█████████▓▓▓▓▓▒▒░░A drop of solder░░▒▒▓▓▓▓▓█████████
Today we will talk about the board
RAM expansion up to 128kb with music
coprocessor 8910 (8912), it is designed for
computers: Baltic, Leningrad, Pentagon, Byte and
etc.
BALTIC, LENINGRAD, PENTAGON (and others with one
memory field i.e. 8 RAM chips): For
RAM expansion requires 8 KP5bSRUSB chips,
B, D. They are soldered on top of the installed RAM,
except for the 15th pins, which move up and
connect together. In the future, the lower mikruhi
We will call 0 the RAM line. Before
connecting the expansion board, on the board
computer, you need to cut the connection tracks.
conclusions of the following mikruh:
Baltic:
03 output. D13 5SSЛПС and 015 pin. 0 lines of RAM
04 output. Z80 and 011 pin. D18 5SSKP12
05 output. Z80 and 05 pin. D18 5SSKP12
03 output. D18 5SSКP12 and housing
05 output. D13 5SSLPS cut from the body and
connect to +5V.
Leningrad:
011 pin D13 5SSLI1 and 15 pins. 0 lines of RAM
04 vyv. Z80 and 010 pin. D16 5SSKP11
05 vyv. Z80 and 013 pin. D16 5SSKP11
013 vyv. D17 5SSКP11 and housing
Pentagon:
08 vyv. D6 5SSTM2 and 15 pins. 0 lines of RAM
04 vyv. Z80 and 012 pin. D23 5SSKP12
05 vyv. Z80 and 04 pin. D23 5SSKP12
06 vyv. D23 5SSКP12 and housing.
┌─────────────────────────────────┐
│ 026┌────────┐ │
│ A13 ───┤ A13 │ │
││ │ │
│ 027│ │ │
│ to ROMCS (BC1) ───┤ A14 │ │
│ │ │ │
│ 01│ │ │
│to ROMCS (control) ───┤ A15 │ │
│ │ │ │
│ 020 (Len),022 (Bal)│ │ │
│ ┌──┤ CS │ │
│ ─┴─ │ │ │
│ │ 27512 │ │
│ └────────┘ │
│ 128Kb │
│ +5V ┌── 48K(1A) │
│ ────────────┘ ─────────────── │
│ S1 48Kb to BC1 board │
└─────────────────────────────────┘
You can connect an expansion card (EP) either
leaving the old ROMs with BASIC 48K firmware, then when
When the power is turned on, the computer operates in
0128K, you can switch to 048K mode using
switch S01 (see above in the figure.) or
command OUT 32765.32. If there is a controller
TR/DOS drive; no modification is required.
If desired, install ROM 27512 (diagram
ROM connections are given above.) necessary
modify the drive controller:
Controller S-48: a) pin 012. 15ZZTM2
(located under quartz) off. from the body and
connect to +5V. b) cut the jumper connection.
011 and 012 vyv. 15ZZLA2 and 012 vyv. connect to
ROMCS expansion board BCO1.
Controller C02: a) install a jumper between
two contacts (near pin 01 15ЗЗЛЛ1).
b)connect signal LA2 (19V) from controller C2
to ROMCS(13V) expansion board BC1. Everyone else
make connections according to the table
given below. Length of connecting conductors
should not exceed 2 Osm. "Common" and +5V
perform with a cross-section of at least 0.Zmm. Every little thing
Shunt the RAM via ceramic power supply
capacitors 0.15-0.47 (uF).
The menu shown below will appear if
installation of ROM with BASIC-128 firmware.
┌───────────────────┐
│ Tape loader │
│ Basic 128 │
│ Calculator │
│ Basic 48 │
│ TR-DOS │
└───────────────────┘
Note: a) ROM 27512 is installed on
any place on the computer. Connectable pins
026,027,01,022(Baltic),020(Leningrad) before
by connecting they are freed from all connections.
b) the ROMCS(13V) signal is switched on only if
installation of ROM 27512 (27256 for "BYTE") with
firmware BASIC-128.
Computer BYTE:(and others with 02 memory fields
i.e. 16 RAM chips, for example "SANTAKA")
a) If you have installed D51-D60 KR5bSRUSD1, D2
(halves), then they need to be bitten out and replaced
on KR5bSRUSB, V, G.
b) RAM D43-D50 KR5b5RUb bite into them
place to solder KR5bSRUSB, V, G, and the 9th
do not solder the leads, but lift them up and connect them
together and connect to the 9th pin of D41 (15ЗЗКП12).
Half of this little thing is free, so
let's use it.015th output to the body, 013th
pin to +5V, the remaining pins of this microcircuit
connect according to the table.
c) Feed and raise the conclusions of the following
microcircuits: 013 and 014 D56 (15ЗЗКП11);
08 D15(15ZZLL1); 02 D21(15ЗЗЛИ1). All raised
Connect the pins according to the table.
When saving old ROMs with firmware
BASIC-48, modification of the TR-DOS drive controller
(if any) is not required.
Installing ROM with BASIC-128 firmware:
!Installation for those interested!
a) Unsolder both ROMs and install D27 in place
panel.
b) Bite off resistors R046,047,048 (located
to the right of D68 VI5Z).
c) Remove jumper 04-05 and install 05-06.
d) apply the 27th pins of ROM 27256 to ROMCS (13V)
expansion boards ВСО1.
e) Unsolder pin 014 D66(55bRT5) from the board and
lift up without connecting anywhere.
