Mercurial > repos > blastem
diff vdp.h @ 470:541c1ae8abf3
Properly delay 68K on VDP reads. Dummy VDP test port implementation. Initial stab at handling undefined bits of VSRAM and CRAM.
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Fri, 13 Sep 2013 19:22:46 -0700 |
| parents | 140af5509ce7 |
| children | f065769836e8 |
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--- a/vdp.h Wed Sep 11 19:26:35 2013 -0700 +++ b/vdp.h Fri Sep 13 19:22:46 2013 -0700 @@ -1,6 +1,6 @@ /* Copyright 2013 Michael Pavone - This file is part of BlastEm. + This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #ifndef VDP_H_ @@ -47,6 +47,7 @@ #define FLAG2_VINT_PENDING 0x01 #define FLAG2_HINT_PENDING 0x02 +#define FLAG2_READ_PENDING 0x04 #define DISPLAY_ENABLE 0x40 @@ -149,6 +150,7 @@ uint16_t col_1; uint16_t col_2; uint16_t last_write_val; + uint16_t last_fifo_val; uint8_t v_offset; uint8_t dma_cd; uint8_t hint_counter; @@ -172,9 +174,11 @@ uint8_t vdp_save_gst(vdp_context * context, FILE * outfile); int vdp_control_port_write(vdp_context * context, uint16_t value); int vdp_data_port_write(vdp_context * context, uint16_t value); +void vdp_test_port_write(vdp_context * context, uint16_t value); uint16_t vdp_control_port_read(vdp_context * context); uint16_t vdp_data_port_read(vdp_context * context); uint16_t vdp_hv_counter_read(vdp_context * context); +uint16_t vdp_test_port_read(vdp_context * context); void vdp_adjust_cycles(vdp_context * context, uint32_t deduction); uint32_t vdp_next_hint(vdp_context * context); uint32_t vdp_next_vint(vdp_context * context);