What was the ASCII end of medium (EM) character intended to be used for?What was the first C compiler for the...
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What was the ASCII end of medium (EM) character intended to be used for?
What was the first C compiler for the IBM PC?What file systems / encapsulation formats used ASCII?Executable ASCII files before x86?What's the deal with System/360's “USASCII” mode?Where was MS-DOS used?Can I build a working(ish) vacuum tube byte?Was the character in the Game & Watch series supposed to be his own unique character?Why are the symbols on the number keys of PC & Mac keyboards different to ASCII keyboards?What characters which were in use at the time were excluded from ASCII?Why wasn't ASCII designed with a contiguous alphanumeric character order?
I can find information about how characters were used to structure transmissions in general, and I can find information about transmission characters which are still commonly used today, though perhaps not for their originally intended purpose. But I am unable to find anything more on the "end of medium" character (EM, 0x19, decimal 25) than that name among listings of all the ASCII characters.
What was this character intended to be used for (AKA what sense of the word "medium" was meant)? Was it ever actually widely used for that purpose, or any other?
history data-transfer ascii
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Ryan1729Ryan1729
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I can find information about how characters were used to structure transmissions in general, and I can find information about transmission characters which are still commonly used today, though perhaps not for their originally intended purpose. But I am unable to find anything more on the "end of medium" character (EM, 0x19, decimal 25) than that name among listings of all the ASCII characters.
What was this character intended to be used for (AKA what sense of the word "medium" was meant)? Was it ever actually widely used for that purpose, or any other?
history data-transfer ascii
asked 8 hours ago
Ryan1729Ryan1729
1112 bronze badges
New contributor
Ryan1729 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
– scruss
8 hours ago
@scruss Why not make an Answer of that Comment, so it can be accepted and resolve this Question?
– Basil Bourque
6 hours ago
@BasilBourque I thought it was a bit thin, but if you say so …
– scruss
6 hours ago
add a comment |
I can find information about how characters were used to structure transmissions in general, and I can find information about transmission characters which are still commonly used today, though perhaps not for their originally intended purpose. But I am unable to find anything more on the "end of medium" character (EM, 0x19, decimal 25) than that name among listings of all the ASCII characters.
What was this character intended to be used for (AKA what sense of the word "medium" was meant)? Was it ever actually widely used for that purpose, or any other?
history data-transfer ascii
asked 8 hours ago
Ryan1729Ryan1729
1112 bronze badges
New contributor
Ryan1729 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I can find information about how characters were used to structure transmissions in general, and I can find information about transmission characters which are still commonly used today, though perhaps not for their originally intended purpose. But I am unable to find anything more on the "end of medium" character (EM, 0x19, decimal 25) than that name among listings of all the ASCII characters.
What was this character intended to be used for (AKA what sense of the word "medium" was meant)? Was it ever actually widely used for that purpose, or any other?
history data-transfer ascii
history data-transfer ascii
asked 8 hours ago
Ryan1729Ryan1729
1112 bronze badges
New contributor
Ryan1729 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Ryan1729Ryan1729
1112 bronze badges
New contributor
Ryan1729 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Ryan1729Ryan1729
1112 bronze badges
New contributor
Ryan1729 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Ryan1729Ryan1729
1112 bronze badges
asked 8 hours ago
Ryan1729Ryan1729
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1112 bronze badges
New contributor
Ryan1729 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Ryan1729 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
– scruss
8 hours ago
@scruss Why not make an Answer of that Comment, so it can be accepted and resolve this Question?
– Basil Bourque
6 hours ago
@BasilBourque I thought it was a bit thin, but if you say so …
– scruss
6 hours ago
add a comment |
1
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
– scruss
8 hours ago
@scruss Why not make an Answer of that Comment, so it can be accepted and resolve this Question?
– Basil Bourque
6 hours ago
@BasilBourque I thought it was a bit thin, but if you say so …
– scruss
6 hours ago
1
1
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
– scruss
8 hours ago
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
– scruss
8 hours ago
@scruss Why not make an Answer of that Comment, so it can be accepted and resolve this Question?
