City #21 24 июля 1999

Iron - Finalization Pentagon'a to work with disks of high density HD.

          Saransk. Republic of Mordovia

 Free computer magazine for ZX SPECTRUM

         (Hm. .. Free? And do not expect)



                # 21 of 25.07.99g



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                 PLANET SHELEZYAKA
--------------------------------------------------
(C) V. Kazakov


  Today I bring to your attention an article from one of the 
best, in my opinion, computer magazines DEJA VU # 7 on 
finalizing PENTAGONa. 

(C) AXLR

           Refinement Pentagon'a for

             with high-density disks


    So, what should I do to normal
controller has earned a high-density disks?
If your computer has already installed the turbo mode, then
all the improvements takes literally an hour, and if not,
Well - there are already proposed a modified scheme
turbo for the Pentagon - collect.

    So, even if the turbine you already have, it
have a bit to finish. Actually, Revised
here are two: one to activate the turbo when it works
DOS, the other forms / wait for treatment
processor to the ports.

    On the latter should say especially. It is noticed that
some instances KR1818VG93 namely, 1993 and
later model year, do not work in
Turbo. The quality of exchange with the disk is like and
no effect (not specifically tested), but who is it
VGshku knows.

    It is best to lead a full turbo scheme
for the Pentagon, but with modifications:

                * 100pF

            LA3 TM2

                 ===
 D3: 2 '° 13 ° R
 D3: March 12 D _

                        11 / C Q ° 8> D5: 2
 D10: December 10 ° S
 D15: 5

                      +5 V
free elements TM2 and LA3 can be found on board
com

                                      DD1 +5 B

D45: March 2 A0 K47

                            +5 V 5 A1

                                        Y0 4> Z80: 6
D2: September 3 B0 K10

                                   B1 Y1 6 7>

                                           Z80: 24

                +5 DD3.1 1 S

                                  15 ° OE

                   1 ° R

                   2 D _

                   3 / C Q ° 6

                   4 ° S



          DD4.2

 / Bit7 # FF 4 1 6
 D76: May 9


      +5 DD5.1 ​​DD4.3 "NORMAL"

                                     S1
 HLD 1 ° R _ 13 January 1911

         2 D Q ° June 1912
 / IP 3 / C

         4 ° S DD6.1 "TURBO"


                         1 '3

                         2


 / IORQ

             DD7

                           DD4.4 DD6.2

         14 R 0

   5 At 11 ° WR January 1910 1 8 4 '6

          5 / +1 2 6 9 5

                3



            DD6.3 DD3.2

 D13: October 26 'Aug. 13 ° R _
 D49: 11 September 1912 D Q ° 8

                      11 / C
 D13: Oct. 28 ° S
 D50: 13

                    +5 B

    HLD signal is taken from the leg 28y VG93, / IP - with
VG93: 35, / IORQ - with Z80: 20, and / bit7 # FF - see below.

    For the turbo:
 1. Disable D5: 2, D13: 1928 (D5: 13);
 2. Disable D15: 1 of +5 V, to apply for D15: 1 signal

    / RFSH (D13: 28);
 3. Disconnect the D13: 6 from D1: 8 so that left

    between D13: 6 and a resistor connecting its

    to +5 V.

    By the way, AY-3-8910 (not YAMAHA!) Is also ill
works in the turbo, as VG93, so this refinement
solve the problem of brake AY.

    To repeat: for normal turbo NEED
change the diode VD2 in the scheme of the controller. If it is 
not replace most of the turbo will turboloaderov

fail, since access to subprograms dos
use jp # 3d30. Turbo this very strongly VD2
inhibits switching pages ROM (DOS / BASIC). In
result - all the familiar effects: running hangs
and / or fouls on the drive ...

    That scheme is replacing the diode VD2 (at the Pentagon
circuit controller):

    As there are:

 DD77 (LL1) DD76 (TM2)

          VD2

   January 11 <13


          C3

                    R13


      DD78 (AG3)


              12



   And how it should be:
 DD77 (LL1) LI1 DD76 (TM2)


   11 January 1913 'November 1913

                     12

       C3



      DD78 (AG3)

                       Free element LI1 is in

              12 schemes revised turbo.



