The System Manual of SOL-20 - History of Computers

PROCESSOR TECHNOLOGY CORPORATION
Sol-PC SINGLE BOARD TERMINAL COMPUTER TM
SECTION III
CHECK POINT SIGNAL WAVEFORM
14.3 MHz square wave. (This is not a
( ) U77, Oscillator perfect square wave. It in fact more
Pin 7 Output resembles a poor sine wave.)
4V
( ) U91, Clock 70
Pin 6 Divider ns 430 ns
Output
Gnd
4V
( ) U91, Clock
Pin 11 Divider 270 ns 230 ns
Output
Gnd
12V
( ) U104, CPU
Pin 7 Clock 70 430 ns
01 ns
Gnd
12V
( ) U104, CPU
Pin5 Clock 270 ns 230 ns
02
Gnd
Figure 3—2. Clock circuit waveforms.
111—15