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"upstream.sh" Script To Rebase Changes 5CS PC TODO A Simple NetCat Program ADAM FujiNet Quickstart Guide ADAM Programming ATASCII Printer About Each Printer Accessing the Real Time Clock Active Branches AdamNet Timing Analysis Additional Commands for R: Devices AppKey Registry Page Apple II & III FujiNet Quickstart Guide Apple II FujiNet Platform Reference Guide Apple II SP over SLIP Apple II memleak analysis notes. Apple IIgs Programming Apple Programming Apple2 Test Results ‐ 2025‐08‐26 Apple2 memleak analysis notes. Apple2 AppleII & III FujiNet Quickstart Guide AppleII III FujiNet Quickstart Guide AppleII FujiNet Plaform Reference Guide AppleII FujiNet Quickstart Guide AppleII III FujiNet Quickstart Guide Applesoft Network extensions Apple‐68k: Ideas for Extending the DCD Protocol Application Ideas Atari 1020 Atari 1025 Atari 1027 Atari 1029 Atari 820 Atari 822 Atari 825 Atari BASIC JSON POST Best Practices Atari FujiNet Programming Series: Roman Checkers Atari FujiNet Quickstart Guide Atari Program Recorder (410 1010 XC11 XC12) Atari Programming Atari8 BBS Express 850 1.0 Documentation BBS Express 850 1.0 BBS Baud Rate Test Before Each Test Board Bring Up Hardware Board Bring Up Software Board Bring Up Board bring up for FujiNet Platform.IO code Boot a Game from Fujinet.Online Boot the FujiNet to CONFIG CIO Commands for N Device CIO and FMS copy commands CONFIG HTTP API CONFIG Users Guide CP M Support Carina BBS 2.7 ChatGPT Ruminations on DOS Code Re Org Handling Different Systems Cold Start Profiling Coleco ADAM Tests Color Computer Quickstart Guide Commands for Device $09 (Network) Commands for Device $0F (Fujinet) Commodore 64 Tidying Up Commodore FujiNet Quickstart Guide Complete CLI Guide to Builds Config 2.0 Set WiFi Network Config 2.0 Verify ATR Disk Booting Config 2.0 Verify Host Slot Editing Config 2.0 Verify Joystick Control Config 2.0 Verify Slot Quick Keys Config 2.0 Verify Subdirectory Traversal Config 2.0 Verify Version Config 2.0 Verify XEX Disk Booting Configuration Test Connecting to a BBS Contributing to the Project Copying disk from Internet Creating New Disk Credits DIAGNOSTIC: Alter SIO Timing for T0 DIAGNOSTIC: Alter SIO Timing for T1 DIAGNOSTIC: Alter SIO Timing for T2 DIAGNOSTIC: Alter SIO Timing for T3 DIAGNOSTIC: Alter SIO Timing for T4 DIAGNOSTIC: Alter SIO Timing for T5 DIY FujiNet for the Intellivision DOS XL Cheat Sheet Defoogi Demystified Deploying your Favorite BBS Dev News Developing a Turn Based Multiplayer Server Prototype for Poker Development Atari Development Env for Apps Directory of The Big RunCPM ZIP ESP32 Schematic Epson FX 80 Error Codes for N: Device Example Read Clock on Adam Example Read JSON Data Example TNFS Hosts FEP 001 FEP 002 FEP 003 FEP 004 FOREMDOC FORM2DOC Finding SmartPort Devices Finding The SmartPort Dispatcher Firmware Code Book Blue Firmware Test Plan for Apple II Firmware Test Plan for Apple2 Firmware Versioning FoReM 850 26M FujiCard Hardware Notes FujiNet CLI Flasher FujiNet Commands Reference FujiNet Commodore Programming FujiNet Config Tools FujiNet Configuration File: fnconfig.ini FujiNet Development Guidelines FujiNet Documentation Style Guide FujiNet Documentation Wish List FujiNet Flasher FujiNet Network Protocol Handbook FujiNet Networking (N: Device) Quickstart Guide FujiNet Programming Guide for the Atari 2600 FujiNet Programming Guide for the Bally Astrocade FujiNet Programming Guide for the ColecoVision FujiNet Programming Guide for the Intellivision FujiNet Talking Points for YouTubers, Podcasters, etc. FujiNet VirtualMachine FujiNet for Intellivision FAQ Fujinet Documentation Style Guide Scratch Pad Fujinet Intellivision Mailbox Protocol GRANTIC (screen dump) Git Config Aliases Git History Examples Guide to Building AppleWin on Linux HTML Printer HTTP Collect Headers HTTP Headers HTTP POST HTTP Protocol HTTP Set Channel Mode HTTP Test Harness Hacker List High Score storage for Legacy Games High Score writeable ATR example in BASIC Home How FujiNet Supports Connections to BBS How I added FujiNet Clock support to FoRem 26M Installing a High Score Party Server Intellivision Bring‐up Notes Issuing SmartPort Commands JSON Query Format Known TNFS Hosts Listen Test Load file from HTTP into AtariWriter Loading Binary Files from N: Device Loading PLATOTERM to access IRATA.ONLINE MIDI Maze Notes MIDIMaze MSX Technical Overview MS‐DOS BIOS Specification Mac68k Quickstart Guide N Device Close N Device Get Characters N Device Get Record N Device Open N Device Put Characters N Device Put Record N Device Status N Device Template N: AUX1 Values N: AUX2 Values N: Device Filename Size Limitations N: Game Developer Cheat Sheet N: SIO Command $20 Rename File