Adventurer #03 30 апреля 1996

Железо

Exchange of experience - Features drives of different models. Metody zaschity informatsii nA ZX Spectrum.

     (C) music DJ-DENS



                EXCHANGE OF EXPERIENCE



     Today, in this section you will find a lot of interesting 
information on diverse topics. You will learn about features 
drives of different models, methods copy protection and may be 
able to take a fresh look at a well-known game.



     This category is made up entirely of
Letters from our readers. If you with something
disagree or can add something - we'll be happy to give you my 
word. 

     (C) Ryabtsev Denis


    Drives MS 5305, MS 5311, MS5313



     Technical data:
Qty established by the KMT - 1 pc
The number of working surfaces of the disc - 2
Number of tracks on the disc surface - 80
Rotational Speed, RPM - 300


     If the drive does not read information from disk, it is 
possible that an insufficient clamping heads to the disk. Check 
This can be as follows: lightly press your finger on top head 
drive. 


     Drive with errors reading and writing
All tracks on a disc. The simplest
reason for this - pollution of the block of magnetic heads. If 
you use poor-quality data carriers, the drive is heavily used, 
or the room in which your computer is working - dusty, the head 
block quickly contaminated. Eliminate this problem would help a 
special cleaning disk. 

     There are two types of disks:

   - Dry cleaning drive;

   - Wet cleaning drive.

     The second type of cleaning floppy disk is preferable, 
because with this method purification unit heads, less wear.


     Another cause of error - defective or badly worn media. To
determine this, set deliberately
good floppy and test drive.


     If the drive does not format in
System TR-DOS format or as a unilateral (Single Side / 40 
tracks) it Rather, the fault TR-DOS, rather than drive. Avoid 
this trouble, you can soldered 300-500 pF capacitor between

pin 9 and 10 chips DD4 (561 CP 4)
in the control unit.

     Drive "fails"

A large number of bad blocks when
formatting is associated usually with
poor quality of the disc (Mini Disk, etc.).
It is very likely that you are using a drive
"HD" ("without a ring) with a high density
record. These diskettes about twice
more coercive than the floppy disk
"DD" ("the ring") with double the density.
Data on floppy disk drives "HD" will not work. Use a floppy "DD"
double density "SIGMA", "TANDY",
"XEROX", "KMT", "BIT STAR", etc.

     The second reason is "failure" - a bad clamp heads to the 
disk. Check that when moving the head assembly top head

did not hit. Between the top of the head and head lifting 
device must be a visible gap at the lowered head.


     Differences:


     In the drive MS 5311 slightly modified block design of 
magnetic heads, that can not install the unit heads

MS 5305 to MS 5311 and vice versa. The design of the drive MS 
5313, compared with MS 5311 is missing one element - the 
electromagnetic loading heads. Instead it installed a device 
that is mechanically connected to a locking device, Fixing 
floppy in the drive. When the disk is inserted, and the handle 
lock is omitted down, the upper head is constantly pressed to

diskette. At the opening of the locking device superior head 
play at a safe distance from the disk, thereby eliminated the 
probability of damage of the head at the time of removal or 
installation floppy disk. Blocks of magnetic heads on the 
drives, MS 5311 and MS 5313 are interchangeable. 

     And a little advice on the use of storage and magnetic 
disks:  1. No need to "poke" in the second drive

disk, if there already is a first, as
you can damage one of the heads of the drive, and then roll it 
in general.  2. I do not advise putting wheels on the body

computer, especially in the area of ​​power supply, or left in 
storage - can demagnetized floppy.

 3. If you bought the disc, and after passing along the street, 
especially in winter, decided to play with him, do not rush to 
do that! First let the drive take at room temperature,

otherwise write to the disk may become unusable.

     Anecdote:


     There are two drives "TEAC" and
"MS 5305".
"TEAC": "My boss loves - bought me
American disc with a glossy finish! "
"MS 5305:" A master is nothing I do not buy ... Give chew! "


     (C) SHRSOFT


  Metody zaschity informatsii nA ZX Spectrum



     In poslednee TIME for programmistov,
writing nA ZX Spectrum, acute vstal question
zaschity svoey products from nesanktsionirovannogo 
tirazhirovaniya. Napisanie kachestvennoy prikladnoy or game 
programmy trebuet many truda and vremeni and estestvenno, 
author hotelos to get voznagrazhdenie za his work. But uzhe 
cherez neskolko days ahead posle poyavleniya program

nA rynke nachinaetsya prodazha nelegalnyh
copies and dengi uplyvayut in nechistye hands
a DO NOT to the author.


     Since Vse sovremennye programmy
for the ZX Spectrum in the ex-USSR are written under interfeys 
Beta Disc, then they dolzhna be predusmotrena identifikatsiya 
distribution or klyuchevogo diska, prichem sam drive DO NOT 
dolzhen kopirovatsya nA trekovyh kopirovschikah, though nA 
samom ZX Spectrum. 

HOW it can be sdelat:

1.Mehanicheskaya markirovka disk prostranstva.


     Takoy metod yavlyaetsya samym nadezhnym.
Discs with mehanicheskoy markirovkoy nevozmozhno skopirovat 
dazhe nA bolee powerful kompyuterah. Zaklyuchaetsya it is that

manually with a sharp predmetom povrezhdayutsya
neskolko sektorov diska, zatem with spetsialnoy programmy 
opredelyaetsya kakie a title sektora povrezhdeny and 
poluchennye dannye zanosyatsya in protseduru programmy, 
kotoraya periodicheski proveryaet Apartment belongs Do takie 
zhe povrezhdeniya nA diske from which ona zapustilas. 

