AMSTAIR or AMSTrad Antic Internal Ripper v1.1 by Raft McMillan from the TRSi group is a hardware tool made with components from the Amstrad CPC era that allows the display of Amstrad CPC signals. It allow to hack a game in real time, trace code/ports, diagnostic faulty Amstrad CPC (the gerber plan is available to make it), more precisely it allows :

• Display CPC control lines via LEDs
• Slow down your Amstrad at chosen speed
• Freeze mode with step by step functionality : Step on each Clock, DMA access, CPU instruction, port read, port write, Memory access
• Select the IO port you want to scan
• Show address lines in binary and data lines in hexadecimal
• Output the selected data to SOUND (Really?!)
• Digiblaster compatible mode
• DMA read or write in each cpu modes : fast, slow, paused
• DMA can r/w Memory and IO ports
• Selection of DMA address and data via switchs
• Selection of Port or Memory address to intercept via switchs
• Force DMA for dead z80
• CPC or external power supply
• Reset Amstrad