NEWDOS/80 v2 disassembly

Project goal

The goal of the project is to learn more on the internal structure of NEWDOS related operating systems. With this knowledge we hope to be able to add support for modern additions to the TRS-80 Z80 based computers (Model I, III, 4 ...)

The latest approach is to create a native disassembly with Mysosys DSMBLR. The printer format contains more information and takes care of the loader format. The standard format can be used for reassembly. Not yet all disassemblies are converted to this format.

Resources (local)

• NEWDOS/80v2.0 complete image, SYS0/SYS isolated, code binary and disassemblies,
• Record splitter and header stripper in perl,
• Thin wrapper arount the CPU::Z80::Disassembler,
• Disassembly of SYS0/SYS (work in progress),
• complete SYS0.SYS assembly with comments from Das DOS Buch for z80pack/z8asm,
• Disassembly of BOOT/SYS copied from the hackers guide and updated comments,
• A BOOT.ASM for NEWDOS/80 v2.5 only needed if the ROM can boot directly from harddisk. See trs80.nl for more information,
• scanned and text version of the TRS-80 HACKER'S HANDBOOK FOR NEWDOS/80 by KEVIN O'HARE,
• TRSDOS 2.3 Decoded and Other Mysteries. ,
• Collected RST 0x28 calls with interpretation (from SYS0/SYS for now),
• Chapter 3 of "The DOS Book" containing the disassembled code of SYS0/SYS for the Model 1. Comments in German.

Resources (elsewhere)

• Level II ROMs 1st Ed - Tab Books,
• TRS80 FAQ,
• Manual of DDSD/CMD from The Alternate Source

Last updated: 2024-10-20

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