IBM Personal System/2 50 User Manual

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The
following
figure
describes
the
Type
2
system
board
performance.
The
Type
2
system
board
supports
two
speeds
of
system
board
memory.
Cycle
times
differ
depending
upon
the
speed.
See
Figure 3-7 on page 3-11.
“Nis the number of transfers in the burst.
Number Cycle
Device
of
Waits
Time
(ns)
Microprocessor (10 MHz — 100 ns Clock):
Access to System Board RAM:
85-ns
Memory
0
200
120-ns
Memory
1
300
Access
to
System
Board
ROM
1
300
Access to Channel:
Default Transfer Cycle:
VO
Access
1
300
Memory
Access
0
200
Synchronous
Extended
Transfer
Cycte
1
300
Refresh
Rate
500
(min)
(Typically performed every 15.1 ys)
Bus
Master
Access
to
System
Board
RAM
300
(min)
DMA Controller (10 MHz — 100 ns Clock):
Single
Transfer:
300
+
I/O
Access
+
Memory
Access
Burst
Transfers:
300
+
(I/O
Access
+
Memory
Access)N*
System Board Memory Access
85-ns
Memory
200
120-ns
Memory
300
Default Transfer Cycle:
1/0
Access
300
Memory
Access
200
Synchronous
Extended
Transfer
Cycle
300
Figure
1-6.
Performance
Specifications
—
Type
2
System
Board
1-8
Model
50
System
Overview
—
October
1990

IBM Personal System/2 50 Specifications

General

Brand	IBM
Model	Personal System/2 50
Category	Desktop
Language	English