Voyager FDS Emulator | Flight Data Subsystem

MARINER JUPITER-SATURN '77 Flight Data Subsystem Emulator • 806.4 kHz • 8K × 16-bit CMOS Voyager 1 Current Distance 24,596,234,112 km Signal delay: 22h 51m one-way ◈ FDS Assembly ◈ Registers RA (Accumulator) 0000 RB (Auxiliary) 0000 PC (Program Counter) 000 Cycles 0 ZERO OVFL CARRY BANK ◈ Memory 000: 0000 0000 0000 0000 ◈ Output ◈ DMA Channels MDS DSS ISS PRA ◈ Instructions MLD Load mem→RA MRD Store RA→mem ADD RA + mem SUB RA - mem AND RA & mem JMP Jump SKZ Skip if zero SKP Skip if + WAT Halt DW Define word ◈ Architecture Clock 806.4 kHz ~400,000 instructions/sec Cycle Time 2.48 µs Glacial by modern standards Memory 8K × 16-bit CMOS RAM, two 4K banks Registers RA, RB + 128 Working + special registers Serial I/O 32 in / 16 out For all those instruments DMA 4 channels MDS, DSS, ISS, PRA @ 115.2 kbps Interrupt 2.5 ms Periodic error recovery Word Size 16-bit 12-bit addresses, 4-bit opcode Original Documentation The docs folder contains scanned JPL documentation from 1974-1977, preserved by Wichita State University Special Collections.