Open Letters #03 05 мая 2000

Nemo open letters № 3.5

445027 25.04.2000


    Hello, dear (c) Nemo!


   1. Got your answer and floppy "Open
letters ". Thank you so much!

   2. Scheme KAY-1024 I requested to send,
to learn how it works.

   3. Scheme programmer RPZU-UV I
need to figure out whether it can physically connect to my 
computer. Y CENTRONICS I have the following signals:


     1 - STB

     2 ... 9 - 00 ... 07

   10 - ACK

   1914 - BUSY

   1916 - INIT

   1917 - SELIN and is YM2149F, a
port is available.

   4. Scheme BP9022 I need not self-repetition, but in order
to see which overload protection he has, and whether there is 
in it scarce parts - and suddenly breaks? 

   5. Tried to connect the 3.5 "drive;
in the drive is mikrik 0.72/1.44, to seal the hole in the 
floppy disk 3.5 HD, including formatting, after which was an 
error in the 9-m sector.


   Will it work with my floppy
Your drive pp 1.11.1.1 for 120 USD?
Sending samples to a single 3.5 "diskette.

   And:

   The table describing the ports KAY-1024
indicated that the Kempston joystick selected
"1" to A0, and not "0" in the A5, which ranks D0 -
D2 port configuration JFFD define page of RAM to 0 sector, and 
not in the third that level D4 same port switches ROM 128 / 
TRDOS, instead of ROM 128 / ROM 48. 

   It's a typo or features KAY-1024

   Letters to the "Open letters" I learned that
you have a set of technical. Doc. on 512VI1
15 USD Please send me. Money (15 *
3.6) translate. Mark at 30 p. invest
in the past and a new edition of "Open letters".

                                      N.


              Dear N!


   1. Diskette "Op. Let." new address
for the first time will be sent for free, so
that does not thank for that.

   2. According to the scheme: see letter 445027 /
10/04/2000 - nothing to add.

   3. If you list all available
signals, then connect will not work. In
Centronics, according to standard specifications NINE control 
signals / lines, and you have only five. In KAY'yah 256 - 1024 
sold eight signals / lines (Ninth Line - a signal AUTO, pin14 
XS1 DB255 - used to supply power

on the expansion module) on a standard specification - plus an 
additional line "Earthy" lines of the standard specification, 
since using bidirectional line AY8910 (FM 2149F - analog) port 
B. For the programmer need all eight

lines. Using all available
standard lines leads to a simplification of the programming 
circuitry and its cheaper. 

   4. Overload protection BS 9022:

   - Excess output voltage
in excess of 6.0 v (channel 5.0 v) (which does not prevent
this unit burn through some of the screws);

   - Through the +12 v protection through the crystal 7812 
(KREN8 - a letter I do not remember Reference lazy to climb) - 
ie Heat + current. Judging from the radiator, 1.0 - 1.5A he

pulls (in a reasonable range of temperatures
inside);

   - Protection against overcurrent channel
+5 V based on the properties of the blocking oscillator with 
inverse diodes. 

   5. Among the items that can not be attributed to the "grass" 
should be assigned thyristor KU112 (although it is widely 
common in TV-receivers - in the same PSU - for example, mark 
MP-3) and transistor KT872A. This transistor to the other not 
changes. There are, of course, exotic foreign analogues (such 
as BU508), - but they you know ... Everything else is available 
in the or less. KD219 (Schottky) can be reduced

need to be replaced by KD213 (with the deterioration of 
efficiency). 

   6. It is difficult to say whether to work.
When sold COMPUTER ASSEMBLY, then
Something can be sure when the parts - nothing can be 
guaranteed. And the thing is not in the gland. Practice shows 
that 30% failures - some features of this equipment 40% - 
curves handles connecting, and only 30% - actually a marriage 
mail (5%) and actually you send devaysa

(25%). It is clear that research your
floppy no one will - it is sent
Back to you. More important than another time - compatible 
drives / floppy drives 3.5 "between themselves - it is lower 
than 5.25, and is, In general, statistical nature

(Ie, a floppy disk or what not to say).
On the other hand, a disk drive 1.44
You can always find the right shop
/ Type of disks that will work. Clearly, this costs money, but 
it's better than the 3.5 "drive (for free), for which

do not drive (or in a store, either in
trash, or the mother company,
- "Seamless" technology).