N: SIO Command $21 Delete File N: SIO Command $25 Point in File N: SIO Command $26 Note in File N: SIO Command $2A Make Directory N: SIO Command $2B Remove Directory N: SIO Command $2C Change Directory N: SIO Command $30 Get Current Directory N: SIO Command $FB Set JSON Parameters N: SIO Command $FC Set Channel Mode N: SIO Command $FD Set Login N: SIO Command $FE Set Password N: SIO Command $FF Query for Special Command DSTATS N: SIO Command 'A' Accept N: SIO Command 'C' Close N: SIO Command 'D' Set UDP Destination N: SIO Command 'E' (get) Error N: SIO Command 'H' Set Hash Type N: SIO Command 'O' Open N: SIO Command 'P' Parse JSON N: SIO Command 'Q' Query JSON N: SIO Command 'R' Read N: SIO Command 'S' Status N: SIO Command 'T' Set Translation N: SIO Command 'W' Write N: SIO Command 'Z' Set PROCEED Timer Rate N: SIO Command 'c' Close Client Connection N: TCP Game Example: Light Cycles N: TCP Game Example: Reversi N: Theory of Operation N: devicespec Nightly Firmware Builds Official Hardware Versions Okimate 10 PC DOS FujiNet Quickstart Guide PLATOTERM Key Charts PR 1108 Atari Testing Procedure PR 1108 Test Plan PiRTO‐II‐Fuji Hardware Notes Printer Emulation Printing Epson Graphics Output from Print Shop Printing Text File to Printer Production Units Protocol libraries Prototype Board Revisions RS232 Quickstart Guide Run FujiNet with Altirra for Atari Run FujiNet with OpenMSX Run FujiNet with Xroar for CoCo S.A.M. Emulation on P4: S100 FujiNet Quickstart Guide SIO Command $4E Network Open SIO Command $53 Network Status SIO Command $64 TCP Disconnect SIO Command $C5 Hash Output SIO Command $C7 Hash Compute SIO Command $C8 Hash Input SIO Command $C9 Base64 Decode Output SIO Command $CA Base64 Decode Length SIO Command $CB Base64 Decode Compute SIO Command $CC Base64 Decode Input SIO Command $CD Base64 Encode Output SIO Command $CE Base64 Encode Length SIO Command $CF Base64 Encode Compute SIO Command $D0 Base64 Encode Input SIO Command $D6 Set Boot Mode SIO Command $D7 Mount All SIO Command $D8 Copy File SIO Command $D9 Enable Disable CONFIG in D1 SIO Command $DA Get Device Slot Filename SIO Command $DB Close App Key SIO Command $DC Open App Key SIO Command $DD Read App Key SIO Command $DE Write App Key SIO Command $DF Set External SIO Clock SIO Command $E0 Get Host Prefix SIO Command $E1 Set Host Prefix SIO Command $E2 Set Filename for Device Slot SIO Command $E3 Set HSIO Index SIO Command $E4 Set Directory Position SIO Command $E5 Get Directory Position SIO Command $E6 Umount Host SIO Command $E7 New Disk SIO Command $E8 Get Adapter Config SIO Command $E9 Unmount Device Image SIO Command $EB Set UART Baudrate SIO Command $F0 Enable UDPStream Mode SIO Command $F1 Write Device Slots SIO Command $F2 Drive Map Read SIO Command $F2 Read Device Slots SIO Command $F3 Write Host Slots SIO Command $F4 TNFS Read Hosts Slots SIO Command $F4 Read Host Slots SIO Command $F5 Close Directory SIO Command $F6 Read Directory SIO Command $F7 Open Directory SIO Command $F8 Mount Device Image SIO Command $F9 Mount Host SIO Command $FA Get WiFi Status SIO Command $FB Set SSID and Connect SIO Command $FC Get Scan Result SIO Command $FD Scan Networks SIO Command $FE Get SSID SIO Command $FF Reset FujiNet SIO Command Page Template SIO Commands for Device ID $70 SIO Commands for Device IDs $71 to $78 Sample FNCONFIG.INI Setting Up TNFS On Windows 10 Setting up TNFS on a Raspberry Pi Setting up a TNFS Server Software Changes for New Platforms SpartaDOS X Ultimate1MB FujiNet Utilities System Quickstarts Testing Plan Testing Results V1.3 ‐ Atari Testing against FTP Server Testing local SD Card Storage The Complete Linux CLI Guide The Complete MacOS CLI Guide The Complete OSX CLI Guide The Definition of Done The Original GoogleDoc Things To Hack On Things to do with FujiNet Toplevel Hardware Toplevel Miscellaneous Toplevel Software Toplevel User Guides Toplevel Virtualization Translation Test Useful External Documentation Using AMAC with FujiNet Using App Keys Using FujiNet from fig FORTH Using FujiNet‐PC‐RS232 with 86Box in Linux Using FujiNet‐PC‐RS232 with MartyPC Using HTTP S from BASIC Using NDEV in Atari DOS 2.0 2.5 Using SAM (Voice Synthesizer) Using the MODEM Sniffer Using the N: Device Using the N: Tools in DOS 2 Using the SD: protocol adapter. Virtual Apple II FujiNet Virtual Apple2 FujiNet Virtual Atari FujiNet Virtual CoCo FujiNet Virtual FujiNet Quickstart Guide What is FujiNet? XIO Commands YAIL Home fnjson.cpp Value Mangling Analysis main hardware main miscellaneous main software main user guide Change This main user guide main virtualization pio 3 x howto pio 6 x howto x test home
N: Device Filename Size Limitations
europlus edited this page 2024-09-23 14:10:40 +10:00
Table of Contents

