Hardware; Cpu; Bus Architecture; Chapter 1: Product Information - HP 330 Service Information Manual

Hardware
CPU - MC68020
Both models are an extension of the Series 300 family. Through use of the MC68020 at 16 MHZ
(Model 330) and 25 MHz (Model 350), high-end performance of the Series 300 family is almost
doubled and provides state-of-the-art technology.
Bus Architecture
A 16-bit I/O bus provides interfacing to most Series 200 and 300 accessory cards. This bus is
called the DIO bus.
To increase speed, a new 32-bit I/O bus is used in this computer for even higher performance.
This bus is called the DIO-II bus and provides 6 Mbyte/sec transfer rates, handling even the
highest-performance peripherals independently of processor access to main memory. It is com-
patible with the 16-bit DIO bus of the Series 200 and the Model 310 and 320 computers, allowing
access to most accessory and interface cards available for those systems.
Model 350 memory boards are accessed by a third, very-high speed :32-bit system bus. Con-
necting between the processor board and RAM boards, it allows faster read and write cycles
than the I/O busses would permit.
Figure 1-8 is a diagram of the I/O architecture for the Model 330 and 350 computers.
16 bit
Built-in I/O:
LAN. HI SPD HP-IB.
32 bit
PROCESSOR
32 bit
HP-HIL. RS-232C.
CACHE
HP-IB. AUDIO
MMU
16/32 bit
(/)
Built-in DMA
:::::>
m
T
0
16 bit
010 INTERFACES
C
32 bit
RAM
32 bit
010
II
INTERFACES
16 bit VIDEO BOARDS AND
or 32 bit
GRAPHICS INTERFACES
Figure 1-3. Model 330/350 Computer I/O Architecture
Product Information
5