=== Alignment of HSYNC Interrupt ===
A button of starter kit display HSYNC interrupt loopback lines, it's useful to compare to a Maxam test that alternate color on them.
[[File:JavaCPC_running_norecess.jpg]]
Maxam running norecess's "using-interrupts" code [[http://www.norecess.net/using-interrupts.html]]
[[File:FPGAmstrad_interrupt_display_button.jpg]]
Pressing a starter-kit button that displays interrupts.
=== Sniffing of a real Amstrad ===