Wallpaper #08 31 июля 2000

Железо     Profi

zhelezyaki - The scheme of the complete decoding of ports of extended memory for Profi ..

               3. Zhelezyaki



   From the editor: Many years people have suffered from
simplified decoding port memory. Then spektrumisty our 
extensive, but, alas, the former homeland of the USSR, have 
agreed to software standards around these "pitfalls" beloved 
computer. The present article contains not only the schematics 
that, in general, has long been solved problems, but also 
valuable solutions to minimize the necessary improvements to 
the computer's motherboard. 



(C) Musa Khaibullin


     Scheme of full decoding of ports

     extended memory for Profi ..

              and not only.


  Let's start with a bit of history. Around the summer of 1994 
I had Profi v3.2 with 128 KB of RAM (for 3 in a row computer!,

and I started with a 48-second "Leningrad"). With
128Kb I spent a short time, somewhere before the middle of 
1995, then by changing two lines RU5 on RU7, began to enjoy 
working in 512K mode: chase CP / M and iS-Dos in

Ram disk. Soon, I often noticed that some of the program - 
especially muzykalki very disliked included

512K. Pretty soon it became clear that the authors of these 
same programs are not treated quite correctly :-( to 128 memory 
and musical co-processor, in consequence of that breakdowns 
expansion port for Profi - spontaneously includes an advanced 
screen shut off ROMs, etc.



  In mid-1996 we have in Tashkent
appeared 16 rooms Spectrofon'a, where the "designer" Kirill 
Gromov A very convenient scheme to eliminate these glitches. 
Quick setting her a long time I enjoyed working in

Honey Commader'e with a resident in the memory
;-). Around the same time become
show programs that use the 6 and 7
Port # 7FFD bits of memory
512K. Soon, I imagine it too
set. And faced with the biggest
glitches in the world! If the use
decoding from a standard # 7FFD for this port, then stopped 
working altogether Digital Studio and similar music

editors, though, the authors ensured 99%
compatibility and bug-free operation of the
port. In general, if I had occasionally
(Revised) had shut down
extended memory, then after installation
# 7FFD, it had to do with every fourth
program. Soon after this I'm tired and
this port, I installed the complete decoding.


  After a while my friend, pointed me to some very nice 
features of the port ATM-TURBO 2 + - # FFF7. He could be always 
(!) is included, it did not have to constantly turn off the 
rest Ports of extended memory, and this in no way affects all 
(!) without exception programs. And what is great - supported 
him Honey Commander. Soon the time this port is also my stand. 
When This I had to use so much

small chips, and not just the logic that
looking at my baby I was sick.
Whatever was no longer pay Profyaka,
to hang so much shells I was sorry :-(


  After much deliberation it was decided to drive more than 
half mikruh in RT4'ye, they great economy of space, although 
more consumed. As a result, and there was

The following reduced scheme (from the editors - see shema.txt 
in the appendix) 


   Firmware m / D4 comprises the whole
a bunch of LL1. Therefore, this scheme has its
features - if you include bit on some port, if you please turn 
it off before going to another port expansion.

Although with this you're unlikely to encounter, because
driver hotplug memory test
memory at a time, and if a port
will be found, with the driver and will
work.


   Now I will tell you about some of the features of the port # 
FFF7, for example, to turn a page of memory

need to record a bit "0" instead of "1" as
usual.


   When you set yourself this scheme, the
test it will be using
Test v4.30 by CompoWellcome. In addition to the scheme
improvements in the application are also
firmware chip RT4, respectively: in
D1 - RAS512, in the D4 - 512SMS and D8 -
PRFFF7, which are specified in the scheme and my firmware RF5 
for Profi v3.2 with the Pentagon INT'om and wide border. But 
further, I hope, everything seems to be understood.

If you have any questions, please
my address 2:5085 / 80.07 @ fidonet.org on
the name of Musa Khaybullin aka Star Vision.