Specifications

ELECTRICAL SPECIFICATIONS
-----------------.-.---~
Parameter
Master clock frequency
Zao8 clock frequency
Z80B T-state period
E-clock frequency
Write-precompensation:
8-inch drives
5.25
inch drives
HorizontaL
sync frequency
Horizontal
sync period
60Hz modeLs
23.86176
5.96544
167.63223
1.49136
125
250
15.540
64.35
H-sync puLse-width 21.45
HorizontaL sync poLarity positive
V-sync pulse-width 187.7
Vertical
sync poLarity negative
Length of Video data 53.6
Percentage line utiLization 83.3
Video output ampLitude 4.0
H-sync output ampLitude 4.0
V-sync output ampLitude 4.0
H-sync pulse width 8.0
Front porch (data to start H-sync) 1.8
Back porch (end H-sync to data) 0.7
Composite video ampLitude 1.0
Composite sync leveL reLative -0.5
to black LeveL
MegateL Computer Technologies Toronto, Canada
--- ---_.
50Hz models
units
24.80000
MHz
6.20000 MHz
161.29032
ns
1.55000 MHz
125
ns
250
ns
16.150 kHz
61.92 us
20.64 us
positive
180.6 us
negative
51.6
us
83.3
%
4.0
Vp-p:l:3d8
4.0
Vp-p:l:3dB
4.0
Vp-p:l:3dB
8.0 us
1.8 us
0.7
us
1.0
Vp-p:l:3dB
-0.5 V
Appendix
Page A-1