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(nw) mosaic.cpp: Correct clock speed for PIC chip

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This commit is contained in:
braintro 2019-05-23 22:28:35 -05:00
parent 5cdf86d30b
commit c04e0719e6
1 changed files with 4 additions and 2 deletions
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6
src/mame/drivers/mosaic.cpp
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@ -23,6 +23,7 @@
+--------------------------------------+
CPU: Z180 (surface scratched)
PIC16C5x (surface scratched, exact model unknown)
Sound: YM2203C
OSC: 14.31818MHz, 12.288MHz
DSW: 8 position DSW
@ -34,8 +35,9 @@ Sound: YM2203C
Actual Measured Clocks Derived
Z180 - 6.14522MHz (12.288000MHz/2)
YM2203C - 3.57543MHz (14.318181MHz/4)
PIC16C5x - 3.07252MHz (12.288000MHz/4)
Unknown 28 pin protection chip (PIC, probably PIC16C55) at 5A (UC02 as silkscreened on PCB)
NOTE: PIC16C5x protection chip at 5A (UC02 as silkscreened on PCB)
***************************************************************************/
@ -290,7 +292,7 @@ void mosaic_state::mosaic(machine_config &config)
m_maincpu->set_addrmap(AS_IO, &mosaic_state::mosaic_io_map);
m_maincpu->set_vblank_int("screen", FUNC(mosaic_state::irq0_line_hold));
PIC16C55(config, "pic", 12288000/3); // not confirmed
PIC16C55(config, "pic", XTAL(12'288'000)/4); /* 3.072MHz - Verified */
//read_a().set(FUNC(mosaic_state::));
//write_a().set(FUNC(mosaic_state::));
//read_b().set(FUNC(mosaic_state::));