Sait Z-TECH™ High Performance Cutting Discs,File:Sinclair ZX Spectrum Plus main board Issue 6A (1984) 48K.jpg - Wikimedia Commons,Sinclair Spectrum 128K+2 (Grey) from what I understand this IC (amstrad 40057 8629) controls Joystick input. Any idea why it would be getting extremely hot ? : r/consolerepair,Sinclair ZX Spectrum +2 – Sinclair Collection Site,Is this a particularly rare Spectrum? : r/zxspectrum,