Epson PX-8 - Chapter 5 The System Interface; 5.1 The CP;M Configuration

REV.-A
Fig. 2-87 shows actual waveforms of the two FR signals.
(Top)
J5, A (lC 2a Pin 10) r-----------------...,
(Bottom) J5, B (lC 7c Pin 63)
5V >5mS
G- ...... I.....----......I..--_ ..... __ _
5V
Fig. 2-87 FR Signal Waveforms
The proper FR signal should be selected by jumper J5, according to the nature of the liquid crystal
display panel.
If the jumper is improperly wired or not wired at all, vertical or horizontal ghost
linesmay appear on the screen.
Select either signal A or B, observing which gives less ghost and better display quality.
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