From prhunt@dyson.brisnet.org.aus Mon Jun 11 09:07:19 2001 Date: Wed, 16 May 2001 20:15:25 +1000 From: Paul R. Hunt To: William F. Maton Subject: Re: Announcing an SB180 web page On Tue, 15 May 2001 20:41:02 -0400, in comp.os.cpm you wrote: >Hi > First time poster, etc. Just wanted to let everyone here know that >there's a new web page describing the Micromint SB180 and companion >boards. Any feedback would be appreciated. Enjoy, and here's the web >site: > > http://www.miredespa.com/wmaton/sb180/ > >I doubt the web crawlers have hit it yet, so google and company probably >haven't indexed it yet. Interesting read! Know of anyone with a spare GT180? BTW, the SB180FX does work with the 18MHz Z180, but there are compromises: 1 - RAM access. I have 60nsec RAM in place. With 9.216MHz, 0 waits. Need to insert 1 wait at 18MHz. 2 - Floppy disk I/O. Controller does not seem to operate at 18MHz. Work around is temporarily slowing the CPU during disk IO BUT, this messes with clock timing and any serial IO going on. A while ago, I started doing a SCSI-2 driver for the SB180FX, to access a greater range of disks/peripherals. THE NCR53C80 is a fairly common SCSI interface chip, and I got some basic driver routines going (think I "ported" them from some Linux C source code to ASM!), but lost interest before attempting to graft them into a BIOS. Starting to regain interest, and have a CP/M 3 BIOS a friend did, that I think I'll mess with for fun. Just my $0.02. All the best for the site! Paul.