1Axx = ASSIGN Routine messages

1A1nD1A2nD1A3nD/I1A4nD1A5nD/I1A6nD/I1A7nD/I1A80D
1A81I1A82D1A9nD

1Bxx = Buffer load messages

1B00I1B01A1B02A1B03I1B0nI1B10I1B11D

1Cxx = Job Initiation and Termination messages

1C00A1C10A1C32A1C3nA/I1C4nI1C5nI1C6nD1C70D
1C8nD1C90D

1Ixx = ATTN routine messages

1I00A1I10I1I20I1I32D1I40D1I41D1I42D1I43D
1I44I1I45D1I46D1I47I1I48I1I50I1I60A1I70I
1I80I1I82A/I1I83A1I84A1I85A1I86A1I89A1I90A
1I91A1I92I1I93I1I95A1I96A1I97E1I98I1I99A

1Lxx = Label error messages

1L04A1L0nD/I1L1nD

1Mxx = Cataloged procedures messages

1M10A1M20D1M3nD1M4nD1M5nD1M6nD1M7nD1M8nD
1M9nD

1Nxx = Cataloged procedures messages

1N10D1N2nD1N30D1N40D1N7nD1N80I1N90I

1Pxx = Attention routine messages

1P0nD1P1nD1P20D

1Qxx = POWER messages

1Q01I1Q02I1Q03I1Q04I1Q05I1Q06I1Q07I1Q08I
1Q09I1Q10I1Q11I1Q12I1Q13I1Q14I1Q15I1Q16I
1Q17I1Q18I1Q19I1Q20I1Q21I1Q22I1Q23I1Q24I
1Q25I1Q27I1Q28I1Q29I1Q30I1Q31I1Q32I1Q33I
1Q34I1Q35I1Q36I1Q37I1Q38I1Q39D1Q40D1Q41I
1Q42I1Q43A1Q44I1Q45I1Q46I1Q47A1Q48A1Q49A
1Q50A1Q51A1Q52I1Q53E1Q54I1Q55D1Q56E1Q57E
1Q58E1Q59A1Q60E1Q61E1Q62I1Q63D1Q64A1Q65E
1Q66I1Q67I1Q68I1Q69I1Q70I1Q71I1Q72E1Q73I
1Q74E1Q75E1Q76E1Q77I1Q79I1Q80E1Q81E1Q82D
1Q83I1Q84I1Q85E1Q86I1Q87I1Q88E1Q89I1Q90I/E
1Q91E1Q92E1Q93E1Q94E1Q95I1Q97I

1Rxx = RJE messages

1R01I1R02I1R03I1R04I1R05I1R06I1R07I1R08I
1R09I1R11I1R12I1R13I1R14I1R15I1R16I1R17I
1R18I1R19I1R20I1R21I1R22I1R23I1R24I1R25E
1R26I1R27E1R28E1R29I1R30I1R31I1R32I1R33A
1R51I1R52I1R53A1R54A1R55I1R56A1R57A1R58A
1R59A1R60A1R61A1R62A1R63A1R64A1R65A1R66I
1R67I1R68I1R69I1R70A1R71I1R72A1R73I1R74A
1R75I1R76I1R77I1R78I1R79I

1Sxx = JCL messages

1S0nD1S0nI1S1nD/I

1Txx DOS/VS Enhancements Messages

1T00A1T10I1T20I1T70A