draft sources

ordos.inc

@@ -0,0 +1,73 @@
+; ==================================================
+; Orion-128 computer
+;
+; ORDOS (Orion-DOS) System calls
+; Disassembled by Romychs @ 2026-10-08
+; ==================================================
+
+; ORDOS Write max disk size
+ORD_WMAX    EQU 0xbfc4
+
+; ORDOS Read file attributes
+; Out: HL -> file address in memory,
+;      DE - file size,
+;      BC -> directory address after search
+ORD_ATFM    EQU 0xbfc7
+
+; ORDOS Write start/end address of file buffer in RAM
+ORD_WATF    EQU 0xbfca
+
+; ORDOS Read address of file buffer in RAM
+ORD_ATF     EQU 0xbfcd
+
+; ORDOS Set address of filename buffer
+;  Inp: HL -> filename
+ORD_SDNA    EQU 0xbfd0
+
+; ORDOS Read address of filename buffer
+ORD_LDMA    EQU 0xbfd3
+
+; ORDOS Set current drive
+;  Inp: A - 'A' or 'B' drive letter
+ORD_WND     EQU 0xbfd6
+
+
+; ORDOS Read byte from disk
+;  Inp: HL -address.
+;  Out: A - byte from disk
+ORD_RDISK   EQU 0xbfdc
+
+; ORDOS Write byte to disk
+;  Inp: HL -address,
+;       A - byte to write
+ORD_WDISK   EQU 0xbfdf
+
+ORD_STOP    EQU 0xbfe2
+
+; ORDOS Search file on disk
+;  Inp: Filename will be set before call
+;  Out: A = 0 - not found, 0xff - found
+;       HL -> stop byte if not found, of file header if found
+ORD_PSCF    EQU 0xbfe5
+
+; ORDOS Read current disk name
+ORD_RND     EQU 0xbfe9
+
+; ORDOS Erase disk file
+ORD_ERAS    EQU 0xbfee
+
+; ORDOS Open sequential file for read
+ORD_OFILL   EQU 0xbff1
+
+; ORDOS Close sequential file
+ODR_CFILL   EQU 0xbff3
+
+; ORDOS Write file on disk
+ORD_WFILE   EQU 0xbff7
+
+; ORDOS Read file from disk
+;  Out: A = 0 - ok, 1 - file not found, 0x80 - COM file
+;       HL -> start address of buffer
+;       SP+2 -> return to OS address
+ORD_RFILE   EQU 0xbffa
+