Debug device
From MSX Game Library
Proposal to improve the debugging protocol used by openMSX pseudo-device.
Based on: https://openmsx.org/manual/user.html#debugdevice
Improved debug device protocol
----------------------------------------------------------------------------- Port 0x2E - Mode Set Register ----------------------------------------------------------------------------- 7 6 5 4 3 2 1 0 │ │ │ │ └───┴───┴───┴── Mode-specific parameters │ │ └───┴────────────────── Output mode (0 = OFF, 1 = single byte, 2 = multi byte) │ └────────────────────────── Line feed mode (0 = line feed at mode change, 1 = no line feed) └────────────────────────────── Functionality (0 = output, 1 = command) ----------------------------------------------------------------------------- Functionality = output, Output mode = single byte ----------------------------------------------------------------------------- 7 6 5 4 3 2 1 0 │ │ │ │ │ │ │ └── Hexadecimal mode (0 = OFF, 1 = ON) │ │ │ │ │ │ └────── Binary mode (0 = OFF, 1 = ON) │ │ │ │ │ └────────── Decimal mode (0 = OFF, 1 = ON) : : : : └────────────── ASCII mode (0 = OFF, 1 = ON) ----------------------------------------------------------------------------- Functionality = output, Output mode = multi byte ----------------------------------------------------------------------------- 7 6 5 4 3 2 1 0 │ │ │ │ │ │ └───┴── Mode (0 = hex, 1 = binary, 2 = decimal, 3 = ASCII mode) │ │ │ │ │ └────────── Data width (0 = 8 bits; 1 = 16 bits) : : : : └────────────── Signed (0 = unsigned, 1 = signed) ----------------------------------------------------------------------------- Functionality = command ----------------------------------------------------------------------------- 7 6 5 4 3 2 1 0 : └───┴───┴───┴───┴───┴───┴── Command ID (0x7F = break point)