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Stuff what I did

Posts Tagged ‘8-Bit’

8-Bit CPU – RAM —

Adding a RAM board to my 8-bit “Hol-1” CPU What is RAM?: Continuing the build of a simple CPU from TTL chips the next step is the random access memory (RAM). It’s not ‘random’ because it’s haphazard but because you can read/write to any section of memory directly using its address. Historically memory devices had […]

8-Bit CPU – ALU —

Building an Arithmetic & Logic Unit (ALU) with TTL logic. Recap: My quest to build an 8-bit central processing unit (CPU) from transistor transistor logic chips (TTL) continues. This initial venture into CPU design being very much guided by Ben Eater’s video tutorials for a computer built on breadboards. Please refer to Ben’s videos for […]

Blinkenlights Plug-in —

Making an LED blinkenlights plug-in for monitoring 8-bit digital circuits. Why?: In my previous 8-bit CPU registers post I mentioned my concern about hard-wiring LEDs onto the CPU circuit boards. Whereas providing a series of 9-pin male headers offered more versatility: test points for a logic analyser, connection points for a console display, connection points […]

8-Bit CPU – Registers —

Building CPU registers with TTL logic and some blinkenlights. Recap: Previously I posted about my quest to build a computer’s central processing unit (CPU) from transistor transistor logic chips (TTL). This initial venture into CPU design being very much guided by Ben Eater’s video tutorials for a computer built on breadboards. Please refer to Ben’s […]

8-Bit CPU – Clock —

Building a CPU clock and controller from 555 timers and TTL logic. Why?: Back in 2015 when I posted an item on Logic Buffers I intended to produce follow-up posts covering common logic chips. Producing each in a simple resistor transistor logic (RTL) format. I was then going to move up a level and use […]