If you have a drive controller "B-48" (or "BYTE
+1994 MINSK), then you will have to modify it:
a) Jumper capacitor C01 47uF.
b) Remove the jumper connection. conclusions 04 and 05
microcircuit 15ZZLA2 and apply ROMCS to the 04th pin
(13V) from the BCO1 board, for this you can
take advantage of free system contacts
connector, for example C07.
If you purchased a "B-128" controller with ROM 27512
with BASIC128+TRDOS firmware, then its modification is not
required. In the computer, bite off resistors R46,
047, 48 and the ROMCS signal (13V) from the BC1 board
C07 connector"BYTE."
The transition to 048kb mode is carried out
similarly with other computers (see table).
┌─────────┬───────────── ───────────────────────┐
│BC1 BOARD│ COMPUTERS │
├───┬─────┼────────┬──── ────┬─────────┬────────┤
│ N │SIGN.│BALTIC │LENINGR.│PENTAGON │ BYT │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│1A │ 48K │ │ │ │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│2A │CASO │ 15th pin. 5b5RU5 0 line of RAM │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│3A │AD1 │02v D26 │015v D26│08v D8 │08v D15 │
│ │ │1SSPE1 │5SSКП11 │5SSTM2 │15ЗЗЛЛ1 │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│4A │A14 │4v Z80 │4v Z80 │4v Z80 │4v Z80 │
│ │ │ │ │ │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│5A │+5V │+5V │+5V │+5V │+5V │
│ │ │ │ │ │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│6A │D4 │7v Z80 │7v Z80 │7v Z80 │7v Z80 │
│ │ │ │ │ │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│7A │A0 │30V Z80 │30V Z80 │30V Z80 │30V Z80 │
│ │ │ │ │ │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│8A │A15 │5v Z80 │5v Z80 │5v Z80 │5v Z80 │
│ │ │ │ │ │ │...
│9A │WR │22в Z80 │22в Z80 │22в Z80 │22в Z80 │
│ │ │ │ │ │ │
...
│10A│A1 │31в Z80 │31в Z80 │31в Z80 │31в Z80 │
│ │ │ │ │ │ │
...
│11A│IORQ │20в Z80 │20в Z80 │20в Z80 │20в Z80 │
│ │ │ │ │ │ │
...
│12A│M1 │27в Z80 │27в Z80 │27в Z80 │27в Z80 │
│ │ │ │ │ │ │
...
│13A│RESET│31в Z80 │31в Z80 │31в Z80 │31в Z80 │
│ │ │ │ │ │ │
...
│14A│ОБЩ. │ОБЩИЙ │ОБЩИЙ │ОБЩИЙ │ОБЩИЙ │
│ │ │ │ │ │ │
...
│15A│ОБЩ. │ОБЩИЙ │ОБЩИЙ │ОБЩИЙ │ОБЩИЙ │
│ │ │ │ │ │ │
...
│16A│УНЧ1 │Подключить к СТЕРЕО усилителю 5OOMb,│
│ │ │ │
├───┼─────┼ │
│17A│УНЧ2 │ для МОНО join together. │
│ │ │ │
...
│1B │CAS │6в D25 │11в D13│8в D6 │ │
│ │ │5SSLPS │5SSLI1 │5SSTM2 │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│2B │CAS1 │15th pins 5b5RU5 -1 lines│ │
│ │ │ka RAM │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│3B │A14 │11v D17 │10v D16 │12v D23 │14v D56 │
│ │(1) │5SSKP12 │5SSKP11 │5SSKP12 │15ZZKP11│
│ │ │ │ │ │11v D41 │
│ │ │ │ │ │15ЗЗКП12│
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│4B │CAS1 │ │ │ │2в D21 │
│ │(BT) │ │ │ │15ZZLI1 │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│5B │A15 │5v D17 │13v D16 │4v D23 │13v D56 │
│ │(1) │5SSKP12 │5SSKP11 │SSKP12 │15ZZKP11│
│ │ │ │ │ │10V D41 │
│ │ │ │ │ │15ЗЗКП12│
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│6B │CLK │12v D26 │2v D3 │11v D10 │2v D26 │
│ │ │155RES │5SSUE7 │5SSUES │15ZLACH │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│7B │S.EKR│3v D17 │13v D17 │6v D23 │12v D41 │
│ │ │5SSKP12 │5SSKP11 │5SSKP12 │15ZZKP12│
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│8B │D0 │14v Z80 │14v Z80 │14v Z80 │14v Z80 │
│ │ │ │ │ │ │
├───┼─────┼────────┼──── ────┼─────────┼────────┤
│9B │D5 │9v Z80 │9v Z80 │9v Z80 │9v Z80 │
│ ││ │ │ │ │
...
│10B│D3 │8в Z80 │8в Z80 │8в Z80 │8в Z80 │
│ │ │ │ │ │ │
...
│11B│D2 │12в Z80 │12в Z80 │12в Z80 │12в Z80 │
│ │ │ │ │ │ │
...
│12B│D1 │15в Z80 │15в Z80 │15в Z80 │15в Z80 │
│ │ │ │ │ │ │
...
│13B│ROMCS│27(27512│27(27512│27(27512)│27(27256│
│ │ │ │ │ │ │
...
│15B│D6 │10в Z80 │10в Z80 │10в Z80 │10в Z80 │
│ │ │ │ │ │ │
...
│16B│D7 │13в Z80 │13в Z80 │13в Z80 │13в Z80 │
│ │ │ │ │ │ │
...
│17B│CASO │ │ │ │15в D60 │
│ │(БТ) │ │ │ │5б5РУ5 │
...
Share your thoughts about the article