Uploaded July 2022 | Updated September 2026, 2 weeks ago

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The MPU 8 is my latest and fastest Minecraft Redstone CPU.

Here the MPU 8 is running a FizzBuzz program.
Where for each value:
if the value is divisible by 3 it prints "Fizz",
else if the value is divisible by 5 it prints "Buzz",
else if its divisible by both 3 and 5 it prints "FizzBuzz",
else it prints the value itself in base 10.

This video has been sped up 2 times and the tick speed has been set to 10 times speed. (so a net speed up of 20 times)

This program took 732 cycles to run (12 minutes and 12 seconds at default Minecraft speed).

Join the URCL (Universal Reduced Computer Language) discord:
discord.gg/Nv8jzWg5j8

MPU 8 Specs:
• No command blocks or pistons
• 3.3 Hz clock speed (3 ticks or 0.3 seconds per clock pulse)
• 9 stage waterfall pipeline
• 12 general purpose simulated dual read registers (with automatic forwarding at 6 ticks)
• 8 bit word length
• 256 word instruction ROM x2
• 32 bit instruction length (that includes an 8 bit immediate value)
• VLIW architecture
• 32 bit hardware BCD converter
• 8 bit hardware multiplier
• 8 bit hardware divider
• 64x64 pixel display which can be shifted upwards 8 pixels whenever needed
• 1 frame buffer
• Full qwerty keyboard with arrow keys and function keys for user input
• 128 bytes of main RAM
• 512 bytes of screen RAM
• Up to 128 I/O ports
• External 8 kiB paging ROM for storing large amounts of data
• 13 testable flags
• 8 bit character set (a custom one, so not ASCII) which uses 4x8 characters
• Can be started, stopped and reset from the UI
• Almost fully compatible with URCL

MPU 8 ISA:
docs.google.com/spreadsheets/d/1KRoZNu5ic36-vcP-6llN8L27ZvLxW5ILiaOX5gcoAC4/edit?usp=sharing

If you want to support me creating these videos, my Patreon is:
patreon.com/modpunchtree
or my PayPal link is:
paypal.me/modpunchtree