Date   : Tue, 13 Aug 1985 12:42:29-MDT
From   : Rick Conn <RCONN@SIMTEL20.ARPA>
Subject: Re: HD64180 boards

I'm working on an SB180 board (Steve Ciarcia's design) now.  SUPER board.
This 7 1/2" by 4" SBC has an HD64180, 256K bytes RAM, 2 RS-232C drivers,
1 parallel port, and a floppy disk controller for 3 1/2", 5 1/4", and 8"
floppies.  All running the Z System with a RAM disk.  Clock speed is 6+ MHz.

Note that by using the HD64180, the HD64180 ALONE has 64 I/O ports internally,
providing 2 UARTs (RS-232C line drivers are off-chip), one clocked
serial port, 2 timers/counters, 2 DMA controllers (mem-to-mem,
mem-to-io, and mem-to-mem-mapped-io transfers), and a 12-level
priority interrupt controller.  Most impressive.

Finally, the new Echelon ZAS assembler (a Z System tool) assembles the
extended instructions for the 64180, and the ZDMH debugger helps
debug, recognizing 64180 instructions.  So there is a toolset to
support 64180 development available now as well.

       Rick