Iron - technology improvements for the Pentagon's screwing the system slot.

<b>Iron</b> - technology improvements for the Pentagon's screwing the system slot.

        PLANET zhelezyaki

(C) U # 74



    TECHNOLOGY TRAINING "Pentagon"

                   FOR
 Transformations in SLOTOTOVUYU (tire) machine.



   As already evident from the title, the article is mainly 
devoted to the owners of the Pentagon. 


   Since then, as I shoved the card in
minitauer and brought to the memory of the Stump
1MB comp somehow quietly grown a variety of device and, 
accordingly, its insides are like on Sodom and Gomorrah, 
together ... And this is despite the what I was originally 
organized something like the system of free raz'ema contact 
connector HR3, removing it required for external devices (ED) 
signals processor.



   When I'm sick of it finally, I
began to think about total reconstruction, in order not to turn 
the situation into an irreversible ;))). By the time I have 
accumulated Several motherboards x2 (3) 86, and my thoughts

turned into a way of adapting this
junk for the needs of native Pentagon ...

And then, luckily, comes Black Crow # 5
article on the topic - "slot system of the improvised stuff." 
Having carefully studied the article, I got down to business 
and has been for quite a while my comp fine feel, eating 
through the backplane and communicating with various devices, 
sitting in enemy ISAshnyh slots ... Thus, proceed directly to 
the point: 


   First and foremost, should bring to raz'em
HR3 all necessary signals from the processor
with wires (MGTF - rulezzz!).

In my case, HR3 pinout is as follows:

         A B
AO1 - / IORQ B01 - D00
A02 - / CSR (CROM) BO2 - D01
A03 - / DOSEN B03 - D02
A04 - / RD B04 - D03
AO5 - / HLT B05 - D04
A06 - / M1 B06 - D05
AO7 - / MREQ B07 - D06
A08 - / RFSH B08 - D07 [gnd]
A09 - / SELECT3 (06) B09 - / WR [gnd]
A10 - / IP (08) B10 - GND
A11 - / SELECT0 (10) B11 - GND
A12 - / SELECT1 (12) B12 - GND
A13 - / SELECT2 (14) B13 - GND
A14 - / START (16) B14 - GND
A15 - / DIRC (18) B15 - GND
A16 - / STEP (1920) B16 - GND
A17 - WRD (1922) B17 - GND
A18 - / WRG (1924) B18 - GND
A19 - / TR00 (26) B19 - GND
A20 - / WRPT (28) B20 - +12 V
A21 - / RDD (26) B21 - +12 V
A22 - / SIDE1 (28) B22 - +5 V
A23 - / CLK B23 - +5 V
A24 - / IORQGE B24 - / RESET
A25 - A15 B25 - A00
A26 - A14 B26 - A01
A27 - A13 B27 - A02
A28 - A12 B28 - A03
A29 - A11 B29 - A04
A30 - A10 B30 - A05
A31 - A09 B31 - A06
A32 - A08 B32 - A07


  In parentheses are the number of standard
raz'ema FDD, in which these signals are derived.

As can be seen from the table, I had to sacrifice contacts B08 
and B09 to accommodate new signals. Do not forget to post

Massacre scalpel submit GND on track
which went before, on the B08.


   Next you should create a signal
/ IORQGE. To do so ruthlessly otkromsat signal / IORQ from the 
outside world and submit it directly from 20nogi Z80 (DD13) on

4DD52 (LL1) and the contact raz'ema A01 HR3.

   To serve 5DD52 / IORQGE with A24 (HR3). And
eventually remove from 6DD52 signal which is fed to those 2 
points that were previously connected to the 20 foot Z80. We 
hang up resistor 510-820Om between 5 and 7 foot DD52 (tightens 
the zero line / IORQGE) and turn on comp. Everything must 
fluksuirovat otherwise seek snot where payali ... Why DD52? 
Because it is close and the element of freedom;) 


    Free elements m / circuits on the board

         Pentagon computer-128.

