Letters from readers
(C) Pavel Sokolov
What are Zx'y ...
Part I.
So, you decided to read my article on
leisure time, I hope you like it, so
as there is something for the overall development and
not only ... In it, I give my personal
IMHO on subj'a, as well as IMHO those
who helped me in writing this article.
I do not work (yet) for a single firm,
generating any computer, so my opinion is absolutely neutral
and does not can be regarded as advertising or anti ...
The first computer that I learned was
LENINGRAD 48K, but in general, this whole "saga" with the
production of new models in our the country has started (again,
to my knowledge) in 1988 with "MOSCOW 48K.
MOSCOW 48K
(Moscow, of course)
Year of occurrence - about 1988. This model is the most
complete copy of the "ZXSPECTRUM 48K, RAM collected at eight
565RU5 and eight 565RU6, that is, as in the corporate computer.
The same inhibition of the processor addresses
from 4000N to 8000N (16384-32767), although the organization of
its work was done in sinklerovskom original.
Yes, even in the Moscow-48 "312 lines per frame,
that, as it were a standard. In general,
According to eyewitnesses, it is quite difficult to
adjustment, and on the board a lot of "fixes". In
Therefore, this model was distributed only in Moscow and to St.
Petersburg almost came ...
BALTIC
(Vilnius)
This model was garazdo easier to configure than Moscow, the
circuit easier, the presence of port scheme KR580VV55
significantly enhances the computer. But m / s K556RT4 and
K155RE3 complicated distribution of "the people" of this
machine, and the various "innovations" in the memory with a
frequency 4 cycles MHz is not the best thing you can think of
for ZX-Spectrum.
MOSCOW 128K
(Moscow)
This is the first car with 128KB memory. The circuit has an
interface printer LX-PRINT, Kempston joystick, a full RGB
signal. And the disadvantages, such as "is failing" memory and
difficulty in tuning, not added to her popularity.
LENINGRAD 1
(St. Petersburg, the author - S. Zonov)
This is already very well known and popular
model. Her dignity - Input from the tape on 521SA3 that
provides good quality reading from a tape, as well as simple
scheme did Leningrad 1 "is very popular among the diskless
Speccy. This is not could prevent even a fairly serious
Disadvantages: wrong addressing of ports
and the complexity of any extension.
PENTAGON 48
(The name he received from
pentagonal layout dirt tires)
And it already has a controller BETA-DISK
interface!
"The Pentagon 48K" a little less common (and maybe more) than
the same LENINGRAD 48. " On the one hand, the machine is not
quite correct addressing of ports, faulty memory, lack of
RGB-shaper and lack of on-board system connector, and
on the other - to enter with a tape recorder through K561LN2
chip (CMOS cell), small Revised for the TURBO-mode and, of
course, availability BETA-DISK interface'a.
Then, some time in the markets of Moscow
and St. Petersburg were sold several
New on _tem_ times, types of machines, such as the Lions 48K
"," Kharkov 48 "(with separate fields of memory)," Krasnoyarsk
", and so on, but they are virtually unknown
all for the same reasons: the complexity in setting up /
tuning, the "extra" flash ROM, a small flexibility to empower
the machine and the lack of system connector on the board.
Ending in the next issue.
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