| Unused

0066: THE 'NON-MASKABLE INTERRUPT' ROUTINE

This routine is not used in the standard Spectrum but the code allows for a system reset to occur following activation of the NMI line. The system variable at 5CB0, named here NMIADD, has to have the value zero for the reset to occur.
RESET | 0066 | PUSH AF | Save the current values held in these registers.
| 0067 | PUSH HL
| 0068 | LD HL,($5CB0) | The two bytes of NMIADD must both be zero for the reset to occur.
| 006B | LD A,H
| 006C | OR L
| 006D | JR NZ,$0070 | Note: this should have been 'JR Z'!
| 006F | JP (HL) | Jump to START.
NO_RESET | 0070 | POP HL | Restore the current values to these registers and return.
| 0071 | POP AF
| 0072 | RETN