On-Line #44 07 июля 1996

Доработки     Profi     Scorpion ZS     Железо

Mosaic - Additional memory for computers Profi & Scorpion.

                 MOSAIC


(C) OLDMAN


   In recent years, the program began to appear that use
additional memory PENTAGON 512. This is good ... But now users 
of other "256", "512" and "1024" feel left out. And how it 
would be cool - an assembler, which allows free use of 
"standard" 128k, or debugger, hidden far away, so it is not 
found! I too am not talking about Commander! One gets the 
impression that the developers of software under PENTAGON 512 
just do not have information on other machines. Let's try to 
help them. 


   In fact, all machines are made in different ways (a valuable 
idea ...), but there are also common: extra pages of memory are 
connected through a separate port, and segments of the pages - 
standard, port # 7FFD, so installation is a specific computer

by changing two bytes.

         SCORPION - layout bit port # 1FFD

D0 - disables ROM and projects in its place the 0-th segment (*)
D1 - no matter ... (**)
D2 - (**)
D3 - (**)
D4 - "1" includes an additional page of memory with # C000
D5 - (**)
D6 - (**)
D7 - (**)

        PROFI - layout bit port # DFFD

D0 \
D1 - a number from 0 to 7 includes the relevant pages
D2 / memory (***)
D3 - choose windows projecting segments: "0" - # C000-# FFFF,

     "1" - # 4000 - # 7FFF (actually, it's too "(**)", but 
suddenly on      need the ...)

D4 - disables ROM and projects in its place the 0-th segment (*)
D5 - blocks the operation of the controller of the TR-DOS ROM 
and allows pa      bot with the ports of the controller RAM. 
("(**)"?) D6 - **

D7 - **


   Notes:


  * - Projects and does not connect, so all the changes 
contained       zhimogo 0-th segment will be reflected at the 
following addresses # 0000       # 3FFF (as, indeed, and vice 
versa). 

 ** - Actually, of course important, but ... only to owners of 
concentration       concrete machines. These bits are or are 
not used or operated 

      external peripherals and various bells and whistles such 
as screen 

      high-resolution monitor or shadow. Unify

      All this is complicated ... I advise them just to null.

*** - If SCORPION'e only one additional page PA
      myati (at least not yet), then there may be PROFI

      any number (up to 7). And they may be involved

      discordantly, for example, PROFI 512 with additional pages
      mi 1, 2 and 7 ... Therefore, if you want to use the entire

      additional memory specific PROFI, scan all

      seven possible pages and use the present.

              Segment table


              00 01 02 03 04 05 06 07

         C 00 00 01 02 03 04 05 06 07
         T 1 August 2009 0A 0B 0C 0D 0E 0F
         P 02 10 11 12 13 14 15 16 17
         A March 18, 1919 1A 1B 1C 1D 1E 1F
         N 04 20 21 22 23 24 25 26 27
         And May 28, 1929 2A 2B 2C 2D 2E 2F
         C 06 30 31 32 33 34 35 36 37
         Since July 1938 39 3A 3B 3C 3D 3E 3F



   Here the columns are switched port # 7FFD, a line - # 1FFD
for Scorpion or # DFFD for PROFI. Naturally, all segments can 
be used with only PROFI 1MB (a little reklamka ...). Do not 
think that I do not know about the existence of KAY, ATM, 
ALLEGRO, etc. .. On the existence of something, I know ... 

                        Dmitry (OLDMAN)
                    MDM 496-8508; 12:00 / 21:00
                     E-mail: zxnet@mastak.msk.su
                        dmitry_g@deol.ru
                      ZXNet: 095/100.1