Initial commit

ioports.inc

@@ -0,0 +1,94 @@
+; ===================================================
+; Orion-128 computer
+; System I/O ports
+;
+; Disassembled by Romychs @ 2026-10-08
+; ===================================================
+
+
+; System port mapped to RAM address.
+PORT_F400_KBD  EQU 0xf400
+
+; System port mapped to RAM address.
+PORT_F401_KBD  EQU 0xf401
+
+; System port mapped to RAM address.
+PORT_F402_KBD  EQU 0xf402
+
+; System port mapped to RAM address.
+PORT_F500_USR1 EQU 0xf500
+
+; System port mapped to RAM address.
+PORT_F600_USR2 EQU 0xf600
+
+; System port mapped to RAM address.
+PORT_F601_USR2 EQU 0xf601
+
+; System port mapped to RAM address.
+PORT_F602_USR2 EQU 0xf602
+
+; System port mapped to RAM address.
+PORT_F603_USR2 EQU 0xf603
+
+; System port mapped to RAM address.
+; VG93 State/Command
+FDC_F700_STATE EQU 0xf700
+
+; System port mapped to RAM address.
+; VG93 Track number
+FDC_F701_TRACK EQU 0xf701
+
+; System port mapped to RAM address.
+; VG93 Sector number
+FDC_F702_SECTOR EQU 0xf702
+
+; System port mapped to RAM address.
+; VG93 read/write data from floppy
+FDC_F703_DATA  EQU 0xf703
+
+; System port mapped to RAM address.
+FDC_F704_REQ   EQU 0xf704
+
+; System port mapped to RAM address.
+; Select floppy disk side
+FDC_F708_SIDE  EQU 0xf708
+
+
+; Write only system port mapped to RAM address.
+; Set video mode. 
+;    bit 0 - palette 0-1, 1-2; 
+;    bit 1 - color count 0 - 16 colors, 1 - 4 colors; 
+;    bit 2 - 0-mono, 1-color;
+PORT_SYS1   EQU 0xF800
+
+
+; Write only system port mapped to RAM address.
+; Set active RAM page
+; bits D[3:0] - page number
+PORT_SYS2   EQU 0xf900
+
+; Write only system port mapped to RAM address.
+; Switch Screen
+; bits D[1:0] - screen number; 
+; bit  D6 - RAM Refresh;
+; bit  D7 - 12k/16k (384px/512px screen width)
+PORT_SYS3   EQU 0xfa00
+
+; Write only system port mapped to RAM address.
+PORT_SYS4   EQU 0xfb00
+
+; ===================================================
+; I/O Ports
+; ===================================================
+
+; Set active RAM page
+; bits D[3:0] - page number
+P_SW_MEM    EQU 0xf9
+
+; Switch screen RAM window
+; D1 D0
+;  0  0 — screen 1 (0xС000—0xEFFF)
+;  0  1 — screen 2 (0x8000—0xAFFF)
+;  1  0 — screen 3 (0x4000—0x6FFF)
+;  1  1 — screen 4 (0x0000—0x2FFF)
+P_SW_SCR   EQU 0xfa