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Previously discussed topics.
Hello and Welcome to new thread about recreating MTU CODOS operating system for AIM65, SYM-1, KIM-1, MTU-130/140 made by MTU in 1980’s.
The only available software archive consists of few manuals and few MTU-130 Disks with CODOS in version 2.
First was Apex 65 as alpha system, second one was called CODOS and last one CODOS 2 which was configured especially for MTU-130 computer mainly based on 6502 processor but in very clever way they was able to extend system memory twice using indirect adressing.
For now maybe half of system disk is disassembled and commented. First little modified version (downgrade I should say) starts on fully expanded Kim-1 with Visable memory and Disk controller.
There was probably CODOS version which runs on Apple II.
Hope we’ll make it work again and maybe something more 
Part of progress could be found here:
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Maybe someone good in assembly programming could help us to make it shine again 
MTU-130 and CODOS could be actually tested on Mame
which is nice help with understanding that system.