View full screen - View 1 of Lot 31. IU Command Decoder.
31

IU Command Decoder

Estimate:

1,500

to
- 2,500 USD

IU Command Decoder

IU Command Decoder

Estimate:

1,500

to
- 2,500 USD

Lot sold:

16,380

USD

[Saturn IB/V]


IU Command Decoder


8 x 9 x 41/2 in. flight hardware, consisting of electronics in a metal case, 8.4 lbs. Metal Marshall Space Flight Center nameplate reading: "U.S. I U COMMAND DECODER. PT. NO. 50Z12705-015, MOD. NO. SER NO. 006 WT. 8.4 LBS. MFD. BY SPACE CRAFT INC. CONT. NO. NAS 8-14000 MEAS. MARSHALL SPACE FLIGHT CENTER."


Six white stickers reading "IBM QUALITY ASSURANCE DO NOT BREAK THE SEAL", two blue stickers reading "SCI CERTIFICATION VOID IF BROKEN".


Along with TECHNICAL MANUAL SATURN IB/V INSTRUMENT UNIT SYSTEM DESCRIPTION AND COMPONENT DATA, Prepared under contract NAS 8-14000 by International Business Machines Corporation, Federal Systems Division, Huntsville, AL. 1 June 1966, Changed 1 May 1969.


On the Saturn IB and V, a launch vehicle digital computer (LVDC) solved most guidance calculations onboard. Any commands sent by Mission Control in Houston first went to the command decoder next to the LVDC, which checked the command for accuracy and authenticity, decided which part of the LVDC should handle the issue, and sent the command on to the LVDC.

According to attached documents, "The Command Decoder is the interface unit between the Saturn IB Command Receiver or Saturn V CCS Transponder and the LVDA. Data transmission is made through a 35-bit word, each word bit being composed of 5 sub-bits, on which the Command Decoder performs error checking, decoding, and address verification. Also, the decoder routes two outputs to the PCM telemetry system indicating that the word has been accepted and verified by the LVDC."