Not all DOS are Equal

CIO does not care about the size of a device specification; only that there is a buffer large enough to hold the device-spec, and that its length is properly passed to the CIOV call.

The various file management systems (FMS) present in different disk operating systems (DOS) are another matter, entirely. These differing FMSes impose their own unique limitations, and this discrepancy will become very important as a mapping scheme is implemented for file-level operations in the N: device.

Legal Filename Length comparison

DOS Length
DOS 1.0 8.3 1
DOS 2.0 8.3 1
DOS 3.0 8.3 2
DOS 4.0 125
MyDOS 256
SpartaDOS 256 3
OS/A+ 23
DOS XL 23
XDOS 45

Notes

  1. The DUP throws a FILENAME TOO LONG error if this limit is breached.
  2. A combination of explicit input length limiting and over-eager pre-pending of D1: before N: for any KCP operations make this DOS unsuitable for N: usage in the utility package. An external utility will be needed.
  3. For Disk-based SpartaDOS, an implementation of XIO 40 will need to be added so that binary files can be loaded. This is because the binary loader is implemented in the FMS itself, and not the command processor.

Adding to this page

To test a particular DOS:

  1. Load DOS in Altirra
  2. Go into the file management portion of DOS
  3. Hit F8 to enable debugger.
  4. In the debugger window, type .tracecio on Debugger should answer with affirmative message.
  5. Hit F8 to resume the emulation.
  6. Try any file operation, such as a BINARY LOAD, or a COPY, where you are offered to enter a filename.
  7. Look in the debugger window for a GET RECORD operation from E:, this is an opportunity to get input, and write down the length. This will tell you how long the line can be.
  8. Try various filenames, e.g. N:ABCDEFGH.IJK or N:ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890
  9. The OS will return with an error 130. This is fine. Record the Filenames that come back in the debugger window in the corresponding OPEN call, and see how they match.
  10. If the filenames become corrupted after a certain length, try to find the point at which behavior changes, by trying filenames of different lengths.
  11. Once you have a definitive number, come back here and alter the table.
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