– Basil Bourque
6 hours ago
@scruss Why not make an Answer of that Comment, so it can be accepted and resolve this Question?
– Basil Bourque
6 hours ago
@BasilBourque I thought it was a bit thin, but if you say so …
– scruss
6 hours ago
@BasilBourque I thought it was a bit thin, but if you say so …
– scruss
6 hours ago
add a comment |
1 Answer
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Wikipedia
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
ECMA-6
ASCII was codified internationally as ISO/IEC 646 which in turn was ratified by ECMA as ECMA-6. Section 8.12 EM END OF MEDIUM of a PDF image document of the 5th Edition (March 1985) reads:
A control character that may be used to identify the physical end of a medium, or the old of the used portion of a medium, or the end of the wanted portion of data recorded on a medium. The position of this character does not necessarily correspond to the physical end of the medium.
edited 4 hours ago
Basil Bourque
1133 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
FYI, this source mentions a note about ASCII 25EM: “(VMS: stronger user interrupt)” which I assume refers to the VMS operating system of a DEC VAX.
– Basil Bourque
5 hours ago
I’d still be interested in information about any usages of this character, or some kind of evidence that it was never widely used for its intended purpose. But if it was never actually widely used, I suppose there wouldn’t be an easy way to determine that!
– Ryan1729
5 hours ago
On reel-to-reel magnetic tape drives, there were typically two separate data block formats, signifying "end of file" and "end of tape". One tape reel might contain several files, or one file might occupy more than one tape. The basic function of the "end of tape" block was to stop the tape drive over-winding the tape. I wonder if the ASCII EM code was intended as a device-independent coding this end-of-tape condition. Confusingly, the ASCII EOT code (end of transmission) effectively meant "end of file", not "end of tape", at least in Unix.
– alephzero
5 hours ago
The EOT sentinel on magtapes was generally not a recorded mark, but reflective tape. However, there was certainly a convention to distinguish end of file from end of volume; the latter was (if memory serves) two consecutive tape marks.
– another-dave
4 hours ago
add a comment |
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Wikipedia
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
ECMA-6
ASCII was codified internationally as ISO/IEC 646 which in turn was ratified by ECMA as ECMA-6. Section 8.12 EM END OF MEDIUM of a PDF image document of the 5th Edition (March 1985) reads:
A control character that may be used to identify the physical end of a medium, or the old of the used portion of a medium, or the end of the wanted portion of data recorded on a medium. The position of this character does not necessarily correspond to the physical end of the medium.
edited 4 hours ago
Basil Bourque
1133 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
FYI, this source mentions a note about ASCII 25EM: “(VMS: stronger user interrupt)” which I assume refers to the VMS operating system of a DEC VAX.
– Basil Bourque
5 hours ago
I’d still be interested in information about any usages of this character, or some kind of evidence that it was never widely used for its intended purpose. But if it was never actually widely used, I suppose there wouldn’t be an easy way to determine that!
– Ryan1729
5 hours ago
On reel-to-reel magnetic tape drives, there were typically two separate data block formats, signifying "end of file" and "end of tape". One tape reel might contain several files, or one file might occupy more than one tape. The basic function of the "end of tape" block was to stop the tape drive over-winding the tape. I wonder if the ASCII EM code was intended as a device-independent coding this end-of-tape condition. Confusingly, the ASCII EOT code (end of transmission) effectively meant "end of file", not "end of tape", at least in Unix.
– alephzero
5 hours ago
The EOT sentinel on magtapes was generally not a recorded mark, but reflective tape. However, there was certainly a convention to distinguish end of file from end of volume; the latter was (if memory serves) two consecutive tape marks.
– another-dave
4 hours ago
add a comment |
Wikipedia
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
ECMA-6
ASCII was codified internationally as ISO/IEC 646 which in turn was ratified by ECMA as ECMA-6. Section 8.12 EM END OF MEDIUM of a PDF image document of the 5th Edition (March 1985) reads:
A control character that may be used to identify the physical end of a medium, or the old of the used portion of a medium, or the end of the wanted portion of data recorded on a medium. The position of this character does not necessarily correspond to the physical end of the medium.
edited 4 hours ago
Basil Bourque
1133 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
FYI, this source mentions a note about ASCII 25EM: “(VMS: stronger user interrupt)” which I assume refers to the VMS operating system of a DEC VAX.