Example: DD52 (4 OR 5 = 6)
 4 and 5 - input;
 OR - part of the action performed;
 = 6 - output, leg room 6;
 / - Inversion.


   LL1
DD52 (4 OR 5 = 6)
DD65 (9 OR 10 = 8) - not all motherboards!


   LI1
DD82 (12 AND 13 = 11)
DD97 (9 AND 10 = 8)

    (12 AND 12 = 11)


   LN1
DD51 (5 = / 6)
DD84 (3 = / 4)
DD86 (11 = / 10)

    (13 = / 12)


   LN2
DD94 (13 = / 12)
DD100 (13 = / 12) - CMOS-series


   LP9 (repeater)
DD95 (13 = 12)

This list is useful to you, and
repeatedly ...

As / DOSEN recommend
such a thing (Soundrive not grunts when accessing kontolleru 
FDD and disappearing bugs when working with a disk, if they 
appeared): signal 4DD85 served on 13DD86 12DD86 and

remove freshly / DOSEN to contact A03 raz'ema HR3.

For the formation / CLK doing the following:

   Remove the signal from the track, suitable for
9DD65 and wire served on 11DD86, with
10DD86 throw light on the contact raz'ema A23 HR3.
Once again - signal buffering
C25 not implemented on all versions of the Pentagon-128 
motherboard, sometimes it goes directly into 6 Z80 pace with 
8DD1 (3DD5), which in principle fine, but: 


      9
 C25 1

     10 6DD13 (Z80)


                1K


              +5 B


   If you are on the board and there is no such
muz.soprotsessora removal of the external slot
nachimayutsya glitches, you probably need to do ...

There may be outcries from the audience in the
sense that the city all fuck this
garden, if you can dilute a small interface board with the 
buffered signal and the panels under the Z80, which can 
immediately will make the standard system connector

without the FDD, and place it in the socket under
percent ... I agree, but just in case
if the socket on the motherboard you PUSH.
 And it will agree, it is unlikely, taking
given its size and cost. Therefore I had to go the other way.

Thus, the system connector we have organized and
You may even have to solder on a reciprocal
of any peripherals, if its one or two things;))
If you want more, it is necessary buffering signals used by 
external devices.



     There are two sober buffering schemes:
ZX-Bus (Spectrum Expert # 1,2) and the previously mentioned 
scheme Stotsky Andrew aka Veles from the Black Crows # 5.

Which to choose - your cause. I stopped
on the second.


     After some deliberation, I realized that
I do not like the idea of a trail unknown
length at which the signals will fall
on the motherboard 286 th for further buffering and 
slotirovaniya :))).  Takozhe wanted to change the FDD cable to 
the standard and, therefore, removable. In

result has been divorced board with a ruler
buffer elements, control logic,
FDD and another Coy what things to
comfortable work that goes into the
connector HR3, and since it was the train
286 th:


   FDD To Track

                            Counter

    La2 LA3 LA3 LL1

   1 1 1 1
A1 A32
B1 Output to crossboard B32

          10k * 8 (resistor assembly)

   January 1 AP5 AP5 ADR ADR

   AP6DATA AP6 SYS January 1
B1 B32
A1 Input from computer A32

Please note: the scale is not respected!

Explanation of the scheme:

Connectors SNP64:
Dad - Output to crossboard;
Mom - Input from computer.

"Stray" LA3 used for the following
goals:
 FDD
/ WRPT 'o'

                         o / WRPT for HR3



                     Grn Red

                      > <

                   330Om

Ie for hardware write protection for
disc with indication of:
Grn - Green LED-entry is permitted;
Red - Red LED-entry is prohibited.

Connector "The Track Counter" - this is the
indicator of the current track FDD.

