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Check out these two extremely detailed docs: [list][*][URL=http://www.ibiblio.org/apollo/Documents/SLCC_Programmers_Reference_Manual.pdf]Saturn Launch Computer Complex Programmer's Manual[/URL] [*][URL=http://www.ibiblio.org/apollo/Documents/AS-503VerificationProcedures.pdf]AS-503 Verification Test Programs, 73V1201[/URL][/list] You won't find a definition of the the actual Switch Action Table tape format, but the tape is clearly describing the configuration information for the SLCC system. On page 3-9/3-10 (56 in the PDF) of the programmer's manual, it mentions the "Discrete Executive": [i]The Discrete Executive initiates logging at both computers. There are a number of different types of discrete tables each containing specific data. These tables are: [list][*]LDO and MDO Profile table [*]LCCC and MLC Discrete Status tables for IODC's 5 and 7 [*]General Discrete Log table (LDI, LDO, and MDI Changes) [*]MDO Issue table[/list][/i] Section 4.1.1 on 4-3 (p.66) describes "Launch Vehicle Input/Output, Discrete Input/Output" and give details on LDI/LDOs and MDIs/MDOs, which as suspected are LCCC/MLP Digital Input/Outputs. 73V1201 contains the test procedures for verifying the LCC computer software and interface to the launch vehicle are operating correctly. There's a lot of interesting details here, but first check out "Discrete Initialization and Modification (NT98/NT99)" (p.24). Section 5.2.2 (p.27) says: [i]5.2.2 Place cards in the card reader to perform the following action table modification: [list][*]MDI 0010 0N - LDO 1200 issued ON [*]MDI 1200 0N - LDO 0010 issued 0N [*]LDI 0033 0N - MDO 0619 issued 0N [*]LDI 0619 0N - MDO 0033 issued ON[/list][/i] There are numerous references to specific LDI/LDO/MDI/MDO numbers in the test procedures and while all of them don't match up with the data in the file, many do. On page 39 while testing the $DMON display monitor program, LDI0346 and MDI0459 are associated with the "ground camera arm switch" on the vehicle camera networks panel. Another interesting example is the Launch Vehicle Data Adapter communication interfaces. See the "LVDA STATUS CODE CONVERSION CHART" on p.146. For example, if MDI0736 and MDI0734 are ON that indicates "PREPARE TO LAUNCH WITH A PLATFORM." That sounds an awful lot like our tapes. My guess is they're the input data for the NT98 Discrete Initialization Program, which unfortunately isn't described in detail. If anyone can locate the following documents, I bet we'd find what we need there: [list][*]Specification for the Operating System for the Saturn V Launch Computer Complex, Volume 1, Revision 1: MSFC No. III-4-440-4 [*]Operator Reference Manual for SLCC Progranrning System, MSFC No. lII-4-440-5, IBM No. 68-F11-0003, dated 15 June 1968. [*]User Instructions for Saturn V Launch Computer Complex Operating System and Test Programs: MSFC No. III-4-462-1[/list]
[i]The Discrete Executive initiates logging at both computers. There are a number of different types of discrete tables each containing specific data. These tables are: [list][*]LDO and MDO Profile table [*]LCCC and MLC Discrete Status tables for IODC's 5 and 7 [*]General Discrete Log table (LDI, LDO, and MDI Changes) [*]MDO Issue table[/list][/i]
[i]5.2.2 Place cards in the card reader to perform the following action table modification: [list][*]MDI 0010 0N - LDO 1200 issued ON [*]MDI 1200 0N - LDO 0010 issued 0N [*]LDI 0033 0N - MDO 0619 issued 0N [*]LDI 0619 0N - MDO 0033 issued ON[/list][/i]
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