T80 cpu
T80 do not exit HALT in INT #5
Open ukapitan opened this issue over 9 years ago
ukapitan commented over 9 years ago
program: EI HALT
T80 enter halt state, INT later has no effect
ukapitan commented over 9 years ago
Z80 manual says: During the execution of this instruction and the following instruction, maskable interrupts
are disabled.
which is true, however on the real Z80 sequence EI HALT work just fine. HALT works like NOP and interupts are disabled on first NOP execution and enabled on subsequent NOP executions.
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