City #31 01 октября 1999

Железо

Iron - scheme Papallelnogo to port on KP580VV55A.

   ************ ********* PLANET SHELEZYAKA



        Parallel on KR580VV55A

(C) Alfa Studio
(C) V. Kazakov


  Today I'll introduce you to the remarkable development of 
Alfa Studio, which was once published in the Belarusian 
newspaper ECHO # 5. Unfortunately, CD with this great 
newspaper, I ruined, having had only redraw the circuit, so 
talk about the finalization of myself as I can. 

  A few words about the chip KR580VV55A. VV55A
is a device for parallel transmission of information between 
the microprocessor and peripheral devices, and contains three 
8-bit channel I / O A, B, C. Channel C can be represented in 
the form of two 4-bit input / output channels to which access 
is made as to the individual independent channels. Peripherals 
are connected to channels A, B, C, and the connection to the 
microprocessor by using the data bus through data buffer.


  In the Spectrum with a device that collected on
KR580VV55A chip can be easily solved problems connecting the 
printer, Kempston joystick, video port, Programmer, and many 
other devices. 

  In order to collect the proposed scheme, you
except VV55A, need two circuits - the inverter, for example 
555LN1 and decoder 555ID4. VV55A desirable to put on the 
socket. Between the legs 555 chipset series, which fed the 
voltage power needed to solder one capacitor 0.033

- 0.33 microfarads.

  All signals are fed to the scheme, if you do not
system connector, taken from the findings of the 
microprocessor. On the scheme after the name of the signals in 
parentheses are the numbers legs Z80, corresponding to these 
signals. In this case, pripaivaya guides to the processor, you 
should be very careful not to burn him.


  In conclusion, I want to give information about the addresses 
used by chip VV55A channels in this scheme: 

  A - # 1F

  B - # 3F

  C - # 5F

  RUS - # 7F.

                                +5 V

                                  26

                / 34 4

  To the data bus D0 IOP A0

     Z80. . 3,2,1,

                     27. . 40,39,38,

                         D7. 37

                     9 A7

  A5 (35) A0 18

                      8 B0

  A6 (1936) A1. .

                     35. .

  RES (1926) o RES. 25

                     36 B7

                        o / WR 14

                      5 C0

                        o / RD. 15,16,17,

                      6. 13,12,11

              DOS o / CS KR580. 10

                               VV55A C7


                                   7



             1
/ IORQ o E1 DC D0
 (20) 2
/ WR (22) E2 00

            June 13
A0 (1930) D1 01

             3
A7 (1937) D2 02

            15
/ RD (1921) G1 03

            14
/ IORQ (20) G2 D1


                           10

                              10

                           11


                           12 (c) Alfa Studio

                    K555

                    ID4 1913


PS. By the way, my Scorpio this thing, and indeed the previous 
one, collected by several other scheme, for some reason does 
not work ...