Let's reverse engineer this "Issue 1.5" spectrum - AKA an issue 2 with an issue 1 ULA and a "Dead Cockroach"!
If you enjoyed this then check out:
Reversed Engineered - The Kempston Joystick Interface - https://www.youtube.com/watch?v=4e1MlxPVyD4
The ZX Spectrum ULA (No affiliation) - https://www.amazon.co.uk/ZX-Spectrum-Ula-Microcomputer-Computer/dp/0956507107
Amazon links to stuff I use! - https://linktr.ee/happylittlediodes
Patreon - https://www.patreon.com/happylittlediodes
Repair work - https://happylittlediodes.wixsite.com/website
Join me on Discord! - https://discord.gg/ua5d8jQ6