    But here, in fact, the scheme itself Revised
Controller BETA-DISK-TURBO in BETA-DISK-TURBO-HD:)

     BQ1: 16MHz DD9


                       DD86: June 2 A0
 DD8.1 DD8.2 DD8.3 DD93: May 14 A1 Y0 4> on

                                          DD76: 3
January 1 ° ° 2 3 1 4 5 1 ° 6 March B0 Y1 7> instead of

                       DD93: June 13 B1 2MHz to

  K43 K43 revision

                                1 S TURBO-SH

                                15 ° OE

                DD5.2

           +5 V

              13 ° R Q 9 on mikrik HD / DD in
 D7 (Z80: 13) 12 D _ drive (see below)
 D88: 11 September / C Q ° 8 / bit7 # FF

              10 ° S


    Products:

    DD1: 1533KP11, DD2: 1533LE1, DD3: 1533TM2, DD4:
1533LL1, DD5: 1533TM2, DD6: 1533LI1, DD7: 1533IE7,
DD8: 1533LN1, DD9: 1533 (555) KP11

    Any chip, except DD8 (LN1) and DD9 (KP11)
can be replaced by a similar series of 555, is
will be reflected only on the load on the PSU.

    Old signals coming in DD76: 3, 2 MHz to
TURBO-SH - CUT!

    The signal from the DD5: Revised September, going to mikrik 
HD / DD in the drive can not buffer (had never

buffered and ribbon cable to the drive I-1m, and all
OK). Sam mikrik HD / DD is located on the motherboard
engine, just above the hole "HD" in the disc (its
More typically glued). One leg is mikrika
usually a common wire, but on the other lifted
control signal for the chip. Here is the second
foot and sends a signal "HD / DD". Yes, with the drive now
Need to remove labels (on 3.5 "stickers! Insanity ..).
If you plan to use 720 k 3.5 "disks (at
these holes "HD" does not), pre-miss signal
"HD / DD" through a resistor 50 .. 100 Ohm, and only then
Serve mikrik in a drive.

    In fact, the Pentagon this generator 16MHz-not
would be needed, but because almost all
pentagonschikov PLL stands for 556RT4, then the scheme is given
given its presence in the controller. If PLL
it does not, DD9: 2 need apply DD76: 6, DD9: 3 -
DD86: 6, and then cut to DD76: 6 of DD92: 3.

    How it all works together?

    Mode density (normal / high) switch
software, bit7 port # FF controller:

         bit7 = 0 - normal,

         bit7 = 1 - high density.

    Fortunately, it turned out that all of the programs
working with the disk, keep this bit is always in the same
and the same state: at the origin. Making the revision, it is 
possible easy to run old prog, they also, as

earlier work with disks 360K-720 k.

    I must say, without a turbo is not working because
exchange rate increases just twice (in
VG93 is served instead of 2MHz 1MHz)-now she
is more than 60K/sek. Including turbo-mode when
execution of the program from the ROM DOS, are seeking to
that the Z80 is still about 112 cycles per
cycle of exchange and he, Z80, working with the VG93 well as
on a normal density.

    At the high-density disk climbs to the 18
512bayt-sectors (size 1.44M) or reached the 10 to
1024-byte (non-standard, but also format1.6Mb).
Thus, easily read / write HD-drives
MSDOS (PS / 2).

    Revised turbo it will always be
included in the disk operations, but only after
the disc will have time to unwind. If the exchange with
drive is on a normal density, the turbo mode can be
disable mikrikom "TURBO / NORMAL" (I wonder what
is needed for a single bend: FUT
by MI'DI). If the turbo was included, it
disabled at the time of promotion drive, and then again
included.

    When positioning for revision TURBO-SH
always goes 2MHz, unfortunately, at a higher
frequency VGshka does not work.

    It is rumored that on some of the two reserve
pin-drive 5.25 "should go
control signal to the engine speed. On
my Mitsumi 3.5 "both will not go back. So
Now, I gave the signal "HD / DD" after 2nd Reserve
Contact (numbered as 4 th to diskovodnom
slot) - and I have works great, and PC.

P.S. All designations are the elements of that scheme
Pentagon, in which the address signals Z80
designated A1-A16. Unfortunately, without removing the cover
drive can not do, but all the alterations in
it - one posting.
P.P.S. A new scheme of turbo-mode has been provided
I Roman Milyukovs, for which he thanks a lot!