mfd0816
about
The MFD-0816 (alternatively MFD0816, mfd0816 (because im not a very consistent person)) is a 16-bit fantasy CPU and based on the intel 8088, it features a word size of 16 bits, a 16 bit address bus, 4 16-bit general purpose registers and a general purpose I/O bus with support for block I/O.
The current versions of the design/specification alongside the preliminary instruction set reference are available here. The implementations of both an assembler and emulator are now publicly available on GitHub under the GPLv3. Note that the assembler is in a "beta" phase whilst the emulator is still unfinished, missing some instructions a way for user interaction and serious testing for correctness.
All documents detailing the design of the MFD-0816 and other fantasy hardware and tooling around it are licensed under the CC BY-SA 4.0 license.

the emulator
Instead of the emulator bringing a whole system in one program, it is planned to emulate the CPU itself and provide a sort of "plugin interface". Through this, different devices in the form of shared libraries may be configured and loaded (e.g. an address bus controller which in it self allows further devices to be connected to it).
emulator implementation progress
Only the ret and iret instructions still need to be implemented alongside (soft- and hardware) interrupts.
After full implementation comprehensive testing for correctness is also planned.
Kindly hosted and taken care for by tila from heroin.trade :3.


Last generated @ 01.10.2025, 04:06:57 using fpc-sitegen v2.1 ; source data/projects/mfd0816/index.sad @ commit 96255e4