[color=blue][b][u]5.0  #1FFD(%00xxxxxxxxxxxx01) - EXPANSION PORT   .[/u][/b][/color]

  #1FFD     ZX Spectrum +2a,b/+3.        ZX Spectrum +128       , .. -         #7FFD  ,  ,     - .            Scorpion ZS 256, ..   ,         .      #1FFD    ,   "Scorpion ZS 256 Turbo/+"        ZX Spectrum +128.   #1FFD      KAY,        .  ,          .    #1FFD      Xiera,             .

[b]RESET:[/b]   .

[u][b]5.1 WR #1FFD  ZX Spectrum +2a,b/+3,      +3    Xiera.[/b][/u]

ZX Spectrum +2a,b/+3     :
+3 SOS -        SOS48,    .
+3 DOS -  CP/M -    DOS.

[b]D0 #1FFD[/b]         : D0=0   +3 SOS, D0=1   +3 DOS.

[b]D1 #1FFD[/b]    +3 DOS    D2 #1FFD    ,   +3 SOS -  .

[b]D2 #1FFD[/b]    +3 DOS    D1 #1FFD    ,   +3 SOS   A15"ROM Change Adress   A15"      CPU0.

[u]      +3 DOS:[/u]

|[u] D2| D1| CPU0 | CPU1 | CPU2 | CPU3 [/u]|
|[u]_0_|_0_| _ 0 _ | _ 1 _| _ 2 _ | _ 3 _ [/u]|
|[u]_0_|_1_| _ 4 _ | _ 5 _| _ 6 _ | _ 7 _ [/u]|
|[u]_1_|_0_| _ 4 _ | _ 5 _| _ 6 _ | _ 3 _ [/u]|
|[u]_1_|_1_| _ 4 _ | _ 7 _| _ 6 _ | _ 3 _ [/u]|

[u]      +3 SOS:[/u]

|[u]ROM A15|ROM A14[/u]|
|[u]D2#1FFD |D4#7FFD[/u]|
|[u]_ 0 _____|_0 _____[/u]| +3 Editor
|[u]_ 0 _____|_1 _____[/u]| +3 Syntax
|[u]_ 1 _____|_0 _____[/u]| +3 DOS
|[u]_ 1 _____|_1 _____[/u]| +3 SOS

[b]D3 #1FFD[/b] -  +3   - MOTOR:0-off,1-on.

[b]D4 #1FFD[/b] -    STROBE.

[b]D5 #1FFD[/b]  +3  .

[b]D6 #1FFD[/b]  +3  .

[b]D7 #1FFD[/b]  +3  .

[u][b]5.2 WR #1FFD  KAY, Scorpion, Pentagon,      SKAY (KAY&Scorpion), Pentagon  Profi    Xiera.[/b][/u]

[b]D0 #1FFD[/b]  KAY  Scorpion          RAM0   CPU0 (#0000-#3FFF).
[b]D0 #1FFD[/b]     +3    Xiera,    D3 #EFF7           CPU0.         CPU0 #A8F7, #A9F7.     RAM0.       D4 #7FFD, D3 #1FFD.   (64kb)    ROM , : D2, D5, D6 #1FFD -    (32kb),  DO, D1, D5, D6 #EDF7 -   .  ROM   D4, D5, D6, D7 #6AF7 - NMI SHADOW CONFIGURATION PORT 0 (NMI0).       ROM0   6-  ROM .

|[u]D0#1FFD|D3#EFF7 r/wCPU0 MANAGETMENT[/u] -         CPU0
[u]|_0 _____|_0 [/u] - rdROM -   CPU0     
[u]|_0 _____|_1 [/u] - rdROM & wrRAM -   CPU0         
[u]|_1 _____|_0 [/u] - r/wRAM -   CPU0      
[u]|_1 _____|_1 [/u] - rdRAM -   CPU0     

[b]D1 #1FFD[/b]  Scorpion,           +3    Xiera   D1=1    CPU0       (ROM2  Scorpion, ROM0      Xiera).

[b]D2 #1FFD[/b]  Scorpion  ,  KAY -   :      D2=0/1 - Turbo on/off,      SLCTIN.
[b]D2, D5, D6 #1FFD[/b]     Xiera         RESROM,     ,     512kb. D2   A16" RESROM.                CPU.

[b]D3 #1FFD[/b]  Scorpion      TxD   RS232,  KAY,        +3    Xiera           CPU0 - A15"ROM Change Adress -  A15"      CPU0.

[b]D4 #1FFD[/b]  KAY  Scorpion - A17'RAM,   SKAY    Xiera,    Xiera  A18'RAM        CPU3.
[b]D4 #1FFD[/b]   Pentagon    Ximera  A20'RAM   A20'      CPU3.
[b]D4 #1FFD[/b]   Profi    Ximera  A20'RAM   A20'      CPU3.

[b]D5 #1FFD[/b]  KAY  Scorpion      STROBE.     Xiera       A17"     RESROM.

[b]D6 #1FFD[/b]  KAY    /Q6 LPTBus,  Scorpion  .     Xiera       A18"     RESROM.

[b]D7 #1FFD[/b]  Scorpion   ,  KAY - A19'RAM,   SKAY    Xiera,    Xiera - A19'RAM   A19'      CPU3.
[b]D7 #1FFD[/b]   Pentagon    Ximera  A21'RAM   A21'      CPU3.