Mercurial > repos > blastem
diff vdp.c @ 333:f16136a3835d
Update Z80 vint timing
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Tue, 14 May 2013 00:40:10 -0700 |
| parents | 671a5be51522 |
| children | 4c91470e1a53 |
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--- a/vdp.c Tue May 14 00:28:45 2013 -0700 +++ b/vdp.c Tue May 14 00:40:10 2013 -0700 @@ -1572,6 +1572,18 @@ return vcycle; } +uint32_t vdp_next_vint_z80(vdp_context * context) +{ + uint32_t active_lines = context->latched_mode & BIT_PAL ? PAL_ACTIVE : NTSC_ACTIVE; + uint32_t vcycle = MCLKS_LINE * active_lines; + if (context->latched_mode & BIT_H40) { + vcycle += VINT_CYCLE_H40; + } else { + vcycle += VINT_CYCLE_H32; + } + return vcycle; +} + void vdp_int_ack(vdp_context * context, uint16_t int_num) { if (int_num == 6) {