   7. Kempston joystick really choose "1" to 0. But it really
for cars with the "empty" slots basket
XS6-XS8, ie NAME AND PROPERTY FOR most of the motherboard. 
Established in expansion of the basket device can change MEMORY 
CARD PORTS AND ADDRESS by masking signal ports

IORQ * / IORQGE / *: 17V/13A both the motherboard and ports 
according to seniority in the basket (on the bus), - geographic 
addressing "devices on the bus. 

   8. Bits D0 - D2 / 7FFD really define page of RAM in the 
third sector, ie this is pure typo. Thank you

reported. Sent to the scheme - this
(Ie a typo) for another three years no one would
do not know, but so did a good deed. Rank D4 actually switches 
PZU128 in PZU48, in fact, it's out in TRDOS. Because

purposes other than getting into the TRDOS,
the audience in front of him does not put. However,
table should formally describes the architecture, the essence 
of architecture is explained as through the accompanying text - 
so it can also be considered a typographical error. Again

Thanks - I think for 2 hours, I handle
(Handles, knobs) to edit the circulation
"User's Guide KAY-1024". Clearly, this costs money, but for 
their Each pays own stupidity.


   9. Tech. Doc. is at MS146818, and
512VI1 - is analog. Degree of responsibility for compliance 
rests with those who "Skinned" this crystal. Probably, these 
discrepancies (for use MS512VI1 in amateur work) are 
insignificant. It can be sent on a prepaid basis (rate in May - 
3.7) in the event that you confirm in writing (eg, Kvitka mail 
order) that will not use network resources

for downloading pirated (stolen) software.

   10. As already stated, sent to you
instance of "Op. let." pay is not necessary.
In addition, you write: "the new release Op.
let. "What?" You did not specify the date wording
so the order will be renewed by letter.
Current edition - 04/04/2000. In the first instance paid by 
"Op. Let." sending "User's Guide

KAY-1024 ". There's more information
by KAY-1024, in addition, many errors
taking place in the leaflet on
KAY'yu, corrected.

                                (C) Nemo.

454021 14.04.2000


              Hello!


   I'd love to hear from you
price of iron for ZX, and catalog software
if one exists. Particularly interested in computer KAY!

   How are things going Spectrum'a in St. Petersburg?
According to rumors you have left a couple of games and new
discs under the IS-DOS?

   On this for now. Thanks in advance
for the answer.

                                       N.


                               25.04.2000


              Dear N!


   Actually, the answer there is nothing.

   1. Directory software is not - the question to the wrong 
address. 

   2. Read the details KAY-1024,
than in the flyer can be ordered
"User's Guide KAY-1024". It
already published (see price: 2.4, 2.5
cu * 3.7 (May) = 9.25 rubles. You can pay for stamps.)

   3. With Spectrum'om in St. Petersburg as all
always (see "Op. let.").

   4. Got game MD2000 (TETRIS); can
order: $ 10 By ISDOS'u see price and
"Op. Let."

                                (C) Nemo.

346340 16.04.2000


   Hello, my dear Captain
Nemo!

   You are worried about SLON of SCG. Finally
I was able to connect gained 3
Months ago you KAY-1024. In fact, the connection has taken on 
the strength of 2 days, all rest of the time spent on searching 
and arrangement of the body (was razdrakonen pisyushny desktop: 
you can tell, no one desired deuce - 286 th - acquired a new 
life! 

   Question: how far can I fly the 286 motherboard, abandoned
with the 4 th floor?

   The answer: exactly 84.56 meters:)

   What a great and fun flooded
old programs from a TURBO! A color-something
In my opinion, have become even juicier! KEMPSTON
joystick - a standard! Ceased to go crazy
Claudia (very specific "iron" glitch
Capture interrupt IM2) ...

   However, the harsh reality makes
wipe away the tears of emotion and face the truth, ie it is 
time to say a few words about the perceived and actual 
deficiencies: 

   1. Noticeable and for some reason can gradation of 
brightness in black, well, that is, can distinguish PAPER 0: 
BRIGHT PAPER 1 and 0: BRIGHT 0! (???) You did it on purpose

or accidentally, you can fix it with jumpers or not? The fact 
that the indistinguishability of the bright and black fade 
color and are used by many artists (including your humble 
servant) as a transition between bright and soft colors. So good

would bring everything back into place!

   2. A slightly different sound became AY,
when I shifted it to KAY from his
Pentagon'a. Our musicians say
that had more bass and distorted
Some drummers. Can and should
be? Although, honestly, the difference is not
is very high ...

