SEQUENTIAL 516 PRO FX SERVICE MANUAL ocr

Sequential Circuits, Inc. PROFX MODULE 516 PARAMETRIC EQUALIZER 3051 North First Street PRELIMINARY SERVICE DATA San 3ose, CA 9513¿f-2093 Manual No. TN516-0 (408) 9 な6-52な0 Issued: September, 1982 TELEX: 364412 INTR Nijverheidsweg 11c 3641 RP Mijdrecht T E L E X:12721 SQNTL NL SEQUENTIAL CIRCUITS, INC. All rights reserved. Printed in USA. PRELIMINARY INFORMATION All subject to change. U119 8255 Programmable Peripheral Interface has three bus groups, denoted PA, PB and PC. The PA bus provides swtich bits to U109 switch latch. The PB bus accepts the four switch inputs, plus low signals from Q107 and Q108 which code the number of pots and DACs. The PC bus outputs the switch latch strobe, pot and S/H addresses and strobes to the Vade multiplexer and Vdac demultiplexer. The Vade multiplexer sequentially samples the pots to be digitized by the ADC window comparator in the System Controller. T

Sequential Circuits, Inc. PROFX MODULE 516 PARAMETRIC EQUALIZER 3051 North First Street PRELIMINARY SERVICE DATA San 3ose, CA 9513¿f-2093 Manual No. TN516-0 (408) 9 な6-52な0 Issued: September, 1982 TELEX: 364412 INTR Nijverheidsweg 11c 3641 RP Mijdrecht Netherlands 02979-6211 T E L E X :12721 SQNTL NL Copyright©1982 by SEQUENTIAL CIRCUITS, INC. All rights reserved. Printed in USA. PRELIMINARY INFORMATION All subject to change. U119 8255 Programmable Peripheral Interface has three bus groups, denoted PA, PB and PC. The PA bus provides swtich bits to U109 switch latch. The PB bus accepts the four switch inputs, plus low signals from Q107 and Q108 which code the number of pots and DACs. The PC bus outputs the switch latch strobe, pot and S/H addresses and strobes to the Vade multiplexer and Vdac demultiplexer. The Vade multiplexer sequentially samples the pots to be digitized by the ADC window comparator in the System Controller. The Vdac demultiplexer serves two purposes. First, it supplies control voltages to the filter frequency VCAs. Secondly, it supplies a -CS to the DACs which control input level,EQ and bandwidth. The data for these DACs are provided by the PA bus during the -CS…