GGGG GGG GGG G G GGGG GGGGG GGG
G G G G G G G G G G G G
G G G G GGGG GGGG GGG G GGGG
G G G G G G G G G G G G
G G G G G G G G GGGG G G G
G G GGGG GGG GGGG GG GGG G G GGG
G G G G G G G G G G G GGG G G
G G G GGG G G GGG G GGG G G GGGG
G G G G G G G G G G G G G G G
GGGGG GGGG G G GGGG GG G G G G G G
THE ZX-SPECTRUM 48 & 128 COMPUTERS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
EXTENDED DEVICES AND USER'S MANUAL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) UAЗPRQ/Borisov Serge
продолжение
Основной порт KPS8OBB55A подключается к CHANNEL-6 сле-
дующим образом:
┌───┬─────┬───┐
Шина │D0 │ PPI │A0 │
данных < ███████ >│.. │ │.. │< ███████ > канал A
D0'-D7' │D7 │ │A7│
6 ├───┤ │ │
CHANN.-6 ─────────┤CS │ │B0 │
─ 36│ ─ │ │.. │< ███████ > channel B
WR' ─────────┤WR │ │B7 │
─ 5 │ ─ │ │ │
RD' ─────────┤RD │ │ │
9 ├───┤ │C0 │
A5 ─────────┤A0 │ │.. │< ███████ > channel C
8 │ │ │C7 │
A6 ─────────┤A1 │ │ │
───── ┌──┐ 35├───┤ │ │
RESET' ──┤1 o──▄──┤R │ │ │
└──┘ │ │ │ │ │
К5SSЛН1 └───> RESET'
The main port is connected according to the standard for this device
addresses: #1F - channel A
#3F - channel B
#5F - channel C
#7F - control word register
In addition, because after the initial reset BBSS is installed
to mode "0" and channel A is programmed for input (after receiving
RESET signal), that is, it is possible to use this channel for
KEMPSTON JOYSTICK (standard address - #1F).Device
connects to the 5 least significant bits of port A, the most significant bits must
be grounded, because This is what most programs do
the sign determines that the KEMPSTON interface is connected. True
when accessing the standard ZX-LPRINT printer interface
II-III (read/write by #7B) port is simultaneously selected and
may disrupt its operating mode. Although such operation of devices
the presence of a buffer does not cause SDto mutual conflict on the bus
It is advisable to disable the decoder while printing (OFF Interface)
or provide additional control of the A2 address for the CS port
(check by OR this address, see above). However this
the question can not be considered if ZX-LPRINT is inactive (not
the ENPR input is grounded) or in the program after printing is completed, the port
BBSS is being reconfigured again, at least adding
decryption in this way (the issue with
AY-3-89XX), this problem will cease to exist.
If there is a music coprocessor AY-3-8910(12) decoder
it is also necessary to supplement with a circuit for monitoring high addresses:
AY-3-8912
┌────┬─────┬────┐17
───── 16 │─── │ SSG │ A& ├───┐
RESET' ────────┤RES │ │ │19 o───> +5V
│ │ │BC2 ├───┘
├────┤ ├────┤
28 │ │ │ │14
D0' ────────┤D0 │ │IOO ├──>
27 │ │ │ │13
D1' ────────┤D1 │ │IO1 ├──> PARALLEL PORT
26 │ │ │ │12
D2' ────────┤D2 │ │IO2 ├──>
25 │ │ │ │11 ▄▄▄ ▄▄▄
D3' ────────┤D3 │ │IOЗ ├──> │ │
24 │ │ │ │10 █ 10k █ 10k
D4' ────────┤D4 │ │IOCH├──> █ █
23 │ │ │ │9 │ 5.0 + │
D5' ────────┤D5 │ │IOS ├──> o────o───────┤├──┼─────> L
22 │ │ │ │8 │ │ ┌─────o──┤├─> R
D6' ────────┤D6 │ │IOб ├──> │ │ │ │ 5.0 +
21 │ │ │ │7 █ █ █ █
D7' ────────┤D7 │ │IO7 ├──> █10k █ 20k █ 20k █ 10k S
├────┤ ├────┤5 │ │ │ │ O
15 │ │ │ A ├──────o │ │ │ U
CLK 1.75' ─────┤CLK │ │ │4 │ │ │ │ N
│ │ │ B ├──────┼────o─────o │ D
├────┤ │ │1 └────┐ │ │
18 │ │ │ C ├───────────┼─────┼─────o
┌─────┤BDIR│ ├────┤3 │ │ │
│ 20 │ │ │Ucc ├───> +5V │ │ │
│ ┌───┤BC1 │ │ │6 █ █ █
│ │ │ │ │GND ├───┐ █ 10k █ 10k █ 10k
│ │ └────┴─────┴────┘ ▀▀▀ │ │ │ M
│ └──────────────────────────────┐└─────o─────o──┤├─> O
