
- I don't hate ATARI at all. I have a 520/4Mb/145Mb and a 1040/4MB/210Mb both
- running TOS 2.06 and I love them and the software running on them (mostly
- WORKS, GNU and MiNT).
-
- I was in a nostalgic mood, sorry.
-
- Egbert Jan
-
- -------------------------------------------------------------------------
- Egbert Jan van den Bussche VAX/VMS SHELL Research Rijswijk,
- tel. +31(0)70-3112657 ATARI Postbus 60,
- Email: busscheh@ksepl.nl VAX/VMS 2280 AB Rijswijk, Holland (NL)
- -------------------------------------------------------------------------
-