drop of solder - HD discs: Finalization of the drive controller to work with HD-disks.

<b>drop of solder</b> - HD discs: Finalization of the drive controller to work with HD-disks.

(C) 1998-1999 AXLR
__________________________________________



     Refinement of the controller

    to work with HD-drives



   Here, given the scheme of the turbo mode, which provides 
higher performance than old. The new test allows for more 113000

cycles / Int.

   There is also improved
circuit switching clock VG93,
Now it should work on any Pentagon.



       The scheme of the turbo-mode Z80-7MGts

       Computer Pentagon-128



                 * 100pF

            D1.1 D2.1

                  ===
 DD3: February 1 '& ampo3 13o R
 DD3: 2 March 1912 D _

                         11 / C Qo8> DD5: 2 (on-board
 DD10: 10o S 12 companies)
 DD15: 5

                       +5 V
 ^^^^^^ All the signals we take from the computer's motherboard.


                                         D3


                       DD45: March 2 A0

                               +5 V 5 A1

                                           Y0 4> DD45: 12

                        DD2: September 3 B0

                                      B1 Y1 6 7> Z80: 1924


                   +5 D2.2 1 S

                                     15oOE

                      1o R
 __ 2 D _
 M1 (Z80: 27) 3 / C Qo6

                      4o S



             D4.1

 / Bit7 # FF 1 1 3
 DD76: September 2


      5 In D5.1 D4.2 "NORMAL"

                                     S1
 HLD 1o R _ 4 1 6 \

         2 D Qo6 5 \
 / IP 3 / C

         4o S D6.1 "TURBO"


                         1 '& 3

                         2

 / IORQ

             D7

                           D4.3 D6.2

         14 R 0

   +5 11oWR January 1910 1 8 4 '& 6

          5 / +1 2 6 9 5

                3



            D6.3 D5.2

 Z80: October 26 '& 8 13o R _
 DD49: 11 September 1912 D Qo8

                      11 / C
 Z80: 28 10o S
 DD50: 13

                    +5 B



   HLD signal is taken VG93: 28, / IP-to VG93:
: 35, / IORQ - with Z80: 20, and / bit7 # FF-cm. below.



    Required switching / Revised

           on-board computer:



 1. Disconnect DD5: 2 (LI3) of Z80: 28.
 2. Disconnect DD15: 1 (TM2) of +5 V, serve
this DD15: 1 signal / RFSH (Z80: 28).
 3. Disconnect the Z80: 6 of DD1: 8 (L 1) so
that remained between Z80: 6 and a resistor connecting it 
(resistor) to +5 V.  4. The signal from the DD45: 10 (TM8) is 
applied to Z80: 6.  5. Replace the circuit VD2 + R13 in the 
circuit of the controller on the element LI1, free element LI1 
find the on-board computer: 


    as it should be:


                  C39

                            LI1 DD76 (TM2)
 DD77 (LL1) LI1

                             '& 13

   January 11 '&

          === C3



      DD78 (AG3)


              12



 6. The signal coming from the DD64: 13 (LE1) is disconnected 
from the DD62: 9 (TM9), skipping it available through the 
element of LA3 and only then serve again at DD62: 9, so:



                D2.3


              10 '& ampo8> DD62: 9

  DD64: September 13



 7. The signal from the DD76: 9 (TM2) served on the DD36: 1
(27c512), the old signal from the DD36: a disconnect.

 8. If necessary, change the DD76 (TM2) in the
a faster, series 1533.

==========================================



  Actually, the revision to switch

          clock VG93

         + Refinement of turbo-VG. "



   Here are two schemes, the first account
availability of sites in the controller, using 8MHz frequency 
(eg, PLL); second - for the controllers, such plots

no.

   Without improvements Pentagon controller
uses only 4 MHz, so if the PLL
in the circuit controller is not detected, has
meaning of such Pentagon becoming the second
scheme.



        If the PLL to 556RT4 is,

        then collect the following:



          D10.1

                     D6.4 +5 B
VG93: 33 1O R _

        2 D Qo6 13 '& 11
VG93: 38 3 / C 12 D8.2
/ STEP 4a S

                              1o R Q 5

          D8.2 2 D

                              3 / C _ D1.2

       13o R 9 4o S Qo6 D9.1
D7 12 D _ 4 '& ampo6 DD76: 3
DD88: September 11 / C Qo8 1 1 3 5

       10o S DD86: June 2

                     50 .. 150 Ohm

    +5> "HD / DD", served on mikrik "HD / DD"

                              in the drive (see below).


