< Hi Tony, I have an 8089 in a CPM machine but I haven't been able to fin <out much about that chip. What can you tell me about it? 8089 is an IOP (IO processor). It is a super intelligent dual DMA channel and 20 bit cpu combined. I have a few and docs. It can run 8 or 16 bit busses in local or remote modes (or mixed). Commonly used with 8086 to offload the cpu from taking IO interrupts and doing high speed interfaces. While it could be used as a general purpose processor the instruction set and stucture was more for moving data (or tables of data) than arithmetic. < FWIW the same machine has ECC memory controller in it too but I don't <remember it's number. Memory is in banks of 11 ICs! Likely the 8206 or 8207 Allison