   3. What can I say, 97% compatibility -
a 97% compatibility. There's nothing
be helped. In this case, blame soft-maker'y ... It is, in 
principle, to hell with them, with demos and toys that do not 
go on KAY'e, but ... But when it begins to fail

(Does not work at all) my favorite assembler XAS, well, sorry, 
it already goes all bounds! And this is the moment when

work on our (SCG) project in the
swing! It's a nightmare! Hmmm ... Now
have to break XAS ... (Hacking processing ...)

   Y y-y-y! ... Well, a fig yourself! This is
Max Petrov gave! But for such cases in our
Century developed tricolor and chankovyh textures have hands 
cut off: it is there should have been think of switching pages


    LD A, PAGE_NUM
    OUT (# FD), A?!?


   It is not surprising that KAY'e, where
Page klatsat through # 7FFD and # 1FFD
Such a system does not rolls.

   I appeal to the sensible world population SPECCY: Use full 
PLZ addressed when applying to ports:


    LD BC, # 7FFD
    LD A, PAGE_NUM
    OUT (C), A

Lose a couple of bytes, but get the respect and authority. 
Believe me, it's worth that!


   4. In the price indicated that the board
KAY-1024/3SL/TURBO completed trail
3.5 "and 5.25" diskovertov, but such a premise I, alas, not 
found. And return connector printer did not have two

mounting bolt - not poryadochek sir.
I took the train, but I do not need a printer,
so there is nothing to expel is not necessary, just
closely monitors the delivery ... it
for the future, no offense.

   In general, produces a nice KAY
impression of professionally made,
reliable and promising machines.

   PEOPLE! GET KAY!

   KAY - This is the future SPECTRUM'a!

P.S. During the florid buzzing
forgot to mention the most important:

   I would like to make an Upgrade of its
KAY'ya, namely to buy:

   - Controller HDD (without hard drive)

   - GENERAL SOUND sound card.

   I hope to order them immediately upon receipt
Your response to the price (if prices are not
have changed). Grades 5 rub. attached (although perhaps you 
have changed prices, for which I apologize in advance). 

   And how are things with MKEY move? Not
Did W. Mednonogov FT-2 (and whether its release at all)? As 
there Peter affairs with SPECCY?


   For symmetry, let bow. I wish
good luck and creative successes. Please send the price.

   Sincerely, SLON / SCG.

P.P.S. Here the people are interested, it is possible
Is access to the Internet through KAY'ya
(Referring to E-mail) and that this
necessary. Thank you.

P.P.P.S. Could you explain the popular method of switching 
memory pages (Say, will not be able to order all 1,024

Kb? Well, excuse me, you underestimate us!
Would be a memory, than her score, WE figured:) !!!). Also 
wondering what page is put in place a zero-ROM

address? And that means the bits A17, A18, AUTO, Q6, Q8? I am 
confident that the answers to these questions will be 
interesting to hear not only me. Thank you very much.




                               03.05.2000

             Dear SLON!


   1. Gradation of brightness. It's really
takes place. Remove the bad effect may be as follows:

   Reduce the output level of
RGB connecting resistors to the ground to
these findings. (In KAY'e it is higher than normal standard - 
but many in this If it is not small - can be reduced). In

connection cable for SCART and
done. There divider of 3:1, ie 150 ohms
consistently in the signal line and the RGB
75 Ohm - SCART input resistance of
RGB. In this case, the effect disappears, ie
it's just a problem connecting to the TV.
(See "User's Guide KAY-1024",
Fig. 8.2). TVs are different ways
connection as well. You just need to correct
connect.

   2. Change in sound AY quite understandable. As there are 
some problems, then immediately find someone else "curves

pens, which have no relation to (a) Nemo. (But somehow I have 
to take the rap for these idiots - to explain how much will two 
and two for YOUR SCORE).


   In Pentagon'e differently arranged video processor. Video 
processor, in turn, synchronizes (clocks) AY. B Pentagon'e 320 
rows of 64 microseconds, KAY'e - 312 lines of 64 microseconds, 
for a total interruption (INT'y) that are tied to frames 
following with different periods. Ie we have: 

   in KAY'e:

         64 ms x 312 lines = 19968 ms

        or: 1000000 / (64 * 312) = 50.080128
Hz

        believe this error:

        (50.080128-50) / 50 = 0.0016025, (+)
ie error (deviation from the standard
due to the fact that all frames have № 312
lines, not alternate, as we set
on TV-standard 312/313) = 0.16%.