                     > / Bit7 # FF


Signal D7 - take a Z80: 13.
/ STEP - with diskovodnogo connector.


   The controller is an old signal emanating
of DD86: 6 (L 1) on the DD76: 3 (TM2) - cut off.
Instead of 8MHz to PLL signals with
D1: 6 (LA3 on completion, supra).

   Instead of quartz 8MHz set of quartz-16MHz.
If DD86 (A 1) 155 series or 555, it is recommended to replace 
it with 1533L 1. Otherwise, the generator, collected on this 
DD86 may not start. 



       If the PLL to 556RT4 no

             is going to like this:



          D10.1

                     D6.4
VG93: 33 1O R _

        2 D Qo6 13 '& 11> DD76: 4
VG93: 38 3 / C 12
/ STEP 4a S D9.1 D1.2


          D8.2 1 1 3 4 '& ampo6> DD92: 3

                     DD86: 6 2 5 DD92: 11

       13o R 9 DD93: 2
D7 12 D _ DD76: 5
DD88: September 11 / C Qo8

       10o S

                     50 .. 150 Ohm

    +5> "HD / DD", served on mikrik "HD / DD"

                              in the drive (see below).


                     > / Bit7 # FF


D7 signal we take from the Z80: 13.
/ STEP - with diskovodnogo connector.


   In the controller disconnect DD76: 4 (TM2)
from +5 V, signal is coming from the DD76: 6 cut off from the 
DD92: 3 (TM2), DD92: 11 and DD93: 2 (IE10) so that the three 
output circuits (DD92: 3, DD92: 11 and DD93: 2) were connected 
to each other. 



 Mikroshemy used in the refinement:


  D1: 1533LA3, D2: 1533TM2, D3: 1533KP11,

  D4: 1533LL1, D5: 1533TM2, D6: 1533LI1,

  D7: 1533IE7, D8: 1533TM2, D9: 1533LL1,

  D10: 1533TM2.



   Any chip, except for D1 (LA3), D8 (TM2)
and D9 (LL1) may be replaced by a similar series of 555. If the 
quartz-16MHz is not used, all the chips you can put a series of 
555. 


   As can be seen, there is already collected refinement
Turbo-VG. " If on finalizing the computer she was standing, 
then put exactly same element of TM2 is not necessary, but it 
is necessary take an existing signal (inverted

Trigger) and apply for D6: 1913 revision.


   Signal "HD / DD" rekmenduetsya apply for
diskovodny mikrik a 2nd backup pin (numbered as 4th on 
diskovodnom connector) - 5.25 "(1.2m) - the drive is

standard signal speed control
spinning (300/360 rpm), and 3.5 "
(1.44M) - The drive is usually free
contact.

   Mikrik HD / DD is located on-board engine over the hole "HD" 
in the disk (it usually glued). On one leg mikrika

is a common wire, but on the other lifted
control signal for the chip drive. Here is the second leg 
mikrika and serve signal "HD / DD".




   Attention! If connected 5.25 "(1.2M)
- The drive, then you simply apply for a
It signals "HD / DD", and modify it
do not want anything out there already has everything.


         *



   When installing this revision is not on
The Pentagon, the main problem lies in the
coordination control of turbo-mode refinement to the scheme in 
a turbo machine. All the rest is done as well as on the 
Pentagon: going to completion in the controller for switching 
frequencies of 8 / 16 MHz, bit7 is added to the system 
controller port (Port # FF) and going to "turbo-SH", if

it has not. Attention should be paid
the presence in the scheme of turbo shaper
/ Wait for processing appeal to the ports.
If this site is not recommended to collect it, such as proposed
above (here assembled on IE7 and LL1).


   If the computer has software control of turbo-mode switch, 
turbo / standard, you can do as shown below:



             D4.1

 / Bit7 # FF 1 1 3
 / DOSROM 2


      +5 D5.1 D4.2 LA3 LA3

                                                     TURBO '
 HLD 1o R _ 4 1 6 '& ampo' & ampo>

         2 D Qo6 5
 / IP 3 / C

         4o S D6.1 LA3


                         1 '& 3' & ampo

                         2


                             LA3


                              '& Ampo



              TURBO


where:

    / DOSROM - a signal to the controller, low-

     level switching (page) ROM

     from Basic to TRDOS;

    TURBO - alarm management software

     Turbo mode, a high level of inclusion
     waiting for the regime of "turbo" Z80.

    / Bit7 # FF - see above;

    / IP - VG93: 35;

    HLD - VG93: 28.