Hardware - Serial port for Spectrum

 Serial port for Spectruma.


(C) VIC, 1997, Kharkov, Ukraine


   Description of the modification that will allow you to connect to your
computer any external device designed for after-
dative port. For example - a mouse, modem or printer. Ready
You can order a new port card or software
contact me by calling the number given at the end
articles or by writing to the addresses indicated there. So, prin-
schematic diagram:


        ┌──┬──┬──┐ ┌──┬──┬────┐
 A12>──1┤A0│DC│Q0╞15─────────┐ <─8┤D0│DC│ │ ┌──<+5V
 A13>──2┤A1│ │Q1╞14───┐ │ <─7┤D1│ │ │ │
 A14>──3┤A2│ │Q2╞13 │ │ <─6┤D2│ │ │ │
        │ │ │Q3╞12 │ │ <─5┤D3│ │CLKO├9──┼─┐
        │ │ │Q4╞11 │ │ <─4┤D4│ │G0 ├11─╡ │
  A3>──4╡E1│ │Q5╞10 │ │ <─3┤D5│ │OUTO├10─┼─┼──>FR1
OIRQ>──5╡E2│ │Q6╞9 │ │ <─2┤D6│ ├────┤ │ │
 A15>──6┤E3│D1│Q7╞7 │ │ <─1┤D7│ │CLK1├15─┼─╡
        └──┴──┴──┘ │ │ ├──┤ │G1 ├14─╡ │
                       │ └────21╡CS│ │OUT1├13─┼─┼──>FR2
  D1 - 15ZZID7 │ A8>──19┤A0│ ├────┤ │ │
  D2 - 58OVI5Z │ A9>──20┤A1│ │CLK2├18─┼─╡
  D3 - 58OBB51(UKS1) │ ┌─22╡RD│ │G2├16─╡ │
  D4 - K17OUP2 │ WR>┼─23╡WR│D2│OUT2├17─┼─┼──>FRZ
  D5,D6 - K17OAP2 │ │ └──┴──┴────┘ │ │
                       │ └────────────────────╡ │
1.7SMhz >──────────────┼───╥─────────────────────────
     ...
     -
D0>──┼─27┤D0 │USAPP│ │ │ ║ │ ┌───┬──┬──┐ ║
D1>──┼─28┤D1 │COM2 │ │ │ ║ ╓1─┼─4┤X1 │ │Y1╞13──4╢
D2>──┼──1┤D2 │ │ │ │ ║ ║ ╞─3┤UP1│ ├──┤ ║
D3>──┼──2┤D3 │ │ │ │ ║ ║ │ ├───┤ │Y2╞12──5╢
D4>──┼──5┤D4 │ │ │ │ ║ ╟2─┼─5┤X2 │ ├──┤ ║
D5>──┼──6┤D5 │ │ │ │ ║ ║ ╞─2┤UP2│ │Y3╞11──6╜
D6>──┼──7┤D6 │ │ │ │ ║ ║ │ ├───┤ ├──┤
D7>──┼──8┤D7 │ │ │ │ ║ ╟3─┼─6┤X3 │ │ ├15───<+5V
     │ ├───┤ │ │ │ ║ ║ ╞─1┤UPZ│D4│ ├8──┐
     └─11╡CS │ │RxR├14 │ ║ ║ │ └───┴──┴──┘ ┴
WR>────10╡WR │ │TxR├15 │ ║ ╚══╪═══════════════╗ TXD
RD>────13╡RD │ ├───┤ │ ║ R1║ ┌─╫──────>2
A8>────12┤C/D│ │TxD├19─┼─1╢ 1K║ ┌──┬──┬──┐ │ ║ RXD
         ├───┤ │RTS╞23─┼─3╫1───┼─2┤X1│ │ │ │ ╟1─────<3
FR1 ┌──25┤RxC│ │DTR╞24─┼─2╢ │ ├──┤ │Y1╞7┘ ║ RTS
>───╨───9┤TxC│ ├───┤ │ ║ ╞─1┤C │D5│ │ ┌─╫──────<4
         ├───┤ │RxD├3──┼─4╢ │ └──┴──┴──┘ │ ║ CTS┌───21┤RES│ │CTS╞17─┼─6╢ │ ┌──┬──┬──┐ │ ╟3─────<5
   │ ┌─20┤CLK│ DDЗ │DSR╞22─┼─5╫2───┼─2┤X1│ │Y1╞7┘ ║ DCD
   │ │ └───┴─────┴───┘ │ ║ │ ├──┤ │ │ ╙2─────<8
   │ └─────────────────────┘ ║ └─1┤C │ ├──┤ SG
   ┴ ║ ├──┤ │Y2╞6─┐ ┌─────>7
                              ╙3─────3┤X2│D6│ │ │ ┴ DTR
                                      └──┴──┴──┘ └──────>20
 pin 4 D5 and D6 connect to GND
 Pin 5 D5 and D6 connect to -12V
 Pin 8 D5 and D6 connect to +12V



        Controller port addresses:


      #80F7, #81F7, #82F7, #83F7 - timer ports
      #90F7, #91F7 - COM1 interface ports

   When working with a port, you must first program
timer for frequency division mode (mode 3). In this case, it is necessary
It is important to ensure that the resulting frequency does not exceed
limits of permissible values (maximum frequency at inputs
RxC/TxC USART according to the passport is 615 KHz).

   The type of connector used is DB-25P (standard connector
external modem). For those who don't know, DB-25P stands for
connector type "plug" or "male".

   To connect COM2 you need to use 3 chips
(BBS1, UP2, AP2). USART must be applied to inputs 9 and 25
instead of signal FR1, signal FR2 from the timer, and input 11 signal
from pin 13 ID7. For TxD signal you need to use
freehalf D5.

   For more information please contact directly
to me.


┌───────────────────────────── ─────────────────────────────┐
│ (c) Vic at 10.29.96 │
│ Phone: (0572) 10-50-26 │
└───────────────────────────── ─────────────────────────────┘