drop of solder - Finalization of the Pentagon to work with high-density disks.

AY-Track: IRONMAN TOXICOMANIA (VOL.2)
__________________________________________


(C) AXLR
__________________________________________


     Refinement Pentagon'a for

       with high-density disks



   So, what should I do to earn a regular controller with 
drives high density? If your computer has already installed the 
turbo mode, then all the improvements takes literally an hour, 
and if not, why - - Is proposed here is a modified scheme of 
turbo for the Pentagon - collect. 

   So, even if you already have turbine
is, it will have a bit to finish. In fact, improvements are 
two: one to activate the turbo when running DOS, the other 
forms / wait for the processor to handle ports.


   On the latter should say especially. Noted that some 
instances of KR1818VG93 namely, 1993 and later model year, do 
not work in Turbo. The quality of exchange with the disk is 
like and does not affect (Not specifically tested), but who is 
it VGshku knows.


   Would be best to bring the full scheme
turbo for the Pentagon, but with modifications:



                * 100pF

            LA3 TM2 and TM2-free items

                 === LA3 can be found on board
 D3: 2 '° 13 ° R company
 D3: March 12 D _

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

                      +5 V



                                         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: 1924


                   +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,

    apply for D15: 1 signal / RFSH (D13: 28);
 3. Disconnect the D13: 6 from D1: 8 so that

    remained between D13: 6, and resistors
    rum, connecting it to +5 V.


   By the way, AY-3-8910 (not YAMAHA!) Also
does not operate in the turbo, as VG93, so that
This revision will solve the problem of brake
AY.

   To repeat: for normal turbo
We need to change the diode VD2 in the scheme of the controller.
If it does not replace most turboloaderov the turbo will fail, 
since access routines use DOS

jp # 3d30. Turbo this very strongly VD2
inhibits switching pages ROM (DOS / BASIC). As a result - all 
the familiar effects: running hangs and / or crap on the disc 
... 


   That scheme is replacing the diode VD2 (at the Pentagon 
diagram of the 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 a scheme to

              12 turbo processing.



   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 the DD76: 3


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

                           DD93: June 13 B1 on completion

    K43 K43 TURBO-SH

                                    1 S

                                   15 ° OE

                 DD5.2

           +5 V

              13 ° RQ 9 in 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: 1533L 1
 DD9: 1533 (555) KP11



   Any chip, except DD8 (A 1) and DD9
(KP11) can be replaced by a similar
555, it will be reflected only on
load on the PSU.

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


   The signal from the DD5: Revised September, going to mikrik 
HD / DD disk in the drive can not buffer (do not buffer it, and 
train on the drive I-1m, and everything is OK). Sam mikrik HD / 
DD is located on board the motor just above the hole "HD" in 
the disc (its More typically glued). On one leg mikrika is 
usually the common wire, while the other removed control signal 
for the chip. Here is the second leg and give a signal "HD / 
DD". Yes, now you need to drive away stickers (on 3.5 "- 
stickers! insanity ..). If you're going to use 720 k 3.5" 
drives (which are holes "HD" does not), pre- miss signal "HD / 
DD" through the resistor 50 .. 100 Ohm, and only then to serve 
it mikrik in the drive.


   In fact, the Pentagon this generator, 16MHz would not be 
needed, but because almost all pentagonschikov PLL stands for 
556RT4, then the scheme is given with regard to its presence in

controller. If the PLL does not, DD9: 2
must be submitted 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 so happened that all the programs that run 
with the disc, keep this bit always in the same state: at the 
origin. Making the revision, you can safely run

old prog, they also, as before will
work with disks of 360K, 720 k.

   I must say, without a turbo is not working
as exchange rate rises exactly in the
twice (at the VG93 is served instead of 2MHz
1MHz), now it is more 60K/sek.
Including turbo-mode when running the program from the ROM DOS, 
to the point that a Z80 is still about 112 cycles

the cycle of exchange and he, Z80, works with VG93
as well as on a normal density.

   At the high-density disk climbs up
512bayt the 18-sectors (size 1.44M) or to
Reached the 10 1024-byte (non-standard, but also
format, 1.6Mb). Thus, easily read / write HD-drives MSDOS (PS / 
2). 

   Revised turbo it will always be
included in the disk operations, but only after the drive has 
time to unwind. If the exchange with the disc goes on the usual 
density, the turbo mode can be disabled mikrikom "TURBO / 
NORMAL" (interesting that this needed for a single bend:

FUT by MI'DI). If the turbo was included,
It is deactivated at the time of promotion drive
and then on again.

   When positioning for revision TURBO
-SH is always going 2MHz, unfortunately, more
high frequency VGshka does not work.

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


P.S. All elements of the notation given for the
Pentagon scheme in which address signals Z80 marked A1-A16. 
Unfortunately, without removal of the casing drive can not do,

but all the alterations in it - one posting.

P.P.S. A new scheme of turbo-mode has been provided to me by 
Roman Milyukovs, for which many thanks to him!