The Collection

Release Date: 1993

CPU: Alpha AXP Model 21064 (EV4), 150MHz, 64bit

Memory installed:

Max. memory: 256MB, Fast Page Mode SIMMs

I/O Busses: Turbochannel, One SCSI-1 bus: 5MB/s

SN:

Story:

This entry-level workstation of the 3000-Series was given to me together with the PDP 11/04 by an institute of the Technical University of Darmstadt. Back then, they used four of these machines, which were connected to an Alphaserver 2100 via a small network.

This unit has not been tested, yet.

More pictures of the DEC 3000-300:


	The look of the desktop-case does not show anything surprising. On the right can be mounted a a diskette-, CD-ROM- or a tape drive. This unit was not used in standalone-mode, but was in a small network which consisted of four other Alpha 3000-300 workstations and an Alphaserver 2100.
On the back of the machine are all connections, workstations at that time offered. From left to right: External scsi-connector (a terminator is mounted on it, when not used), 10Base-2 network connector, serial-line, modem, Keyboard- and mouse-connector via a shared DB15-connector, DB25 connector for serial port with modem control, graphics-connector. Above the connectors are two turbo-channel-slots, which are unused. Different frame-buffers in addition to the onboard graphics and DSSI or SCSI-cards could be added. The onboard graphics used 2MB of VRAM and offered a fixed resolution of 1280 × 1024 at 72 Hz.
	Here is an overview of the internals of the workstations. A 1GB-SCSI disk is installed and connected to the SCSI-1 bus, which is reaaaally slow. Later models of the 3000-series had one or two SCSI-2 controllers.The pictures are pretty old. I really need to reshoot some good ones, sorry for that.
The CPU is mounted on a daughter board which is connected to the mainboard.
	The two white connectors are the Turbo-Channel slots. One slot per Turbo-Channel expansion card. in the Model 300, the Turbo-Channel-Bus was clocked at 12,5MHz, while its frequency was higher in othe models of the Alpha 3000-series systems. The 72pin memory SIMMs used were of type FAST Page. Using SIMM pairs of either 8MB (MS16-BA) or 32MB (MS16-DA), the memory could be configured from 16MB to 256MB in total.