May 26, 1993
1990 Census of Population and Housing
Summary Tape File 3C
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� Starting The Software �
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Type GO at the DOS prompt and ENTER. Example: L:\>go
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� Using The CD-ROM �
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Summary Tape File 3C is on two CD-ROMs. The first CD-ROM (CD90-3C-1)
contains all geographic summaries except Urbanized Areas and their components.
The second CD-ROM (CD90-3C-2) contains the Urbanized Areas.
The 1990 Summary Tape File 3C software runs on personal computers with 640K
RAM operating under MS-DOS 3.3 or higher. There are no special display
requirements. The CD-ROM is in the ISO 9660 format which requires the use
of Microsoft CD-ROM Extensions Version 2.0 or higher.
The software displays some brief statistical definitions through the glossary
function. Refer to Appendix B (\DOCUMENT\APPEND_B.ASC) of the technical
documentation for the complete text.
For direct access to the data files, one of the many software packages
which recognize the dBASE III Plus (.DBF) format will be very useful.
Users of other types of systems, such as the Apple Macintosh, have access
to the files through support for ISO 9660 CD-ROMs. Please note that the
retrieval software will only run in the MS-DOS environment.
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� Contents Of The CD-ROM �
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Volume in drive is CD90_3C_n
DOCUMENT
Directory for documentation files. These are ASCII text files
which contain complete technical documentation for the data.
See \DOCUMENT\HOWTOUSE.ASC for information on the contents of
the files.
GO.BAT Batch file to execute data retrieval software.
STF3C.EXE Data retrieval software.
STF3??US.DBF Statistical database files. There are 35 files numbered
STF300US.DBF through STF334US.DBF
>>Reference Files<<
STF3STRU.DBF This file describes the structure of the first 67 fields in the
statistical database file. These are the identification fields.
TABLES.DBF This file describes the numeric data tables.
DNAMES.DBF This file contains a list of Tribal Designated Statistical
Areas. (CD90-3C-1 only)
UNAMES.DBF This file contains a list of Urbanized Areas. (CD90-3C-2 only)
MNAMES.DBF This file contains a list of MSA/CMSAs. (CD90-3C-1 only)
RNAMES.DBF This file contains a list of American Indian Reservations.
(CD90-3C-1 only)
VNAMES.DBF This file contains a list of Alaska Native Villages.
(CD90-3C-1 only)
ANAMES.DBF This file contains a list of Tribal Jurisdiction
Statistical Areas. (CD90-3C-1 only)
>>Index Files<<
STF3AMUS.NDX This is a dBASE III index file for STF300US.DBF.
Key fields are SUMLEV + CNTY + COUSUBFP + PLACEFP.
STF3ALUS.NDX This is a dBASE III index file for STF300US.DBF.
Key fields are SUMLEV + left(ANPSADPI,1).
This index is UNIQUE.
TABLES.NDX This is a dBASE III index file for TABLES.DBF.
Key fields are TABLE + FIELD.
DNAMES.NDX This is a dBASE III index file for DNAMES.DBF.
The key field is LEFT(ANPSADPI,1)
UNAMES.NDX This is a dBASE III index file for UNAMES.DBF.
The key field is LEFT(ANPSADPI,1)
MNAMES.NDX This is a dBASE III index file for MNAMES.DBF.
The key field is LEFT(ANPSADPI,1)
RNAMES.NDX This is a dBASE III index file for RNAMES.DBF.
The key field is LEFT(ANPSADPI,1)
VNAMES.NDX This is a dBASE III index file for VNAMES.DBF.
The key field is LEFT(ANPSADPI,1)
ANAMES.NDX This is a dBASE III index file for ANAMES.DBF.
The key field is LEFT(ANPSADPI,1)
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� Converting dBASE Files �
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'**********************************************
'*** This is a Microsoft BASIC program that ***
'*** converts a dBASE (.DBF) file to ASCII ***
'*** (.TXT). ***
'**********************************************
CLS
INPUT "Database file to convert -> ", InFile$
INPUT " Text file -> ", OuFile$
OPEN InFile$ FOR BINARY AS #1
OPEN OuFile$ FOR OUTPUT AS #2
TYPE HdrStru
Filler AS STRING * 4
RecCount AS LONG
HdrBytes AS INTEGER
RecBytes AS INTEGER
END TYPE
DIM Hdr AS HdrStru
GET #1, , Hdr
SEEK #1, Hdr.HdrBytes + 1
RecCntr = 0
DO
Rec$ = STRING$(Hdr.RecBytes, " ")
GET #1, , Rec$
PRINT #2, MID$(Rec$, 2)
RecCntr = RecCntr + 1
IF RecCntr = Hdr.RecCount THEN EXIT DO
LOOP
CLOSE #1, #2
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