Specifications

1.3 System Logic
The applicationDEC 400xP system consists of three logic modules (see
Figure 1–3):
• System board
• CPU module with optional plug-in cache (25 MHz and 33 MHz CPU) or
attached cache (50 MHz CPU)
• Optional memory expansion module
1.3.1 System Board
The system board, shown in Figure 1–4, contains the following features:
• Slot for CPU module
• Slot for memory expansion module
• 8 EISA slots (6 bus master slots, 2 slave slots)
• On-board VGA with 512K RAM (optional upgrade to 1 MB RAM) and 1024
x 768 resolution
• 4 SIMM sockets (accepts 2, 4, 8, and 16 MB SIMMs for maximum of 64
MB)
• Diskette drive control
• IDE drive control
• 2 9-pin serial ports
• 1 25-pin parallel port
• Keyboard and mouse connections
• VGA monitor connection
Refer to the figure key in Table 1–4.
1–8 System Overview