City #30 25 сентября 1999

Железо

Iron - hardware clock scheme for ZX spectrum.

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



         HARDWARE CLOCK FOR ZX SPECTRUM

(C) Mr.Gluk
(C) V. Kazakov


  Bring to your attention on the chip circuit clock KR512VI1 
developed Mr.Gluk 'th, and has kindly given me VEL'om / PXM / 
CTL. 

  Since the description of the scheme is somewhat Gluk'om
chaotic nature, I took the liberty of some to reduce and 
recycle all of the text. Also, I felt it necessary to publish a 
small revision of the scheme to supply hours of FE computer at 
a time when it is enabled. I hope that the author hours scheme 
will not be on me in the offense. 

  Revised scheme taken from RADIOEZHEGODNIKA 1989

  Full text of the description of copyright work hours
You can buy a newspaper.

  So now the scheme.

                                    - +

                          4-6B

                        battery

  10p

     o X o January 1924

       32768Hz 22M 10k

        ZQ o February 1923 X

 o o o o March 22

  20p 470k

              / D0 April 21 X


             By May 1920 D1 o


                 D2 June 19 X

             w

                 D3 July 1918

             and

                 D4 August 1917

             n

                 D5 September 1916 X

             e

                 D6 October 1915


                D7 11 KR512 14

                                 VI1

                           December 1913



        LL1

A3 1 o (c) Mr.Gluk
/ IORQ



            LE1

                            DS

       o 1 o
A13

                            AS

            1 o
A14

                                    TM8

            LE1 D7

                                   D0 / Q0o

/ WR o Jan. 1 C
A12 / RES

                                   D

       LL1 LL1


  DD1 - 555LE1, DD2 - 555LL1 as DD3 better
555TM8 use, but you can TM2.

  After assembling the circuit there unpleasant phenomenon -
# FFFC is an even address, and avoid dryganiya curbs should be 
put lock sampling port # FE at sample # FFFC. 

  Accuracy can be adjusted, you need to do
instead of one of the capacitors supply podstroechnik.

  Access to the hours performed by setting the 7-th bit port # 
FFFC, otherwise - in port space companies do not have hours. 

  After the installation of above-mentioned bit to 1, you can 
access to the ports of chips: - # EFF7 - register Data, # DFF7 
- address register. 

  In the address register stores the address of the necessary
cell in the data register is written data
record set in cell m / s, as well as the data is read from the 
selected cell. 

  Now that it represents m / sec. For
Programmer - a device with 64 presets, some of which are 
occupied by official registers. 

  Address

  # 00 - seconds

  # 01 - second clock

  # 02 - minutes

  # 03 - minute alarm

  # 04 - Hours

  # 05 - Alarm Clock

  # 06 - the day of the week

  # 07 - the number of

  # 08 - month

  # 09 - the last two digits of the year

  # 0A - business case

  # 0B - the same

  # 0C - the same

  # 0D - the same

  # 0E here until the end (# 3F) - RAM user.


  And now the scheme is finalized.

                                  VD1 +4-6 B

                                    <> Battery

                         24 VD2 +5 B complex

                                o <o>

     2 KR512VI1 23

                                  R1 R2

     March 22 220k 10k

                                o

     April 1921

                                  VD1, VD3

     May 20 KD522A


     June 1919 VD2

                                    D9B

     July 1918 VD3

                            o o>


                          C1 C2
 (C) V. Kazakov 4700 4700



  To date, the hardware clock uses
Once the new firmware ROM Mr.Gluk 'and "MR GLUK RESET
SERVICE v5.1 "(for the Pentagon?), But CMOS Commander
v 0.8, which are available in the newspaper.

  Although it may be something else and has been written ...