AlphaStation 200/400 Series

This document provides technical information for VARs, ISVs, and service providers configuring or adding features to Digital AlphaStation 200 and 400 Series systems. Both series are state-of-the-art workstations featuring DECchip 21064 or 21064A Alpha CPUs and the 21071-AA core logic chipset (cache/memory controller, PCI interface, data path).

Key shared features include:

• 512 KB secondary cache (SRAM)
• 8 to 384 MB RAM (DRAM)
• 1 MB flashROM, 8 KB NVRAM
• Keyboard, mouse, two serial ports, bi-directional parallel port
• Fast SCSI-2 controller
• Floppy Disk Controller (FDC)
• PCI and ISA expansion slots

Distinctions between the series include:

• AlphaStation 200 Series: Slimline desktop enclosure, 1 PCI-only slot, 1 ISA-only slot, 1 PCI/ISA combination slot, 4 drive bays (3.5-inch and 5.25-inch), embedded Ethernet LAN controller, and dedicated audio.
• AlphaStation 400 Series: Mini-tower deskside enclosure, 2 PCI-only slots, 3 ISA-only slots, 1 PCI/ISA combination slot, 5 drive bays (3.5-inch and 5.25-inch), and an external Ethernet LAN controller.

The document details system configuration (memory, mass storage, PCI/ISA expansion, jumpers), addressing schemes (cacheable, noncacheable, PCI sparse/dense memory spaces), I/O programming (flashbus, keyboard/mouse, TOY clock, Super I/O chip, interrupts), DMA channels, hardware interrupts (CPU, device, NMI, timer, HALTREQ, PCI), system power-up and initialization sequences, AlphaStation firmware (SROM, DROM, ARC, SRM features, LED/beep codes, console commands like ISACFG), fault management (error registers, machine check codes, error formats), and comprehensive connector and cable information, along with a list of system registers.