╔═══════════════════╗
║ ║
║ V I D E O P O R T ║
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┌─────────────────────────────────────┐
│ Image input device, │
│ encoded in the video signal, in │
│ ZX-compatible computers, with prog- │
│ frame support. │
└─────────────────────────────────────┘
The idea for the development was drawn from auto-
rum from the publication ZX-REVIEW - 1991
(p. 121), which reported on the
existence of the "Videoface" device from the company
"DATA-SCIP".
Let's open the magazine "ZX-REVIEW":
The article is called "To your note
book."
-----------------------------------------
8.Videoface
Company: DATA-SCIP
Price: £69.00
The device is intended for digitizing
transfer of images. Compatible with microd
rave, as well as disk systems "O-
pus" and "Beta".
Screen digitization time - 0.27 sec. All
software is controlled from
menu. Has the ability to store in memory
6 full screens. Can be used in
for entertainment and professional purposes.
The necessary cords are included.
------------------------------------------
Having no idea about the principles
construction of "Videoface", the author called his
VIDEO PORT device. The name is associated with
because this device plays a role
input port, but not for digital signal,
and for a video signal. VIDEO PORT connect-
connects to the video output of the TV, video camera
measures, video recorder. Device location
in the system is shown in the figure:
┌────────────┐
│ │
│ TV │
│ │
└──────┬─────┘
│
│
┌───────┴──────┐ ┌───────┐
│ │ │ Block │
│ VIDEO PORT ├──┤power supply│
│ │ └───────┘
└───┬──────┬───┘
│ │
│ │
┌───┴──────┴───┐
┌────────┐ │ │
│Disk drive├──┤ ZX-Spectrum │
└────────┘ │ │
└───────┬──────┘
│
│
┌──────┴─────┐
│ │
│ Display │
│ │
└────────────┘
VIDEOPORT is connected to the computer
via a buffered external bus
devices.
Under the control of the program loaded
in ZX, the image frame is copied to RAM
device, then read in ZX-Spectrum,
recoded into screen format and displayed
appears on the display. Full shift cycle
images on the display screen - approx.
onesecond. The resulting image can
can be flushed to disk or tape. Voz-
possible program options for the drive or
tape recorder.
How to use the received images?
Considering that 70% of information is human
receives through the visual input channel
data, then we can assume that you entered
integration into the ZX-Spectrum system of the proposed
devices potentially increases it
power is approximately doubled. This way
Therefore, this device allows the user
mate to receive a copy of the video frame on an e-
wound ZX-Spectrum and save it as
file on disk or tape.
Device Specifications
───────────────────────────────────────
- input impedance via video
input...........................100 Ohm
- input signal amplitude......0.5-1V
- video discredit frequency
signal........................7 MHz
- number of lines stored in RAM..312
- supply voltage............+12 V
+5 V
- current consumption in the circuit +12V...40 mA
along the circuit + 5V...320 mA
- manual installation is possible
contrast and white balance.
- connects to ZX-Spectrum-compatible
computers via buffered bus
Well, external devices.
Software made by
torus, works in the iS-DOS OS environment. Choice
determined this way because iS-DOS -
promising system for ZX-Spectrum -
compatible computers, has in its
composition of the program for printing a picture
nok, programs for packing and unpacking files
catching pictures.
What is the scheme itself?
These are:
- microcircuits - 24 pcs.:
537RU17 - 6 pcs.
555IE10 - 2 pcs.
555TM2 - 2 pcs.
555ID7 - 2 pcs.
555LN1 - 3 pcs.
555LI1 - 3 pcs.
155ИР13 - 1 pc.
555ИР22 - 4 pcs.
174ХА11 - 1 pc.
- transistors KT315 - 3 pcs.
- diodes: KD522 - 9 pcs.
AL307 - 1 pc.
- resistors - 37 pcs.
- capacitors - 42 pcs.
- quartz 14 MHz - 1 pc.
Description of the circuit, circuit diagram and
We already have the software -
xya, soon there will be a printed one
fee. Possibly in the next rooms
Let's talk about how this VIDEO PORT works
It really melts.
The author of the development is Manilov A.P. Moscow
*****************************************
ZX-FORUM 2 "INFORCOM" p.54-78
kiSSSoft 1995
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