TinyDOS 8088 v0.4 (c) 2026 Berrry Computer. 640K ought to be enough.Full 8088 instruction set loaded. 256 opcodes, every cycle counted.C:\>
| 00h | Program terminate | 1.0+ | ✓ |
| 01h | Character input | 1.0+ | ✓ |
| 02h | Character output | 1.0+ | ✓ |
| 03h | Auxiliary input | 1.0+ | stub |
| 04h | Auxiliary output | 1.0+ | stub |
| 05h | Printer output | 1.0+ | stub |
| 06h | Direct console I/O | 1.0+ | ✓ |
| 07h | Direct console input without echo | 1.0+ | ✓ |
| 08h | Console input without echo | 1.0+ | ✓ |
| 09h | Display string | 1.0+ | ✓ |
| 0Ah | Buffered keyboard input | 1.0+ | ✓ |
| 0Bh | Get input status | 1.0+ | ✓ |
| 0Ch | Flush input buffer and input | 1.0+ | ✓ |
| 0Dh | Disk reset | 1.0+ | ✓ |
| 0Eh | Set default drive | 1.0+ | ✓ |
| 0Fh | Open file | 1.0+ | ✓ |
| 10h | Close file | 1.0+ | ✓ |
| 11h | Find first file | 1.0+ | ✓ |
| 12h | Find next file | 1.0+ | ✓ |
| 13h | Delete file | 1.0+ | ✓ |
| 14h | Sequential read | 1.0+ | ✓ |
| 15h | Sequential write | 1.0+ | ✓ |
| 16h | Create or truncate file | 1.0+ | ✓ |
| 17h | Rename file | 1.0+ | ✓ |
| 18h | Reserved | 1.0+ | — |
| 19h | Get default drive | 1.0+ | ✓ |
| 1Ah | Set disk transfer address | 1.0+ | ✓ |
| 1Bh | Get allocation info for default drive | 1.0+ | ✓ |
| 1Ch | Get allocation info for specified drive | 1.0+ | ✓ |
| 1Dh | Reserved | 1.0+ | — |
| 1Eh | Reserved | 1.0+ | — |
| 1Fh | Get disk parameter block for default drive | 1.0+ | ✓ |
| 20h | Reserved | 1.0+ | — |
| 21h | Random read | 1.0+ | ✓ |
| 22h | Random write | 1.0+ | ✓ |
| 23h | Get file size in records | 1.0+ | ✓ |
| 24h | Set random record number | 1.0+ | ✓ |
| 25h | Set interrupt vector | 1.0+ | ✓ |
| 26h | Create PSP | 1.0+ | ✓ |
| 27h | Random block read | 1.0+ | ✓ |
| 28h | Random block write | 1.0+ | ✓ |
| 29h | Parse filename | 1.0+ | ✓ |
| 2Ah | Get date | 1.0+ | ✓ |
| 2Bh | Set date | 1.0+ | ✓ |
| 2Ch | Get time | 1.0+ | ✓ |
| 2Dh | Set time | 1.0+ | ✓ |
| 2Eh | Set verify flag | 1.0+ | ✓ |
| 2Fh | Get disk transfer address | 2.0+ | ✓ |
| 30h | Get DOS version | 2.0+ | ✓ |
| 31h | Terminate and stay resident | 2.0+ | ✓ |
| 32h | Get disk parameter block for specified drive | 2.0+ | ✓ |
| 33h | Get or set Ctrl-Break | 2.0+ | ✓ |
| 34h | Get InDOS flag pointer | 2.0+ | ✓ |
| 35h | Get interrupt vector | 2.0+ | ✓ |
| 36h | Get free disk space | 2.0+ | ✓ |
| 37h | Get or set switch character | 2.0+ | ✓ |
| 38h | Get or set country info | 2.0+ | ✓ |
| 39h | Create subdirectory | 2.0+ | ✓ |
| 3Ah | Remove subdirectory | 2.0+ | ✓ |
| 3Bh | Change current directory | 2.0+ | ✓ |
| 3Ch | Create or truncate file | 2.0+ | ✓ |
| 3Dh | Open file | 2.0+ | ✓ |
| 3Eh | Close file | 2.0+ | ✓ |
| 3Fh | Read file or device | 2.0+ | ✓ |
| 40h | Write file or device | 2.0+ | ✓ |
| 41h | Delete file | 2.0+ | ✓ |
| 42h | Move file pointer | 2.0+ | ✓ |
| 43h | Get or set file attributes | 2.0+ | ✓ |
| 44h | I/O control for devices | 2.0+ | ✓ |
| 45h | Duplicate handle | 2.0+ | ✓ |
| 46h | Redirect handle | 2.0+ | ✓ |
| 47h | Get current directory | 2.0+ | ✓ |
| 48h | Allocate memory | 2.0+ | ✓ |
| 49h | Release memory | 2.0+ | ✓ |
| 4Ah | Reallocate memory | 2.0+ | ✓ |
| 4Bh | Execute program | 2.0+ | ✓ |
| 4Ch | Terminate with return code | 2.0+ | ✓ |
| 4Dh | Get program return code | 2.0+ | ✓ |
| 4Eh | Find first file | 2.0+ | ✓ |
| 4Fh | Find next file | 2.0+ | ✓ |
| 50h | Set current PSP | 2.0+ | ✓ |
| 51h | Get current PSP | 2.0+ | ✓ |
| 52h | Get DOS internal pointers (SYSVARS) | 2.0+ | ✓ |
| 53h | Create disk parameter block | 2.0+ | ✓ |
| 54h | Get verify flag | 2.0+ | ✓ |
| 55h | Create program PSP | 2.0+ | ✓ |
| 56h | Rename file | 2.0+ | ✓ |
| 57h | Get or set file date and time | 2.0+ | ✓ |
| 58h | Get or set allocation strategy | 2.11+ | ✓ |
| 59h | Get extended error info | 3.0+ | ✓ |
| 5Ah | Create unique file | 3.0+ | ✓ |
| 5Bh | Create new file | 3.0+ | ✓ |
| 5Ch | Lock or unlock file | 3.0+ | ✓ |
| 5Dh | File sharing functions | 3.0+ | ✓ |
| 5Eh | Network functions | 3.0+ | stub |
| 5Fh | Network redirection functions | 3.0+ | stub |
| 60h | Qualify filename | 3.0+ | ✓ |
| 61h | Reserved | 3.0+ | — |
| 62h | Get current PSP | 3.0+ | ✓ |
| 63h | Get DBCS lead byte table pointer | 3.0+ | ✓ |
| 64h | Set wait for external event flag | 3.2+ | ✓ |
| 65h | Get extended country info | 3.3+ | ✓ |
| 66h | Get or set code page | 3.3+ | stub |
| 67h | Set handle count | 3.3+ | ✓ |
| 68h | Commit file | 3.3+ | ✓ |
| 69h | Get or set media id | 4.0+ | ✓ |
| 6Ah | Commit file | 4.0+ | ✓ |
| 6Bh | Reserved | 4.0+ | — |
| 6Ch | Extended open/create file | 4.0+ | ✓ |