     Unto me neskolko raz had vstrechat this metod nA Russian 
programmah, in chisle, popadalis discs with two indeksnymi 
otverstiyami that can schitat variatsiey dannogo metoda, 
although tam proveryalos DO NOT nalichie povrezhdeny, a TIME 
mezhdu pervym and second indeksnymi impulsami. 

     Nedostatkom this metoda can schitat great trudoemkost on 
zaschite kazhdogo ekzemplyara programmy. 


     Kopirovanie diska nevozmozhno.

2.Sozdanie nestandartnyh sektorov, soderzhaschih klyuchevuyu 
informatsiyu. 


     Samy stary and nenadezhny metod.
Zaklyuchaetsya that when formatirovanii
diska sozdaetsya one or neskolko sektorov nestandartnogo for 
TR-DOS razmera (128, 512 or 1024 bayta) soderzhaschie

klyuchevuyu informatsiyu, kotorye DO NOT copied standartnymi 
protsedurami TR-DOS, but schityvayutsya samoy programmoy 
control. 

     When ispolzovanii spetsialnyh trekovyh copiers elementarno 
delaetsya rabochaya copy takogo diska. 3.Ispolzovanie 
programmoy sobstvennoy Disk sistemy.



     In kombinatsii other metodami daet
horoshie rezultaty. Zaklyuchaetsya that
programma ispolzuet its sobstvennuyu
sistemu disk with another chem in TR-DOS
organizatsiey disk prostranstva, kotoraya DO NOT zavisit from 
TR-DOS, and zagruzhaetsya rabotaet in RAM. Takaya sistema 
mozhet be podobiem MS-DOS or CP / M with ispolzovaniem

structures of the FAT or FCB sootvetstvenno.

     Zachastuyu this metod primenyatsya with ispolzovaniem 
avtozapuska, ie at sozdanii sistemnogo (0-th) treka razmerom 
512 or 1024 bayta and popytke chteniya takogo

treka of TR-DOS chast schitannyh dannyh
popadaet nA oblast sistemnyh peremennyh,
as bufer in TR-DOS 256 bayt, then, with zhelanii, we can ensure 
that proizoydet perehod on oshibke nA adres desired. This metod 
was ispolzovan in distributive programmy ASC Sound Master and 
sisteme IS-DOS. 

  Perhaps kopirovanie diska spetsialnymi

  trekovymi kopirovschikami (teoreticheski).

4.Ispolzovanie in zagolovke sektorov nerazreshennyh for 
1818VG93 codes. 

     New nadezhny metod. Zaklyuchaetsya in
that nA any kompyutere, DO NOT imeyuschem
kontrollera VG93 sozdaetsya distribution
TR-DOS disk with klyuchevymi sektorami, nomera
which at zapisi kontrollerom VG93 vosprinimayutsya HOW 
upravlyayuschie codes and DO NOT zapisyvayutsya in takom 
RESIDENCE. Takim obrazom schitat sektor possible, but the plug 
under zapisat takim nomerom VG93 DO NOT mozhet, ie at 
kopirovanii poluchaetsya DO NOT tochnaya copy diska that 
razumeetsya, mozhet opredelit zaschischaemaya programma. 

     Bolee exact informatsiyu of takih kodah can be obtained 
from dokumentatsii nA VG93.


     Nedostatok metoda that the distribution disk nado 
formatirovat nA kompyutere rotary kontrollerom Than of VG93. 
Nevozmozhno kopirovanie diska nA Beta Disc Interface.


5.Ispolzovanie mistakes Beta Disc Interface in komande "chtenie 
track." 

     Simple nadezhny metod. Zaklyuchaetsya
that klyuchevaya informatsiya zanositsya
DO NOT in sektora, a vnesektornuyu in oblast
treka. Blagodarya that in interfeyse
Beta Disc soderzhitsya apparatnaya oshibka,
nevozmozhno pravilnoe vypolnenie komandy
VG93 "chtenie tracks" from za poteri sinhronizatsii dannyh. A, 
because informatsiya soderzhitsya vne sektorov then schityvat 
ee nado this komandoy that nevozmozhno on vyshenazvannoy 
prichine but nekotoryh conditions that can komandoy Vse zhe 
schitat pravilno neskolko bytes. 

     Tak HOW raspolozhenie these dannyh nA
treke mozhet be any (posle any sektora) and spetsialnaya 
programma formatirovaniya it raspolozhenie izmenyaet then 
schitat these dannye mozhet only zaschischennaya programma.


     Nedostatok metoda that when
to wide (bolee 4 ... 5%) otklonenii
speed schityvayuschego diskovoda from diskovoda, nA which 
ustanavlivalas PROTECTION, klyuchevye dannye be DO NOT naydeny.


     Danny metod ispolzovan in programme
for ustanovke zaschity g and a on to:
MICROPROTECTOR.

     Kopirovanie only spetsialno sozdannym for dannogo 
ekzemplyara diska copiers posle vzloma zaschity.



     Bolee informatsiyu details on this
metodu mozhete you get INFOSOFT.


     Vse vysheperechislennye metody (krome
2-nd) obespechivayut nadezhnuyu zaschitu klyuchevoy informatsii 
nA diske. But slabym zvenom in obschey zaschite programm are 
sami metody kodirovaniya, sobstvenno, tela programmy. And since 
obschaya stepen zaschity opredelyaetsya samym slabym ee zvenom, 
then neobhodimo primenyat bolee sovershennye

metody, chem preslovuty XOR for obespecheniya priemlimogo 
rezultata. 

     In sleduyuschem room will rassmotreny
metody zaschity samih programm and their possible uluchsheniya.