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electron: corrections to beeper
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@ -14,6 +14,7 @@
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#include "sound/beep.h"
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#include "sound/beep.h"
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#include "imagedev/cassette.h"
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#include "imagedev/cassette.h"
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void electron_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
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void electron_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
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{
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{
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switch (id)
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switch (id)
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@ -246,7 +247,12 @@ WRITE8_MEMBER(electron_state::electron_ula_w)
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case 0x06: /* Counter divider */
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case 0x06: /* Counter divider */
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if ( m_ula.communication_mode == 0x01)
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if ( m_ula.communication_mode == 0x01)
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{
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{
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m_beeper->set_frequency( 1000000 / ( 16 * ( data + 1 ) ) );
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/* GUESS
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* the Advanced Users manual says this is the correct algorithm
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* but the divider is wrong(?), says 16 but results in high pitch,
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* 32 is more close
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*/
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m_beeper->set_frequency( 1000000 / ( 32 * ( data + 1 ) ) );
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}
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}
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break;
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break;
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case 0x07: /* Misc. */
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case 0x07: /* Misc. */
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