Buzz #18 11 октября 1999

Железо

PAGE LED - display memory pages to the Speccy.

(C) Father Michael / Delta Corp.


   Hello boys and girls. Today I will tell you about a small
Pribluda (a trifle, and nice and helpful :-) to the Speccy, 
called indicator Paige (pages in the sense ;-}).


   Skip to shemke:


                               / /
2nDD62> 1 - X0 Y0 15 <
5nDD62> 2 - X1 K 155 Y1 14 <Eight LEDs
7nDD62> 3 - X2 (555 ..) Y2 13 (if I have them all

                 ID7 Y3 12 drew, it turned

         4 - Y4 to 11 sucks)

         May 10 Y5

            __ Y6 9560
 GND Y7 6 7 <> +5 B


   Nutrition K155ID7: 8H - land, 16N - +5 V. (DD62 in a 
computer - TM9) 


   In my everything is simple and clear (almost a quote).
But try to explain the working principle of this Labuda. The 
findings 1, 2 and 3 decoder ID7 are connected, respectively, Jr.

(2nDD62), medium (5nDD62) and senior (7nDD62) bits switch
pages. Ie, we get:


               Log Leg decoder

    Conclusions: 1 2 3 Page (number of active output)


             0 0 0 16 15 (Y0)

             0 0 January 17, 1914 (Y1)

             0 1 0 18 13 (Y2)

             0 1 January 19, 1912 (Y3)

             1 0 0 Nov. 20 (Y4)

             1 0 21 January 1910 (Y5)

             1 1 0 Sept. 22 (Y6)

             1 1 1 July 23 (Y7)


   Active one decoder output, which number is set at the 
entrance. Accordingly, glows, and one of eight LEDs. Below

reduced prog demonstrates the capabilities of the gadgets.

; Written on ALASM.

        ORG 25000
PPP LD A, 16

        LD B, 7
LLL

        PUSH BC

        LD BC, # 7FFD

        OUT (C), A

        EI

        DUP 5

        HALT

        EDUP

        DI

        INC A

        POP BC

        DJNZ LLL


        LD B, 7
LLL1

        PUSH BC

        LD BC, # 7FFD

        OUT (C), A

        EI

        DUP 5

        HALT

        EDUP

        DI

        DEC A

        POP BC

        DJNZ LLL1
;

        LD A, # 7F

        IN A, (254)

        BIT 0, A

        JP Z, 23600
;

        JR PPP
; End office prog


   Beautiful, is not it? " In the same makarom can simulate any
"Running lights" ;-). But even then, with the help of this small
improvements can learn which banks banging one or another prog
so stick to the free page and STS ...
________________________________________________________________



   Oh and one more shemka from the same area - LED screens:


                  / / 39

                  <> +5 V
10nDD62> 39 / /

                         >


                             GND

   Briefly the principle of work:
If a 10 foot DD62 low level - the first screen

                            high - the second.

As of today (31/06/1999) all, bye.