Optron #06 09 января 1998

Железо

Letters from readers - SunLion about the newspaper. Pseudo-ROM.

             Letters from readers



yl thoughts
and wishes.

  Reading out of town newspapers and magazines, I
thought: "Unfortunately, in Lviv, no newspapers." AND
Here she appeared - their own, dear,
Lviv. Links I liked: interesting articles, good and beautiful 
Mouzon chart (though the first two rooms had a lot of mistakes, 
but in subsequent issues their supposedly diminished).


  I would like to see in "OPTRON'e" section, describing would 
be about where You can buy good at affordable price

"Garbage" such as floppy disks (they are always lacking)
disk drives, monitors, etc. It would also be
nepoloho see the section on software updates,
appeared in Lviv. Two more requests:
1) How to make pseudo-ROM (I myself did on
scheme, published in the SPF 17, but there
only 2KB, and it is not enough) 2) as the owner
MIKO-BEST'a, I would like to know how to switch it to 256 pages 
of memory. 

  My letter ended. Apologize in advance if it turned out not 
very literary. Good na-na! 


               Regards Paul Makovsky

                        or simply SunLion

                                  13.12.97



              Our comment



  Thank you, Paul, for his kind words addressed
our newspaper, it is nice that the readers believe "Optron" of 
his newspaper - because it is for them we work. I admit that 
mistakes in the first issues were many, but it is associated 
with, say, technical difficulties;), is now trying to reduce 
the percentage typos in the text.


  Over new entries, we accept your
request into consideration. While I can only advise often go to 
radiobazar - if properly search and there you can find anything 
and besides write latest issue of "OPTRON;).


  Now your questions on the hardware.


  1. Pseudo-ROM.


  Omit the option 8K, go straight to
16K. First you need to buy at radiobazare
two chips of type 6264 (domestic
537RU17 analog), one and one LN1 LL1. Now take both 6264 and 
combine all of their conclusions, but the 20's, and Seal, this 
"sandwich" into place PN10 (I believe that PN10 was you instead 
of p ^ 2 on the board SoundDrive'Covox'ZXLprint Sergey 
Filimonov), Seal is not just so, and offset - the third sheath 
in the first hole on the board, the fourth - the second, etc. 
22-th and 20-foot "sandwich" is not sealed in charge

in general. For 1, 2, 27 and 28 feet of holes is not
enough, but it's not scary - signals summarize postings. If 
they interfere with resistors, then vypayay them and sealed the 
bottom. Now summarize additional signals: A11 - 23

(Pre-cut off from the +5 V), A12 - 2
/ WR - 27, +5 V - 28, 26. On 22 th leg of the "sandwich" 
signals from 6 feet LP8. AND finally collect a small sample of 
the desired crystal shemku: 



   A13 1 O 2 4 6 January 1920 foot RU17.1

                  5


 / MREQ 1 1 3 9 1 8 20 foot RU17.2
 LP8.6 2 A13 1910



  More from Sergey Filimonov was an idea rather than
6264 to use one of two 62,256, but this
chip over difitsitnaya and also
as much as 16K will be wasted (there is no standard to use 
them). 

  What would be easier to understand, quote
Pin numbers chips 537RU17: A0-A12:
10-3, 25, 24, 21, 23, 2; D0-D7: 11-13,
15-19; / WR: 1927; / CS1: 1920; CS2: 26; / OE:
22.


  2.Pamyat Miko-Best.


  On the computer, Miko-Best stuff now
prepares Walker, wait for him in the seventh room, there will 
be able to find answers to questions on this computer.


  That's all the answers to all questions. Waiting
new letters from our readers.



                   P.S.



  A few words from Sergey Filimonov. Firstly, with regard to 
errors in the first two issues of "Optron" I can say that these 
newspaper had not been properly tested for the subject of 
grammar, style, punctuation ... Secondly, with regard to 
additional memory, I plan to issue cards Soud Drive'a with 
sockets for 28 conclusions reconstituted under the RAM 62256 
(32K). If you not "burn" a little wait.




                  P.P.S.



  This is just the first letter of our readers with specific 
questions and suggestions. Active, gentlemen, active! Ask and 
try to answer all your questions. We have nothing to hide, 
waiting for the same and from you.



                            Hacker rasp.