DataMuseum.dk

Presents historical artifacts from the history of:

Rational R1000/400 DFS Tapes

This is an automatic "excavation" of a thematic subset of
artifacts from Datamuseum.dk's BitArchive.

See our Wiki for more about Rational R1000/400 DFS Tapes

Excavated with: AutoArchaeologist - Free & Open Source Software.

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⟦0d7cd8f80⟧ EM, TextFile

    Length: 1024 (0x400)
    Types: EM, TextFile
    Names: »CHECK_ECC.EM«

Derivation

└─⟦b4205821b⟧ Bits:30000743 8mm tape, Rational 1000, DFS, D_12_7_3 SEQ288
    └─ ⟦this⟧ »CHECK_ECC.EM« 
└─⟦b434774df⟧ Bits:30000528 8mm tape, Rational 1000, DFS, D_12_6_5
    └─ ⟦this⟧ »CHECK_ECC.EM« 
└─⟦bc1274df5⟧ Bits:30000750 8mm tape, Rational 1000, DFS backup from PAM's R1000
    └─ ⟦this⟧ »CHECK_ECC.EM«

TextFile

! CHECK_ECC (%1% = TYPE, %2% = VAL, %3% = CHECKBITS)
! Returns null if ECC is OK, bad bit if not

[set bad_bit [syndrome [xor [ecc_of %1% %2%] %3%]]]
[eq,,[var bad_bit]]
  ECC OK
[else]
  [eq,MULT,[var bad_bit]]
    MULTIPLE BAD BITS
  [else]
    [var bad_bit] BAD
  [end]
[end]
[kill bad_bit]«nul»