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comparison blastem.c @ 333:f16136a3835d

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Update Z80 vint timing
author Mike Pavone <pavone@retrodev.com>
date Tue, 14 May 2013 00:40:10 -0700
parents 1b00258b1f29
children 14a937097c2b
comparison
equal deleted inserted replaced
332:671a5be51522 333:f16136a3835d
160 #endif 160 #endif
161 161
162 void sync_z80(z80_context * z_context, uint32_t mclks) 162 void sync_z80(z80_context * z_context, uint32_t mclks)
163 { 163 {
164 if (z80_enabled && !reset && !busreq) { 164 if (z80_enabled && !reset && !busreq) {
165 genesis_context * gen = z_context->system;
165 if (need_reset) { 166 if (need_reset) {
166 z80_reset(z_context); 167 z80_reset(z_context);
167 need_reset = 0; 168 need_reset = 0;
168 } 169 }
169 z_context->sync_cycle = mclks / MCLKS_PER_Z80; 170 z_context->sync_cycle = mclks / MCLKS_PER_Z80;
171 uint32_t vint_cycle = vdp_next_vint_z80(gen->vdp) / MCLKS_PER_Z80;
170 while (z_context->current_cycle < z_context->sync_cycle) { 172 while (z_context->current_cycle < z_context->sync_cycle) {
171 if (z_context->iff1 && z_context->current_cycle < ZVINT_CYCLE) { 173 if (z_context->iff1 && z_context->current_cycle < ZVINT_CYCLE) {
172 z_context->int_cycle = ZVINT_CYCLE; 174 z_context->int_cycle = vint_cycle;
173 } 175 }
174 z_context->target_cycle = z_context->sync_cycle < z_context->int_cycle ? z_context->sync_cycle : z_context->int_cycle; 176 z_context->target_cycle = z_context->sync_cycle < z_context->int_cycle ? z_context->sync_cycle : z_context->int_cycle;
175 dprintf("Running Z80 from cycle %d to cycle %d. Native PC: %p\n", z_context->current_cycle, z_context->sync_cycle, z_context->native_pc); 177 dprintf("Running Z80 from cycle %d to cycle %d. Native PC: %p\n", z_context->current_cycle, z_context->sync_cycle, z_context->native_pc);
176 z80_run(z_context); 178 z80_run(z_context);
177 dprintf("Z80 ran to cycle %d\n", z_context->current_cycle); 179 dprintf("Z80 ran to cycle %d\n", z_context->current_cycle);