Built-in FDD - standard connector for a standard cable of this 
device (do not get confused with wiring in the even-odd side) -

connection from HR3 carried by wires,
as density printed wiring is already high for a home-made: (


     For the manufacture of printed circuit board is very
I recommend selling now in stores and on kantstovarnyh 
baroholkah (much less) permanent markers with the inscription 
Water Resistant (Water Proof), For All Surfaces and Water 
Resistant, For Glass, Metal, etc. Sometimes the inscription is 
not (as For example, in a remarkable shestirublevom

Centropen'e) - then check the packaging
- I'm on it, then everything is written. For a complete
comfort must have markers with the following diameters writing 
cores: 0.6mm (0.8mm), 1.0mm, 2.0mm, and a healthy (they are 
always full) for a sketch of the free surface under the 
metallization. Store they should be strictly in a vertical 
position and tightly closed after use.

Draw a track should be no separation, no
mazyukaya on it.
Color - black, he somehow more resistant (perhaps because of 
the pigment). 


     Next unsolder loop response to
the connector "Output to crossboard" and
proceed in accordance with the
Article from chevo # 5 - remove slot
SIMMs and replace them payaem Mate
under the plume from the board buffering. Then wire MGTF (very 
convenient - no insulation melts) connects the ISA-slots, with 
this connector. 


     Another nuance - I have all my peripherals are made with 
their hands, therefore I do not very interesting was compatible 
with Kai / Scorpio by slots, so I left the power of +5 V, +12 
V, ground to ground and thus get rid of headaches for watering 
/ drill-proof / insulation / soldering and the like scales ... 
In addition to divorce and prilyapat adapter to the 
"proprietary" periphery - the case for half a day, if it comes 
to that. 


     Signal conditioners / IORQGE collect from each slot at 286 
(386) motherboard on two elements LL1 - they are there;)))



     Well, that's it - you're the owner of the Pentagon with 
the bus and slots, koi can juzat on discretion. Go for it!


Appendix:

 Pinout PentagonISA-slot


      B A
B01 - GND AO1 - D07
BO2 - / RES A02 - D06
B03 - +5 V A03 - D05
B04 - A04 - D04
B05 --5V AO5 - D03
B06 - / M1 A06 - D02
B07 --12V AO7 - D01
B08 - / DOSEN A08 - D00
B09 - +12 V A09 - / IORQ
B10 - GND A10 - / IOGE
B11 - / RDR A11 -
B12 - / CSR A12 -
B13 - / WR A13 -
B14 - / RD A14 -
B15 - A15 -
B16 - A16 - A15
B17 - A17 - A14
B18 - A18 - A13
B19 - A19 - A12
B20 - CLK A20 - A11
B21 - A21 - A10
B22 - A22 - A09
B23 - A23 - A08
B24 - A24 - A07
B25 - A25 - A06
B26 - A26 - A05
B27 - A27 - A04
B28 - A28 - A03
B29 - +5 V A29 - A02
B30 - A30 - A01
B31 - GND A31 - A00


P.S. If the editorial deems necessary and possible, the 
application will be located both articles on the topic. If you

they were not found, welcome to the above journals for review.

     In case, if their not there,
inform - the article from chevo # 5 admitted ochepyatka:



  F 18 0 0 2 F '

  RD / Jan. 17 Jan. 3 RD / '

  WR / February 16 February 4 WR / '

  MREQ/15 March 3 5MREQ / '

  M1 / 14 April 6 April M1 / '

  BAK / 13 May 7 May BAK / '

  HLT / Jun. 12 Jun. 8 HLT / '

  RFSH/11 July 7 9RFSH / '

* +5 V 1 SA

   GND 19oOE AP6


the leg number 1 should either submit Gnd,
or change the input and output places.

Contact:
I-Net: u_74@mail.ru
ZX-Net: 500:8462 / 128.17
Post: Samara-065 (443065),

      ul.Pugachevsky tract

      d.66, kv.3
Car Sergey Anatol'evichu