– Basil Bourque
5 hours ago
I’d still be interested in information about any usages of this character, or some kind of evidence that it was never widely used for its intended purpose. But if it was never actually widely used, I suppose there wouldn’t be an easy way to determine that!
– Ryan1729
5 hours ago
On reel-to-reel magnetic tape drives, there were typically two separate data block formats, signifying "end of file" and "end of tape". One tape reel might contain several files, or one file might occupy more than one tape. The basic function of the "end of tape" block was to stop the tape drive over-winding the tape. I wonder if the ASCII EM code was intended as a device-independent coding this end-of-tape condition. Confusingly, the ASCII EOT code (end of transmission) effectively meant "end of file", not "end of tape", at least in Unix.
– alephzero
5 hours ago
The EOT sentinel on magtapes was generally not a recorded mark, but reflective tape. However, there was certainly a convention to distinguish end of file from end of volume; the latter was (if memory serves) two consecutive tape marks.
– another-dave
4 hours ago
add a comment |
Wikipedia
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
ECMA-6
ASCII was codified internationally as ISO/IEC 646 which in turn was ratified by ECMA as ECMA-6. Section 8.12 EM END OF MEDIUM of a PDF image document of the 5th Edition (March 1985) reads:
A control character that may be used to identify the physical end of a medium, or the old of the used portion of a medium, or the end of the wanted portion of data recorded on a medium. The position of this character does not necessarily correspond to the physical end of the medium.
edited 4 hours ago
Basil Bourque
1133 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
Wikipedia
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
ECMA-6
ASCII was codified internationally as ISO/IEC 646 which in turn was ratified by ECMA as ECMA-6. Section 8.12 EM END OF MEDIUM of a PDF image document of the 5th Edition (March 1985) reads:
A control character that may be used to identify the physical end of a medium, or the old of the used portion of a medium, or the end of the wanted portion of data recorded on a medium. The position of this character does not necessarily correspond to the physical end of the medium.
edited 4 hours ago
Basil Bourque
1133 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
edited 4 hours ago
Basil Bourque
1133 bronze badges
edited 4 hours ago
Basil Bourque
1133 bronze badges
edited 4 hours ago
Basil Bourque
1133 bronze badges
1133 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
answered 5 hours ago
scrussscruss
7,8531 gold badge15 silver badges51 bronze badges
7,8531 gold badge15 silver badges51 bronze badges
FYI, this source mentions a note about ASCII 25EM: “(VMS: stronger user interrupt)” which I assume refers to the VMS operating system of a DEC VAX.
– Basil Bourque
5 hours ago
I’d still be interested in information about any usages of this character, or some kind of evidence that it was never widely used for its intended purpose. But if it was never actually widely used, I suppose there wouldn’t be an easy way to determine that!
– Ryan1729
5 hours ago
On reel-to-reel magnetic tape drives, there were typically two separate data block formats, signifying "end of file" and "end of tape". One tape reel might contain several files, or one file might occupy more than one tape. The basic function of the "end of tape" block was to stop the tape drive over-winding the tape. I wonder if the ASCII EM code was intended as a device-independent coding this end-of-tape condition. Confusingly, the ASCII EOT code (end of transmission) effectively meant "end of file", not "end of tape", at least in Unix.
– alephzero
5 hours ago
The EOT sentinel on magtapes was generally not a recorded mark, but reflective tape. However, there was certainly a convention to distinguish end of file from end of volume; the latter was (if memory serves) two consecutive tape marks.
– another-dave
4 hours ago
add a comment |
FYI, this source mentions a note about ASCII 25EM: “(VMS: stronger user interrupt)” which I assume refers to the VMS operating system of a DEC VAX.
