Turbo 2+ — ZXNet «zx.spectrum»

From Maxim Polyanskiy To All 18 April 1997

Hello, Pavel!

Сpд Апp 16 1997, Fedin Pavel писал к Maxim Polyanskiy по поводу "Turbo 2+."
MP>> Это было на очень старых платах (где опрос PC/XT клавиатуры висел
MP>> на RST #66)

FP> Что за RST #66???????????????????
Hу по русски - это NMI.
FP> [Skip]

MP>> Кидай! Может чего интересного будет. А вообще хороший компьютер.
MP>> Только немножко не доделанный :) У меня к нему до сих пор
MP>> прицеплен программатор и эмулятор пзу.

FP> ЧЕГО??????? ЭМУЛЯТОР ПЗУ!!!!!!!!! А можно описание, схему... А то на
FP> Профи собрать такую фичу хочу для отладки ОС в реальных условиях.
Если для отладки ОС нужно - сейчас придумаю попроще.
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section 1 of 1 of file SPECY_RO.ZIP < UUCODE 2.06 by DISMEMBER >

filetime 579996736
begin 644 SPECY_RO.ZIP

-``$`.@```%T%````````
`
end
sum -r/size 53415/2035 section (from "begin" to "end")
sum -r/size 415/1453 entire input file

====================================================
Вот, вроде придумал. :) Подобный девайс год назад собирал мой знакомый
работал он на ура. Мы за полминуты фонты в Бейсике меняли ради прикола.
FP> пока, со всяческими Wishes'ами, Fedin Pavel!
Bye! Приятно было пообщатся Pavel!

... Жизнь не так проста, как кажется. Она намного проще !

From Fedin Pavel To All 21 April 1997

MP> Well, in Russian it’s NMI.

I see...

MP> If you need it for debugging the OS, now I’ll come up with a simpler one.

[skipped]

Is there a mikruhi 62512 similar to the ROM? It will be a little easier this way. I decided to rework the scheme a little and improve it. I don't want to install an extra inverter. :-)

P.S. As far as I understand, 62256 is SRAM. But won't it be expensive? And
more. I would like to have the pin of this little thing. Because I’m still
far from a professional in hardware - this will be my first development.

From Michael Markowsky To All 22 April 1997

Hello, Fedin!

Mon 20:30 21 Apr 1997 Fedin Pavel writes to Maxim Polyanskiy:

FP> P.S. As far as I understand, 62256 is SRAM. But won't it
FP> cost a lot? And one more thing. I would like to have the pinout of this little thing.

It differs from 27256 only in the location of A14 and the presence of a recording
enable signal (legs 1 and 27):

62256
┌────╖ ┌────╖
A14 │ 1 ╙──┘ 28 ║ Vcc
A12 │ 2 27 ║ -WE
A7 │ 3 26 ║ A13
A6 │ 4 25 ║ A8
A5 │ 5 24 ║ A9
A4 │ 6 23 ║ A11
A3 │ 7 22 ║ -OE
A2 │ 8 21 ║ A10
A1 │ 9 20 ║ -CS
A0 │ 10 19 ║ D7
D0 │ 11 18 ║ D6
D1 │ 12 17 ║ D5
D2 │ 13 16 ║ D4
GND │ 14 15 ║ D3
╘════════════╝

Best wishes! Michael KLUG

From George Shepelev To All 22 April 1997

What, exactly, is the problem? The ROM hardware is so easy to maintain that there shouldn't be any difficulties. Add statics to parallel and
port for switching. Well, write software, of course ;)

George

From Maxim Polyanskiy To All 23 April 1997

The last time I bought them in Mitino for 12 thousand. You can take the old three-ruble note out of the cache
.
FP> And one more thing. I would like to have the pin-socket of this little gadget.
Like Comod. I already threw it.
FP> Because I’m still far from a professional in hardware - this will be my first
FP> development.

From Sergej Borisow To All 24 April 1997

╘════════════ў
FP> hardware is still far from a professional - this is my first development
FP> will be.
We did approximately the same design on Pentagon-128 about a year ago, although the device was switched programmatically via the port. It was possible, through
him, even from Isdos, to attach some kind of driver and connect these additional 16K to the RAM disk. The same was done to replace the main ROM
(they wanted to shove STS into it later...).

I used 84256 (there are also 43256) which are generally the same type of static
RAM chips, capable of storing information with the battery until it self-discharges (in
in practice, when used capacitor at 330.0 uF - storage time is about 2-3 days), although this requires some modification of the circuit (you can
look at the AOH on the Z80). They all have the same legs.

From Maxim Polyanskiy To All 29 April 1997

Hello, Fedin!

Thu Aug 31, 1995, Fedin Pavel wrote to Michael Markowsky about "Turbo 2+."
MM>> It differs from 27256 only in the location of A14 and the presence of a signal
MM>> recording resolution (legs 1 and 27):
[...]
FP> Thanx! Is there a 62512?
In a package with 32 pins.
FP> And one more thing. To read from it, you need to submit 1 for CS and OE
FP>. Right? How about writing it down properly? CS, WE, and also OE? Or is OE not
FP> necessary?
Read - /CS=0 /OE=0 WE=1
Write - /CS=0 /OE=1 WE=0