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Original Chassis:BIGMAC VTG
Descr: apple bigmac BIGMAC_VTG.pdf
Group:Electronics > Other >
Uploaded:2019-12-08 23:42:23
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BIGMAC_VTG.pdf Rich Page 6/29/85 Yideo/Sound Timing Gate Array: VIG The VTG implements the horizontal and power supply sync signals, the sound clock, the system timer and the interfaces for the front desk bus modem and the clock chip. The horizontal and power supply sync signals are derived from the video dot rate clock divided by 32 (ie. 2.1888 MHz) using a six bit counter and write registers 10 thru 13 which provide control of the horizontal period, horizontal blank stop, horizontal sync start and horizontal sync stop. The default at reset provides a horizontal rate of 1!l.75KHz and a power supply sync at twice the horizo~tal period at 99.5KHz. The refresh/sound counter is fixed at four times the sound rate using a divide of 41.5 from the 3.6864 Mhz clock which yields a clock of 88.8 KHz. The system timer is a, 16 bit counter which counts at a rate of one fourth of the 3.

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