Can RU7 V be used instead of RU7 G?
ZXNet echo conference «hardware.zx»
Hello, The Exploited
Is it possible to solder one at a time into empty spaces?
Hello Ronin
Stupid question: is it possible, having desoldered all ru7, then solder one by one (well, or by
two at the extreme), checking the functionality each time?
If yes, then in what order according to the scheme?
I'm just afraid I'll re-solder everything again and it won't work again. And the panels
I don’t want to bet so that the contact is more reliable.
PS; test; I don't have a ROM :(
Hello, The Exploited
but in general, interference indicates that what is being read from memory is not at all what is being read - again
check the data output of the switches (with an xs tester - look at the tracks on the board). a
If nothing else helps, unsolder ru7 one at a time until the interference disappears.
then solder again one at a time...
Hello, Evgeny Muchkin
Evg> I did it, but it turned out worse, something I didn’t do well, in the end it was a computer
Evg> doesn't work at all. I took out the ROM - there is no mattress. And with ROM there is a black screen and
Evg> large white squares at the same distance from each other + as
Evg> some kind of interference. I don’t know where to run now, although I did everything
Evg> as neat as possible.
Evg> Is it possible to diagnose this with only a tester at hand?
It looks like the SD has been stuck. unplug the processor (or press reset) and try everything one by one
SD lines (and then ShA in one) - there should be approximately the same voltage
everywhere. I actually treated computers like that at one time, even without a tester =)
Hello, Evgeny Muchkin
you'll hardly see anything
Hello, The Exploited
Friends, please tell me imported analogues of k565ru7g
Hello, Evgeny Muchkin
Evg> Friends, please tell me imported analogues of k565ru7g
KM41256 (samsung)
LH21256
D41256
Hello, CHRV
I found this: http://www.megachip.ru/item.php?item_id=11747
Will it do?
Hello, The Exploited
The> install the sim and don't worry
I think it’s easier to dig up 41256 in the junk from 286x than to solder a sim for someone who wants it
I have no idea how to do this...
Hello, Evgeny Muchkin
install sim and don't worry
Hello Ronin
:) 16*8=128 possible zalipons versus ~20 wires and one booter
Hello dhau
Question 1; Nadybal; These are: IN41256P-10, will they work?
And, if there has already been an offer regarding SIMM...
I have some kind of 1 meg SIMM lying around somewhere. A couple more were born from here
questions :)
1. Is any SIMM suitable (you can tell by appearance, if the photo
I'll attach it)?
2. Where can I get a diagram for connecting a SIM to a scorpion in order to use the entire SIM from 1
Mega by Scorpio standard?
3. I have port #1FFD blocked on the board, will it work after
SIM connection, or you might forget about it (which you really wouldn’t want).
Thanks in advance.
Hello icebear
ice> Will do. "P" - are they by chance not in PLCC housing?
Nope, it looks like a DIP made by Integral!
http://www.bms.by/products/russian_2002/dram.htm
Hello, Evgeny Muchkin
The sim is preferably 30 pin. for starters, it’s better to just use it as 256kb (25%).
If everything works out, then do meg. ready-made circuits for 1mb scorpion, something is not
I remember, although I looked in deja-vu magazines, it seemed like it was there. there will be a blocking
work fine.
Hello icebear
ice> "P" - are they in a PLCC case?
yeah, Plastic DIP for sure
Hello dhau
dha> now I’m thinking about what to do with them :P
What, 16 megabytes :D
Hello, The Exploited
I have 500 pieces of NEC 41256 at 60ns from 1994.
I foolishly bought it on eBay for $100 + shipping, now I’m wondering what to do with them :P
Hello, Evgeny Muchkin
Evg> Question 1; Nadybal; these are: IN41256P-10, will they work?
They'll do. "P" - are they by chance not in PLCC housing?
Hello dhau
dha> I have 500 pieces of NEC 41256 at 60ns from 1994.
dha>
dha> I foolishly bought it on eBay for $100 + shipping, now I’m wondering what’s wrong with them
dha> do :P
Establish the production of Scorpions or Turbo2+ :).
Hello, icebear
ice> У буржуев просто P частенько для PLCC стоит, вот и подумалось.
44A 44-lead, Thin (1.0 mm) Plastic Gull Wing Quad Flat Package (TQFP)
40P6 40-lead, 0.600Ф Wide, Plastic Dual Inline Package (PDIP)
44J 44-lead, Plastic J-Leaded Chip Carrier (PLCC)
44M1 44-pad, 7 x 7 x 1.0 mm body, lead pitch 0.50 mm, Micro Lead Frame Package
(MLF)
Hello icebear
ice> Does ms have legs on two or four sides? If from four and bent under
ice> housing - PLCC.
From two, it means not PLCC. Thanks for the educational program.
Hello, Evgeny Muchkin
Evg> I wish I knew what PLCC is ;)
Does Ms. have legs on two or four sides? If from four and bent under the body -
P.L.C.C.
Hello, CHRV
CHR> Nope, it looks like a DIP made by Integral!
CHR> http://www.bms.by/products/russian_2002/dram.htm
Hmm, “hull type 2103.16-17” is cool! So that the enemies don't guess :)
bourgeois simply P often stands for PLCC, so I thought.
Hello icebear
ice> Will do. "P" - are they by chance not in PLCC housing?
I wish I knew what PLCC is ;)
Hello, Evgeny Muchkin
Meaning, I re-soldered everything anew - while I installed the microcircuits on the sockets, in
In the end, this is the picture we got.