– Basil Bourque
5 hours ago
I’d still be interested in information about any usages of this character, or some kind of evidence that it was never widely used for its intended purpose. But if it was never actually widely used, I suppose there wouldn’t be an easy way to determine that!
– Ryan1729
5 hours ago
On reel-to-reel magnetic tape drives, there were typically two separate data block formats, signifying "end of file" and "end of tape". One tape reel might contain several files, or one file might occupy more than one tape. The basic function of the "end of tape" block was to stop the tape drive over-winding the tape. I wonder if the ASCII EM code was intended as a device-independent coding this end-of-tape condition. Confusingly, the ASCII EOT code (end of transmission) effectively meant "end of file", not "end of tape", at least in Unix.
– alephzero
5 hours ago
The EOT sentinel on magtapes was generally not a recorded mark, but reflective tape. However, there was certainly a convention to distinguish end of file from end of volume; the latter was (if memory serves) two consecutive tape marks.
– another-dave
4 hours ago
FYI, this source mentions a note about ASCII 25
EM: “(VMS: stronger user interrupt)” which I assume refers to the VMS operating system of a DEC VAX.– Basil Bourque
5 hours ago
FYI, this source mentions a note about ASCII 25
EM: “(VMS: stronger user interrupt)” which I assume refers to the VMS operating system of a DEC VAX.– Basil Bourque
5 hours ago
I’d still be interested in information about any usages of this character, or some kind of evidence that it was never widely used for its intended purpose. But if it was never actually widely used, I suppose there wouldn’t be an easy way to determine that!
– Ryan1729
5 hours ago
I’d still be interested in information about any usages of this character, or some kind of evidence that it was never widely used for its intended purpose. But if it was never actually widely used, I suppose there wouldn’t be an easy way to determine that!
– Ryan1729
5 hours ago
On reel-to-reel magnetic tape drives, there were typically two separate data block formats, signifying "end of file" and "end of tape". One tape reel might contain several files, or one file might occupy more than one tape. The basic function of the "end of tape" block was to stop the tape drive over-winding the tape. I wonder if the ASCII EM code was intended as a device-independent coding this end-of-tape condition. Confusingly, the ASCII EOT code (end of transmission) effectively meant "end of file", not "end of tape", at least in Unix.
– alephzero
5 hours ago
On reel-to-reel magnetic tape drives, there were typically two separate data block formats, signifying "end of file" and "end of tape". One tape reel might contain several files, or one file might occupy more than one tape. The basic function of the "end of tape" block was to stop the tape drive over-winding the tape. I wonder if the ASCII EM code was intended as a device-independent coding this end-of-tape condition. Confusingly, the ASCII EOT code (end of transmission) effectively meant "end of file", not "end of tape", at least in Unix.
– alephzero
5 hours ago
The EOT sentinel on magtapes was generally not a recorded mark, but reflective tape. However, there was certainly a convention to distinguish end of file from end of volume; the latter was (if memory serves) two consecutive tape marks.
– another-dave
4 hours ago
The EOT sentinel on magtapes was generally not a recorded mark, but reflective tape. However, there was certainly a convention to distinguish end of file from end of volume; the latter was (if memory serves) two consecutive tape marks.
– another-dave
4 hours ago
add a comment |
Ryan1729 is a new contributor. Be nice, and check out our Code of Conduct.
Ryan1729 is a new contributor. Be nice, and check out our Code of Conduct.
Ryan1729 is a new contributor. Be nice, and check out our Code of Conduct.
Ryan1729 is a new contributor. Be nice, and check out our Code of Conduct.
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1
“Intended as means of indicating on paper or magnetic tapes that the end of the usable portion of the tape had been reached.”, if en.wikipedia.org/wiki/C0_and_C1_control_codes#EM is to be believed. ASCII contains enough control codes to model complete linear record-based filing systems, but I've never seen any actual use of these features in the wild.
– scruss
8 hours ago
@scruss Why not make an Answer of that Comment, so it can be accepted and resolve this Question?
– Basil Bourque
6 hours ago
@BasilBourque I thought it was a bit thin, but if you say so …
– scruss
6 hours ago