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0000: THE 'START'
It all starts here when the Spectrum is powered on.
The maskable interrupt is disabled and the DE register pair set to hold the 'top of possible RAM'.
Input
Output
START 0000 DI Disable the 'keyboard interrupt'.
0001 XOR A +00 for start (but +FF for 'NEW').
0002 LD DE,$FFFF Top of possible RAM.
0005 JP START_NEW Jump forward.
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