Sinhroselektor and other EGA-shnosti
TDD
Hi everyone! Somehow in the case of acquired
I fee Pentagon 1024SL v2.2, a replacement
his old one Scorpion'u. Nabalovav
shis with PAL TV encoder and a (stupid
telly did not want to understand the RGB), I decided
connect it to the EGA monitor, the more
Scorp that worked with him. And here is to
chalos most interesting! Well, with quenching
"Light black" I quickly figured out types
toriv appropriate schema from the old to
MPa, but with the timing had to rotation
zitsya.Na board Pentagon'a no pa
zdelnye lowercase and human sinhroimpul
raw. As the author says, simply was not
free leg in the FPGA.
I tried to give sinhrosmes
line and human resource inputs monitor inversion
preted it in different promptness, nothing
helped. Then I decided to put the selector
clock on K174HA11 as a television
zorah, and since it transmits signals to the monitor
torus. Quest finished SPM module not uvencha
were a success, I just bought mikruhu and grew
rash Radioprofi, painted and mordant
fee, and collected by this module. But as I
nor fought with him, twisting, turning all podstroech
nicks on it, as well as the frame rate of row
on the monitor, I never managed to get
its ok to show it. Framerate
module gave a clear, but the lower-case does
did not want to synchronize. Maximum, which
I was able to achieve, adjusting the frequency of
lines - is that the image does not "run
lo ", and the relative standing on the ground, trying to
wrap to the left, then right. Neither of which
stability we did not go. And now, after not
How many hours of "catching-micron," I axi
Nilo poked oscillations in sinhrosmes and
see what is actually there ...
And where I used to be? Not surprisingly, the
He did not catch sync! First, the signal
formulas were mixed by XOR, because
This is likely strayed blue line
hronizator.
Ed.: In the original Pentagon same ca
moe.Chasche most evident in the fact that the top
of a few lines of Border are "crooked."
Secondly, and most importantly. Duration row
chnyh clock was only about
2.4 microseconds, while the specification
on the TV signal must be at least 12.10
mikrosekund.Ne surprising that he was not caught
synchro, wonder how it caught the telly with PAL
coder. Then I decided myself to come up with a scheme
sinhroselektora, which would have lengthened and
line clock. After extended
GOVERNMENTAL thought was painted scheme which
pevraschaet all the disadvantages into advantages, and
in this surprisingly simple.
* Capacitor 1.5 nF regulates romance
lnost SSI, you can pick up.
The principle is simple: The RS-trigger, RC-circuit and
Schmitt trigger implemented "extension"
lowercase impulsov.Na D-flip-flop - the element
comparison with the use of an elongated clock
gressorial. If the initial pulse is shorter - no
Why not take, and if longer - that
"Overturn" the input element
"XOR". Naturally, longer
is the vertical sync signal,
a signal to the coup - Personnel. Further, on
junction transistor is made of current and
resistors - to agree on the level of C
drove. Oh, and good old tradition of pi
tanie +5 volts at mikruhi served on the 14 th
conclusion, and the total supplied to the 7-th output.
Surprisingly, the assembled module earned
immediately, it took me just pick up
capacity in the chain extender. At this time I
too lazy to draw a charge, and assembled module
free-field mounting board companies.
EGA-connector pinout: 1-generic, 3-R,
4-G, 5-B, 6-Bright, 8-FID, 9-IAC, the remaining
nye will not connect.
