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| CP/M | MEMDISK | IDEDOS |
| extension | origin | operation | description |
|---|---|---|---|
| $B | old | run | Hobeta TR-DOS file - BASIC |
| $C | old | - | Hobeta TR-DOS file - CODE |
| $T | old | - | Hobeta TR-DOS file - text |
| $W | old | - | Hobeta TR-DOS file - text |
| ACH | old | - | snapshot file (???) |
| BA2 | new | - | BASIC program, allows TOS A.2 instructions header (0,len,start,prog,line) for all BASIC programs |
| BD1 | new | - | BASIC program, allows DISCiPLE/+D instructions |
| BI1 | new | - | BASIC program, allows Interface 1 instructions |
| BLK | old | data | tape simulation for Sinclair 2.0 emulator, see TAP.RZX |
| BJR | new | - | BASIC program, allows ELWRO 800 Junior instructions, see ".PRG" |
| BMP | other | - | picture file |
| BZX | new | load | BASIC program with simple disk instructions, see BZX.RZX |
| COD | old | - | like ".CZX", but with 17B tape compatibile header |
| COM | other | - | CP/M program |
| CZX | new | data, screen | CODE file header (3,len,start,#FFFF,#FFFF) |
| DAT | old | - | binary file without header |
| DSK | old | - | diskimage of ZX+3 or SAM or ??? |
| DZX | new | data | numeric or string array header (1,len,start,name,#FFFF) header (2,len,start,name,#FFFF) |
| FDI | old | - | TR-DOS diskimage |
| GIF | other | - | picture file |
| GRP | other | - | picture file (from MSX), multicolor mode |
| GZX | new | data, screen | GENS3 source file |
| HC | new | - | HiSoft C source file |
| HP | new | - | HiSoft Pascal (HP4S, HP4T) source file |
| HRS | old | - | hires laced (512?384) screen |
| IFF | other | - | picture file |
| JPG | other | - | picture file |
| MDR | old | - | Microdrive media image (see "Z80" emulator description) |
| MLT | old | - | multicolor screen data (used by MB-02)??? |
| NEL | old | - | NeOS library |
| NEX | old | - | NeOS program |
| PCX | other | - | picture file |
| PRG | old | - | like ".BJR", but with 17B tape compatibile header |
| PTX | old | - | Prometheus assembler surce code |
| RAW | old | data, screen | see ".CZX", usually 48kB from #4000 |
| ROM | other | data, screen | contents for ROM chips; no header, length always is multiply of 128B |
| RZX | new | - | Resident System Extension of ZXVGS header (14,len,start,codelen,rsxflags) |
| SCL | old | run | store archive of TR-DOS files |
| SCR | old | data, screen | screen file without header (direct screen memory contents) |
| SEM | old | - | snapshot file (???) |
| SIT | old | - | snapshot file (???) |
| SLT | old | - | snapshot file (with levels loaded via #ED #FB opcode), see SLT.RZX |
| SNA | old | - | snapshot file, see SNA.RZX |
| SNX | old | - | snapshot file (???) |
| SP | old | - | snapshot file for "ZX Spectrum" emulator, see SP.RZX |
| SPC | old | - | tape simulation (???) |
| SV? | new | - | state of game or configuration with user description; usually "SV0".."SV9" and "SV@" for high scores header (13,len,start,namelen,restlen) |
| SZX | new | data, screen | screen file (includes screen mode) |
| TAP | old | data | tape simulation (see "Z80" emulator description) |
| TRD | old | - | TR-DOS diskimage |
| TXT | other | - | text files (the RSX can convert line separators) |
| TZX | old | - | tape simulation (see "X128" emulator description) |
| UDG | new | data, screen | UDG patterns header (3, #00A8,start,#FFFF,#FFFF) |
| VFL | new | - | ZXVGS icons for files in current directory |
| VGS | new | - | ZXVGS program (ZXVGSC3+ compression), except "VGS.VGS" name |
| VOC | other | - | tape simulation (see "X128" emulator description) |
| Vnn | new | - | ZXVGS program or overlay, ZXVGSC1 or ZXVGSC2 compression; nn=00..99 |
| ZX | old | - | snapshot file 49486B for KGB emulator |
| Z80 | old | run, screen | snapshot file (see "Z80" emulator description) |
| ZX8 | old | - | snapshot file (Specculator'97), ".ZX82" suffix in fact |
| ZXS | old | - | ZX32 emulator file |
| ZXT | new | - | text file (line separator ^M, end of file: ^@) |
Structure of files "*.BZX", "*.CZX", "*.DZX", is the same. Also files "*.GZX", "*.HC", "*.HP".
Two byte numbers in headers (start, len, prog) are in L, H order. This doesn't refer compressed files.