DonNews #08 05 июля 1999

Софт

NEOS - NEOS about glitches and more.

(C) Disabler / Omega Hackers Group


                NeOS v1.0

         About the bugs and not only ...


   For those who do not know NeOS - a new
operating system, which, unlike
of IS-DOS, operating entirely through
the driver does not brake! So, with you
Disabler, and I will tell you that I could find
per week working with NeOS.


   NeOS flashing the ROM instead of the Basic 128
or, if Cashe16k, can it,
but will have to put two additional
mikruhi to emulate a ROM (diagram below).


   After pressing the Reset will take you to the menu
NeOS, which have the following items:


                NeOS v1.0

                Tr-Dos 128

                Tr-Dos 1948

                128 Basic

                48 Basic


   The first point - the entrance to NeOS, if
drive is the drive and its accessory
to any disk system will
defined, it will look NeOS file:
"Neosboot.cnp". If the file is found,
it will automatically download and execute.


   The remaining items are not something
new, except that when choosing
128 Basic, you find yourself in the usual 48om
Basic'e open port # 7FFD.


   Externally NeOS bit like Must Die
Operation System (Ms-Dos), but in general the first
seems very nice.


   And now, as the situation a little bit about
Gluck:

   - Here is a small example
sequence of actions:


        1.Vhozhu in NeOS

        2.load sts6_2.c; load STS6.2

        3.exit; get out of NeOS

        4.Vhozhu in NeOS


   Effect - Startup and Running sts6_2.c

- In the NeOS a built-in driver
work with is-dos'om, but the authors do not
take into account one thing: buffer to disk
operations = 512bayt from the address # 5B00; with
Address # 5D00 is located different
variables, while reading the sector is-dos
disk (by the way his length = 1024bayta)
is mashing variables, and how
result (at best) reset.


   - Do not read length <= 256bayt.
Rather they are read into the buffer, but not
being transferred to memory.


   - On command "Ram" is not switched
Memory (Ram always = 7).


   - In ROM BASIC 91-year, sometimes
does not work out in BASIC.


   - If you go to a non-existent drive
such as "Drive D", the system hangs a bit
absolutely.:)


   In general, despite all this I NeOS
liked, and I will be happy in every way
to support authors, in the sense of writing
programs under NeOS.


   Yes, I almost forgot to draw shemku.
Its essence lies in the fact that Cashe
switched on and off not reading from
Port # FB / # 7B, a set / reset bits
# 04 Port # 7FFD (pereklyuchekiya bit ROM).


                15

                  ■ DE k555

                 1
 \ Select \ A / B kp11 4

                 2 Y0 \ new_d \
 \ Bit4_fd \ = 1 ■ A0

                 5
 \ Sel_fd \ = 1 ■ A1 7

                 3 Y1 \ new_c \
 \ Old_d \ B0

                 6
 \ Old_c \ B1



    What's on where to take and where to apply?


   It's pretty simple! This revision
is designed to withstand the scheme V.M.G. for
Connection Cashe.


   Select - Switch mode enable
and off the cashe, +5 - standard,
land - Emulation ROM with basic 128.


   bit4_fd - you can take the 27th leg ROM
if you have two ROMs, one with a tr-dos, and
create own with BASIC, or exit
12 Products TM9 (usually it is this
used as a port # FD).


   sel_fd - foot-9 of the same TM9.


   old_d, old_c. Cut off from TM2 in Scheme
cashe legs 2 and 3, respectively. What
had passed on them, and there are signals of old.


   new_d, new_c. After cutting the legs from
TM2 own leg stump and would these
signals.


   Another reported that the signals and bit4_fd
sel_fd must be inverted, with
assistance, for example, LN1.


   Here, perhaps, and all I can say
on this issue. By the way, if someone
is soft under NeOS, contact addresses
Editorial.