diff options
| -rw-r--r-- | blastem.c | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -170,6 +170,8 @@ uint8_t new_busack = 0; #define dputs #endif +#define Z80_VINT_DURATION 128 + void sync_z80(z80_context * z_context, uint32_t mclks) { if (z80_enabled && !reset && !busreq) { @@ -181,7 +183,7 @@ void sync_z80(z80_context * z_context, uint32_t mclks) z_context->sync_cycle = mclks / MCLKS_PER_Z80; uint32_t vint_cycle = vdp_next_vint_z80(gen->vdp) / MCLKS_PER_Z80; while (z_context->current_cycle < z_context->sync_cycle) { - if (z_context->iff1 && z_context->current_cycle < vint_cycle) { + if (z_context->iff1 && z_context->current_cycle < (vint_cycle + Z80_VINT_DURATION)) { z_context->int_cycle = vint_cycle < z_context->int_enable_cycle ? z_context->int_enable_cycle : vint_cycle; } z_context->target_cycle = z_context->sync_cycle < z_context->int_cycle ? z_context->sync_cycle : z_context->int_cycle; |