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xtal.h: added a small note [Guru]

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Ivan Vangelista 2017-11-23 07:21:35 +01:00 committed by GitHub
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7
src/emu/drivers/xtal.h
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@ -34,6 +34,11 @@
MAME doesn't yet support fractions in crystal frequencies. For example,
XTAL_3_579545MHz should actually be 3579545.454545...Hz (39375000/11).
This is no problem though: see above note about tolerance.
In the "Examples" column, please don't add 1000 examples, this is just
for interest, so two or three examples is enough.
The actual reference where the xtals are used can be found in the
driver files by searching for the frequency (e.g. "XTAL_4_9152MHz")
(Thanks to Guru for starting this documentation.)
@ -92,7 +97,7 @@ enum
XTAL_5_911MHz = 5911000, /* Philips Videopac Plus G7400 */
XTAL_5_9904MHz = 5990400, /* Luxor ABC 800 keyboard (Keytronic custom part #48-300-008 is equivalent) */
XTAL_6MHz = 6000000, /* American Poker II, Taito SJ System */
XTAL_6_144MHz = 6144000, /* Used on Alpha Denshi early 80's games sound board, Casio FP-200 and Namco System 16 */
XTAL_6_144MHz = 6144000, /* Used on Alpha Denshi early 80's games sound board, Casio FP-200 and Namco Universal System 16 */
XTAL_6_5MHz = 6500000, /* Jupiter Ace */
XTAL_6_9MHz = 6900000, /* BBN BitGraph CPU */
XTAL_7MHz = 7000000, /* Jaleco Mega System PCBs */