   B Pentagon'e:

   64 ms x 320 lines = 20480 ms

   or: 1000000 / (64 * 320) = 48.828125 Hz.

   believe this error:

   (48.828125-50) / 50 = - 0.0234375 (-)

   Please note that the error is no longer the order of ten per 
cent (as in KAY'e), and order of a few percent, namely,

2.34375%. Here's this little mistake and you perceive as "more 
bass and curvature shock. "Actually, Warp

occurs in Pentagon'e. In a second
(This is the SI system) should be 50 frames
(Half-frames), and not 48.828125. Otherwise, there are 
glitches, koi and breeds Pentagon'schiki. After all, they are 
thought of as that INT'ov 50 pieces in second, and it is not. 
It would not have been noticeable, but clock speed AY and 
Pentagon'e, and KAY'e same. Therefore TON identical, but differ 
TEMP. 

   3. With regard to XAS'a, it is not long
secret. Moreover, of those programs that
do not go to KAY'e, STILL could not find programs that do not 
work because some glitches, failures, the curvature

KAY'ya (yet been reviewed 5 pcs. Programs) - ie it handles the 
curves ... Ie ability to make machines with a vengeance KAY 
covers at the moment ability to make program. It is 
understandable. Programs written all and sundry, and, as a 
rule, amateurs. Machines also manufactures the professional - 
and the corresponding difference. Mistakes do and those others, 
but PROS obliged to correct them, and hacks - spitting on them. 
Here's to whom you will apply for failure XAS'a? You pay for 
it? - Probably not. A therefore, handles, knobs ...


   4. Plume was forgotten the attachment. What
As bolt - again to blame. Well,
not find such bolt. In a foe
feet and inches (not the SI system), ie
their parrots. Therefore, without the bolt.
These connectors are used, obtained in bulk at ridiculous
price. BRAND NEW complete machine assembly can not be - the 
price tag vzopret (Any high level). In return:


   1) I send a disc with OTRIHTOVANNYMI programs that do not go 
to KAY'e, 

   2) I send "User's Guide."
At the same time consider the incident closed.
(Plus, "Op. Let." Notice of
price list, which now marks must be on 7 rub.
or 15 rubles. if with "Op. let.").


                                (C) Nemo.

P.S.

   1. About MKEY yet uncertain.
FT-2 has not yet emerged. The program, like
believe, will be done - but when?

   How are you doing with the Speccy - see "Op. Let."

   2. The yield on the Internet at KAY'e potentially possible, 
but pointless. Without going into details as to whether there 
is Does what the meaning of the Internet in general and in the 
presence of users Spectrum'a in it particular, we can only say 
that it is not a technical problem. Nehalyavny Internet 
impoverishes ordinary citizen of Russia for about 3-4 months. 

   Freestuff Freestuff Internet and assumes a PC. What does the 
Spectrum? Enough to join the clerks. 

   As for the possibility to earn
money Internet'e, these opportunities
as he Internet, virtual. In the store the same reason, require 
real money. In Meanwhile, you can use the Internet

at the transport level (well, something like this,
as (a) Nemo uses e-mail. By the way,
mail in this sense, even better, because law prohibited 
censorship of letters, and Internet'e there is such a thing, as 
COMP. Incidentally, this trick was invented precisely

for PC users. When such a crowd - and this is
it crowd - going in one place
needed care. The crowd she is a crowd -
primarily it represents a danger to herself. As they say, for
that fought for it and ran), but
This requires developing a network structure in the field. With 
regard to KAY'ya, then BBS is required under ISDOS, - and, this

requirement (under ISDOS) universally, without regard to 
KAY'yu. If it is not observed, the BBS: 1) weak scalability, 2) 
inflexible (by software, interface, Technology transfer, 
organizational and administrative decisions), and 3) demands 
for a set of PC-to, ie required to solve problems that can be 
solved only under OS 4) expensive and impractical to use.


   Customers who as individuals lone "crawl" the Internet 
separately, As a rule, break off - because of objective reasons 
for which the equipment and Its specifications are not

irrelevant.

   3. Methods of switching pages - see
"User's Guide" and "Op. Let.".
Not an ounce is not sorry - but understand this
stupid! "Answers to the questions ..." contained in the User's 
Guide "and" Op. let. ",-who a year already (in" Op.

let. "), look carefully" Op. let. ",
- I can not EXPLAINS EVERY thing
well - I did not have.