Subject: Miata hardware description
To: None <email@example.com>
From: Hal Murray <firstname.lastname@example.org>
Date: 09/16/1999 02:56:33
Here is a first pass at the Miata hardware description I promised
a while ago. Sorry it took so long.
Currently, there is pretty good info out on:
I started with the description for another machine and did a lot
of editing. I hope somebody will double check this.
Personal Workstation (Miata) 600a, 600au (and other speeds)
CPU-specific support for Personal Workstation was written by Andrew Gallatin.
The Personal Workstations are Digital's PCI-based workstations in
small deskside boxes. They use the 21164 EV5 and EV56 versions of
The a versions come with IDE disks for running NT. The au versions
come with SCSI disks for running Unix and VMS.
There are 2 generations of the motherboard. The first one had separate
versions for the a vs au systems. The second generation (Miata-GL)
uses the same board on both systems.
The Miata-GL uses the EV56 chip with byte/word instructions. Earlier
versions used the EV5 chips. This description is for the Miata-GL.
The 600au model includes the following hardware:
DECchip 21164(A)/EV56 CPU (with BWE)
DECchip 2117x Core Logic Chipset (Pyxis)
It uses SDRAM simms.
DECchip 21043-based PCI Ethernet - UTP
21154 PCI-PCI Bridge
2 64 bit PCI slots (only some devices work - see bugs below)
3 32 bit PCI slots behind the bridge
3 ISA slots shared with the 32 bit PCI slots
Qlogic ISP 1040B Ultra(20MHz)/Wide SCSI controller
Packaged au systems normally include a SCSI disk.
Contaq Microsystems 82C693 PCI-ISA Bridge and IDE+USB controllers
Packaged a systems normally include an IDE disk.
ATAPI CDROM drive
Floppy disk controller with one 1.44MB floppy disk drive
Two NS16550 UARTs
PS/2-style keyboard and mouse
Windows Sound System compatible sound hardware
MC146818-compatible battery-backed clock and timer
NetBSD/alpha supports all of the standard system hardware listed above.
NetBSD/alpha also supports other PCI and ISA devices on Personal
Workstations, as described on the PCI and ISA hardware support pages.
Known Hardware-specific Bugs
The following are the known bugs in NetBSD/alpha's support of the
PCI DMA reads that cross a page boundary don't work right.
This is not a problem for the 32 bit slots because PCI-PCI bridge
breaks transfers at a convenient place. The firmware knows
about some PCI devices that work OK. It refuses to enable other
devices if they are in a 64 bit slot.
32bpp frame buffers (e.g. the ZLXp-E2 and ZLXp-E3) are not currently supported.