Software to run on a 68008 chip, adapted to fit a Compukit UK101.

The UK101 is a 6502-based machine first seen in 1979 as a series of articles in Practical Electronics magazine.

The file 'test.asm' is for use with a freerun rig comprising a 68008 chip and an EPROM. With no RAM or I/O, we can't do much. But we can observe the bus signals and timing using an oscilloscope and/or a logic analyser. The code in this file is intended to explore instruction timing when the /DTACK signal of the 68008 is grounded.

It should be possible to connect a 68008 chip in place of the original 6502 CPU. I've already done this with a 6809 in a hand-wired adaptor. But what to do with the 68008's extra address lines? Fit extra RAM and ROM and map the 6502's address space into the 68008's? Simply restrict it to 64k bytes (which seems a bit limiting)?

MC68008 in a 48-pin DIL package, date coded 9610, week 10 of 1996.

Initially just a solderless breadboard and the 48-pin DIL chip.

Found on the Internet.