By Bob Applegate
Adding I/O devices that don’t need much address space. On the KIM-1, the space from 1400-17FF is grouped into the K0 block but only 17xx are used, leaving 1400-16FF open for use. To decode that range into four blocks of 256 bytes is easy using a single chip and a few signals from the KIM Clone expansion bus:
Everyone has a 74LS138 in their parts collection, so just connect a few signals from the expansion bus and use one of the three signals from the 138 to decode which block you want to use. Use the A0-A7 address lines to decode into smaller pieces.
See also:
Load papertape format
The KIM-1 has two methods of loading programs: - from audio files on the audio interface - from papertape from a paper...
The KIM-1 has two methods of loading programs: - from audio files on the audio interface - from papertape from a paper...
Kowalski assembler simulator
Michael Kowalski created the 6502 Simulator many years ago. It simulated the MOS 6502, CMOS 65C02, and the 6501. Daryl R...
Michael Kowalski created the 6502 Simulator many years ago. It simulated the MOS 6502, CMOS 65C02, and the 6501. Daryl R...
Home-Brew Cassette Interface for Micro-KIM
Design by Timothy Alicie Demonstrates his design for a cassette interface for the Micro-KIM single board computer fro...
Design by Timothy Alicie Demonstrates his design for a cassette interface for the Micro-KIM single board computer fro...
CPU NOP testers
While building the Retro Chip Tester, designed by Stephan Slabihoud, and documented on his 8bit-museum website, I no...
While building the Retro Chip Tester, designed by Stephan Slabihoud, and documented on his 8bit-museum website, I no...