└───────────────────────────────┐│ │ + N
── ЛАЗ ЛЕ1 ┌───┐ ││ █ 5.0 O
WR' ──────────────────────────────┤1 │ ││ 10k █
┌───┐ ┌───┐ │ о─┘││
A13' ────┤& │ ┌─────┤1 │ ┌──┤ │ │ ▀▀▀
│ o────┘ │ ├───o └───┘ │
A15' ────┤ │ ┌─────┤ │ │ ┌───┐ │
── └───┘ │ └───┘ └──┤1 │ │
#FD ─────────────┘ K5SSLL1 │ o──┘
┌───┐ ┌──┤ │
A14' ───────────────────┤1 │ │ └───┘
── ┌───┐ │ o───┘ K5SSLE1
RD' ────┤& │ ┌─────┤ │
│ o────┘ └───┘
+5V ────┤ │ K5SSLE1
└───┘
K555LAZ
--- --- -- --- ----- - -- - --- - -- - -
V.K. Unfortunately, the story ends here, because... file with
I'm a little beaten by the article. If anyone has this
complete article, please send it, and then, I hope...
to be continued...
AND AGAIN ABOUT ADDITIONAL MEMORY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) I. Zhovtonoga
Almost simultaneously in two publications in 2000: the magazine B_Crow#3 and
newspaperCITY#42switching circuit diagrams were published
additional memory (cache).
Previously, cache schemes were provided inSPECTROFON'e 17and in the Minsk Gas
zete LPRINT13 .
The cache is used in the following programs: Real Com, Quick Com, SPF
and others.
More details about using the cache can be found in the title.
nykh above the media.
Since a statistical chip is used as memory in the cache,
RAM with low power consumption in information storage mode
mation, it turned out to be possible to organize the storage of information
in the cache memory after turning off the computer's power. Apply in
RAM cache with memory less than 16 kB is undesirable, because REAL COM, on-
example, requires 16 kB of memory.
It is quite convenient to use the 62256 chip as RAM,
which capacity is 32 kB. 16 kB can be allocated for cache, and others
16 kB can be used later under DOS or SOS. Scheme Romana
Milukova, published in the magazineB_Crow#3 , built withat-
by changing the 1SSLA2 microcircuit (this microcircuit has outputs with
open collector), and as a source of backup power -
A 3 V battery is used. In the diagram shown on
fig. 1 instead of the element of the LA2 microcircuit there is a transistor VT1, and in
capacitor C1 is used as a backup power source
at 470 microns. With such a capacitor, information is stored in the cache
within 6-8 hours after turning off the computer's power.
Sampling the cache RAM chip ("0" at the /GS input of the chip
62256) occurs at A14="0", A15="0", /MREQ="0" if the trigger
DD2 is in state "1".
The radioelements are those on which it was collected and tested
this diagram. The pinout of the microcircuits used in the circuit is given
in Fig. 2.
Transistor VT1 can be replaced with KTZCh2B, KTZ102EM, etc. Mick-
circuits DD1, DD2 can be of the 1533 or 555 series. Resistors R2-R4
- no more than 1k.
To avoid damaging information in the cache, turn off the power
computer, preferably with the "RESET" button pressed.
I do not have absolutely reliable information about the cipher
62256 chip designations. KMB225bCLP-7 can decrypt-
It goes like this: KM-storage device from SAMSUNG
ELEKTRONICS", 62256-static memory with a capacity of 32 kB, C-version high-
fullness (can also be A or B), L-low consumption (if
this sign is missing, thenhigh if LL-very low pot-
regeneration), P-case DIP, 7-memory speed in tens of nano-
seconds
Literature. "Radioamator" magazine 6'98 Information sheet page 31.
V.K. Figures 1 and 2 are included in the supplement to the newspaper.
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