ID-7000 Emulator

Documentation for emulating the DDE ID-7000 from ROMs.

DDE ID7000

Background

• Background Information
  • Information about DDE
• Known ID-7000s
  • ID-7000 A (virtual)
  • ID-7000 B
  • ID-7000 SPS
    • Slot 1 DDE 7005
    • Slot 2 DDE 7000
    • Slot 4 DDE 7037
    • Slot 5 DDE 7003
    • Slot 7 DDE 7037
    • Slot 11 DDE 7033
    • Slot 13 DDE 7038
    • Slot 15 DDE 7012
• Known software images
• Log book
  • 2024 11 29
  • 2025 03 20
  • 2025 03 25
  • 2026 10 13
  • 2026 10 15
    • emulator read/write callbacks
    • Initialised RAM areas
    • INTx attempts
  • 2026 10 18
  • 2026 10 20
  • 2026 10 24
  • 2026 10 26
  • 2026 10 31
    • Fibonacci
  • 2026 11 01

ID7000 A

• Info/References
• Annotated disassembly (manual)
• Emulators
  • Q1 Emulator base (Kosarev z80)

ID7000 A - Claude

• ‘A’ ROM Analysis
  • Overview
    • Summary of findings
  • The ROM image
  • Memory map (inferred)
  • I/O map (inferred)
  • Interrupt and timer module (FEh/FFh)
  • Interrupt vectors
  • Boot sequence
    • Multitasking
    • Banner and message strings
  • 8251 and 8255 initialisation
    • 8251 initialisation
    • 8255 initialisation
  • Where user input is handled
    • Route of a received byte
    • Indexed I/O tables
    • Special characters
    • Local commands and the Cyber path
    • Local command table (169Eh)
  • The Cyber link
    • What it is
    • Frame format
    • Receive state machine (RST 2, 005Bh)
    • Transmit state machine (RST 4, 020Bh)
    • Replies observed from the emulator
    • Host to user data
    • Link-lost timeout
  • Printing
    • Activation
    • Text format
    • Hardware conditions
    • Searched for and not found
  • Methodology
  • Open questions
  • Appendix: key routine addresses
• Peripheral Initialisation: 8251 and 8255
  • Overview
    • Where the code is
  • 8251 initialisation
    • Common first step: 03h then 53h
    • Mode and command formats used
    • Async channels 0-11
    • Synchronous Cyber link (A0h/A1h)
    • Runtime commands (half duplex)
    • Status bits used
  • 8255 initialisation
    • Printer output (19E1h)
  • Printer stub (printer.py)
    • Wiring modelled
    • Using it
    • Test results
    • Limits
  • Emulator status
  • Open questions
• ‘A’ Emulator Scripts
  • Requirements
  • Files
  • Quick start
  • The demo scripts
    • demo.py
    • demo_cyber.py
    • demo_printer.py
  • Using the emulator from Python
    • The console
    • The Cyber host
    • The printer
  • Reference
  • Configuration
  • Troubleshooting
  • Limits
• Annotated disassembly (Claude)

ID7000 SPS/FUNK

• Info/References

ID7000 SPS/FUNK - Claude

• IPC/1 + SPC/1 Analysis
  • Summary
  • Image layout
  • Memory map (inferred)
  • I/O map (inferred)
  • Interrupt and timer module (FEh/FFh)
  • Interrupts and vectors
  • Boot sequence
  • The kernel (IPC/1)
    • Processes
    • Scheduling
    • API jump table (0040h-00C9h)
    • Writing a process for the P command
  • Console and operator dialog
    • Input handling
    • Menu and commands
    • The C command
    • The D command and the missing debugger
  • The aux link
    • Link layer
    • Message layer
    • Commands
  • The PLC runtime (SPC/1)
    • I/O configuration
    • Main cycle
    • Process images
    • Analog scan
    • Program download and loader
    • Function library (FUNK)
  • Exact sequence to run a downloaded program
  • Open questions
  • Appendix: key addresses
• SPS/FUNK Emulator Scripts
  • Requirements
  • Files
  • Quick start
  • The demo scripts
    • demo_console.py
    • demo_plc.py
    • demo_fib.py
    • demo_fib_plc.py
  • The interactive front end
    • Walk-through 1: the operator menu
    • Walk-through 2: a PLC program
    • Walk-through 3: the Fibonacci process
    • Walk-through 4: the debugger
    • Naming a program and loading a raw image
  • The assembler
  • Using the emulator from Python
    • The console
    • The aux link, digital and analog I/O
  • The self-test
  • Running a loaded program (20h)
  • Troubleshooting
  • Limits
• Annotated disassembly

ROM Comparisons

• ROM Image Comparison
  • Summary
  • At a glance
  • Shared conventions
  • Interrupt assignment
  • The interrupt and timer module in both images
  • Serial devices
  • Port map
  • Memory maps
  • The two host protocols
  • Emulators
  • What the comparison suggests
  • Open questions