OS - A few words about the OS for the Spectrum.

                                        
          Несколько слов об ОС          
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               Demon/DPC                
                                        
   И вновь возвращаюсь к теме ОС, подня-
той в ZXT#11...                         
                                        
   Bce  конечно  хорошо  IDE,  CD-ROM, и
прочие  радости.  Но при установке новой
операционной системы на Спектрум возник-
нет  проблема  наполнения ee программным
обеспечением.  Естественно,  никто  и не
подумает вдруг перелетать на голую ось и
тем  более писать софт под нее. Решением
данной  проблемы  мне  видится  эмуляцияTRDOS disk in upper memory, but for
this will require at least  1 megabyte,
or  512kb with restrictions. Data from the
zom made in KAKH produced by our
unforgettableNEMO. The idea, as I believe,
excellent. Email the disk has already been implemented in pro-
versions of trdos versions 5.12, 5.13F, 5.1ЗFm,
maybe in some others.  But not this
the main thing. It will look like this: load-
press the OS, copy the special. TRD utility or
SCL file by email. disk and start from it.
Cheap and cheerful. You just need to pre-
view the electrical connection. disk for any
battle drive (A,B,C,D - for trdos, for OS
there may be a different designation), since
hang it only on some specific
ny drive is impractical: let's put it on
And - let's cut off the real drive,on the other
goy - we'll lose the ability to load the program
frames rigidly tied to drive A. So
interception should also be carried out by
VG ports, this is all really feasible,
corresponding flashing of the ROM. I hear
dissatisfied cries: "...Y I have no prog-
rammator", etc. It doesn't take long to assemble
(I’ll send the diagram to anyone who needs it), or you can find
where to write it down - these are all the little things, so
Moreover, if you install a new OS, then in any way
I need to flash it into the ROM of the 128th Basik,
no one uses it anyway.           
                                        
 Now we need to focus on the following
question.  Is it worth flashing the OS instead
128 Basika? The answer is definitely positive
ny. OS won't take up space at the bottom
memory that when bChkb available memory
very convenient.  And then the system collapses
impossible.  Of course, you don’t need everything
hard to flash into ROM - only the console,
main drivers and calling table
standard routines. At the same time, it is necessary
so that you can replace the standard
drivers for newer ones, etc.       
                                        
 For example, we have flashed the driver for the upper
her memory under the 128th Spectrum. And here we are
take and expand the memory to1mb! Entries-
go to autoexec.bat (or whatever it is
calling it children, it doesn’t change the essence of the matter)
memory driver installation command 1mb -
and you're done.                               
                                        
And one more plus axis in ROM. A lot already
it was said about the implementation of multitasking -
ness, at least pseudo. About real a lot
it’s not worth mentioning that there’s a problem, because:
firstly, although the Speckrum is a strong machine,
but real multitasking for real
(sorry for the tautology) the tasks are not enough
no.  There are experiments that carry out displacement
understanding multitasking, but the system itself
theme controlling processes devours
main computer time and, in fact,
speaking, the processes themselves do not have enough resources
cypcob.                                 
                                        
 Okay, I digress. In favor of ROM go-
It also says the following. Y I have a nara-
bots performing pseudo-multitasking -
ness.  The system is located in #47 page
memory port #7FFD and is called by
MAGIC.  Everything works great (who
wants to test it - I can send it to
The computer requirements are: trdos versions
5.12, 5.13 and 512 or more kilobytes per
mint), but there is one glitch (well caught
in ZX-Amp'e, when music is playing without a player
era), the program is destroyed,
due to the fact that returning to the program
comes from the system from the zero page -
this memory.  ROM allows you to determine
the desired page and log out
system without crashing the program.              
                                        
 There are also developments in the field OS.
The code is being studied NeOS, I decided
desire to continue the project NeOS v2.0 even without
source codes, author's document found -
tion on NeOS, I will say that it is very, very
not a bad idea, and it’s already real
working.  Only there are no drivers for
msdos, isdos, hdd, cdrom, but that's a question
time.  If someone hassomething about
NeOS - send.  If anyone needs
available information on NeOS, then please contact
to me. High-quality sub-
maintaining the project on the Internet. That's it for now
everything. To be continued...             
                                        
 P.S. My e-mail: demon_zx@fromru.som 
                                        
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 Comments on Demon's article:      
 -----------------------------     
 Denis Tokarczuk             
                                        
 First, I want to express my great
thanks to Dima for his article. Vo-
Secondly, I want to note that set out in
its concepts largely repeat the end-
OS option we are working on (Kille-
din and I). However, there are some places in
material from Dima, with whom you can nocno-
rit.   For example, regarding TR-DOS. It is
allows you to practically emulate the work
TR-DOS commands.Why?  After all, TR-DOS
no matter what - we're flashing the OS onto
place Basic128.  Therefore, I suggest
do so. Before startingtr-dos-pro-
grams,  the system "throws" all its
variables in the upper memory pages,
produces passivization of active and phono-
output tasks (all their variables and themselves are
dachas are also located in the upper countries
memory in the current state), pre-
warns the user thatTR-
A DOS programmay corrupt data in
top pages of memory and, setting
all variables and data BASIC48, "gives
control for him" (one might say, form-
runs in BASIC'e a kind of boot). A
when work with TR-DOS program is completed
Shena, the user presses the usual RESET.
Control is again transferred to the OS, which
in turn checks the condition of the upper
memory pages and "restores" everything
processes.  In my opinion, this is the optimal
way out of the situation.                        
                                        
 If you act on the proposal
Demon's - emulation will only call hecobme-
ctumoctb.                               
                                        
 Now about multitasking. I agree
with the fact that preemptive multitasking
(hereinafter referred to as VM) is an impossible dream. Ky-
Yes, it’s easier to organize a cooperative multi-
state task (hereinafter CM), which allows
lit "switch" from process to pro-
cess.  However, there are interruptions
in which you can post quick
by the speed of the procedure. And this
maybe to some extent even komnehcu-
to indicate the absence of VM.                   
                                        
 I have repeatedly thought about the reality
sion"clipboard" (clipboard, ka-
rmana), allowing you to transfer the same type
transferred data from one program to another.
This will require a pretty decent
a piece of memory (actually a buffer). Yes
There are many ways to get around this “corner”. On-
example, in case of buffer shortage, leaving
place a “bookmark” pointer in one of the pages
belt OS, and when this data (let
it won't sound on Windows :)) they will
"inserted" into another application, not
using cunning manipulations to transfer these data
data "in portions" through the buffer itself. A
Let the buffer size be determined by setup'
om(that is, user settings). 
                                        
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