Can you tell what's wrong with it?
File: screen.JPG http://zx.pk.ru/attachment.php?attachmentid=3466
Hello, The Exploited
The> oh, did we ever think that we would help repair each other's specs
The> based on internet photos taken with a digital camera...
The>
This TV Tuner gives the picture :)
Well, let's get into some exercises with the tester. There should be volts on the tires
approximately?
PS; Very; grateful for the help!!!
Hello, Evgeny Muchkin
Evg> Well, let's get into the exercises with the tester. There should be volts on the tires
Evg> be approximately?
Yes, it’s about the same everywhere, with the exception of A14/A15
Hello, Evgeny Muchkin
oh, did we ever think that we would help repair each other’s specs using internet
photos taken digitally...
on the topic - it’s unlikely that anything useful can be said...
rip out, ROM, percent and look at the SD and SHA with a tester, as already written here a couple of pages
back
Hello, Evgeny Muchkin
Evg> in the end this is the picture we got.
Evg>
Evg> Can you use it to determine what is faulty?
z80 is not inserted into the socket?
Hello, Evgeny Muchkin
Evg> Meaning, I re-soldered everything anew - for now I installed the microcircuits
Evg> panels, in the end this is the picture we got.
Evg>
Evg> Can you use it to determine what is faulty?
This picture appears when the power is turned on - I don’t know why, but when
I was at Apogee, so this happened in RU5. The point is that the blocks alternate FFh
(light squares) and 00h (dark squares). Your memory is fine - otherwise
there would be stripes (there wasn’t such a monolithic picture). This may happen
if nothing is written to memory. Look at the WE/ signal.
Hello Orionsoft
Ori> z80 is not inserted into the socket?
If inserted, then when you first turn it on, the picture is exactly like this. If after this
If you press reset, more garbage appears on the screen.
If it is not inserted, then, accordingly, the picture is always such a checkerboard pattern.
Hello, Evgeny Muchkin
Well, I looked through everything and tried it on.
There are no sticks, shorts or breaks. All the legs of RU7 reach the right places.
But still the picture is “chess”.
I noticed very few volts on pin 2 D21 - 0.14V (on the processor socket
(pin 14) is the same), and on the rest - 4.96V on the same 2nd pin. This is fine? (percent, rom, vg, ay pulled out).
I'm just almost in despair :(
Hello, The Exploited
p.s. - finding a malfunction is half the way to eliminating it.
To find a stick only with a tester, this method also helps - measure
voltage on the neighboring paths passing next to the glitchy one - further look at
wiring..
Hello, Evgeny Muchkin
on all D0-D7 approximately the same, i.e. without Z80 close to 5v (see also
resistor assembly on the SD)
Hello, Evgeny Muchkin
that's the point - look for sticky parts all over the board, or maybe a piece of solder somewhere
fuse (this also happened often).
The 0th bit of your SD is shorted to something. By the way, these 0.14V without the corresponding ru7?
Hello, Evgeny Muchkin
Evg> There are TM9 - D49 on the board, I went through it with a tester and found that
Evg> 3 and 12 legs are in the short
This is exactly how it shouldn’t be! Of course, at D0 0.14v (and it should be
5v)! Either there is snot somewhere, or the small circuit is dead.
Hello, molodcov_alex
1. I discovered that my Strobe and D0 are shorted somewhere.
2. It looks like there is an error in the diagram, namely: drawn on D49, contact 10 is
strobe, and 12 is Bank; although, in fact, it’s the other way around - 10 is Bank, and 12 is Strobe.
Please check it yourself.
3. Unsoldered the true strobe (leg 12 D49) from the board to understand in the chip
shorty or on the board, and OH MIRACLE! COMPUTER STARTED!!! :eek; :v2_clapp:;
4. True, the disk drive doesn’t load anything - it wobbles with its head and says an error. :(
5. I hope that the D49 chip is intact (since I don’t have any short circuits in legs 3 and 12)
discovered). I'll try to find some sniffles.
Questions:
1. As I understand, the strobe signal is branded D49. Is this true?
2. Is the strobe used by the disk system, and what else is it used on the board?
Thanks in advance!
Hello, The Exploited
Question. The board has TM9 - D49, I went through it with a tester and found that 3
and 12 legs are in the shorty. For those who don't mind, please look, this is how it should be
or not.
Hello, The Exploited
The> by the way, these 0.14V without the corresponding ru7?
WITHOUT and with her too, so the jump should be correct, 0.14 or almost 5 (I
I'm leaning towards the first)?
Hello, Evgeny Muchkin
Ok! :) I removed the stick, but I didn’t understand where it was, just between
I cleaned the tracks and the computer works.
But another problem arose - the drive never came to life :( It won’t read, even if it hurt you
:( although the light blinks and the head moves properly. I tried to cut
track on the PLL IC, but did not get any effect :(
12V is supplied to the VG, which means that the protective transistor seems to be in order.
VG died, what do you think?
Hello, The Exploited
!!YES!! :v2_clapp;
Torment; with my board ended with a complete and unconditional victory over me
with your support! Thank you all so much for your help and advice, thanks to which
I did not give up, which, as it turned out, are a little hooked: v2_finge; (4;
cliff, and no less sticky ;))
The last study was to replace the faulty D63 - 555TM9 with a 1533TM9. The most
It’s cool that the new microcircuit doesn’t heat up at all, unlike the previous one,
which, even in working condition, could light a cigarette.
Thanks again everyone, and fewer malfunctions!