Skip to main content
Retrocomputing

Return to Answer

Spelling fixes
Source Link
Toby Speight
Toby Speight
  • 1.7k
  • 1
  • 14
  • 31

IBM 1401 and Honeywell 200 family machines had 6 data bits, a word mark and an item mark bit per location; both on were a record mark. Most instructions went down in ramRAM from the units character to a word mark, but others went up, like ioI/O, and termedterminated on a word, an item or a record mark. The character could be bcdBCD or unsigned binary. It was a BCDIC time, pre ascii-ASCII, pre ebcdicEBCDIC, way pre Unicode, way pre utfUTF-8!

IBM 1401 and Honeywell 200 family machines had 6 data bits, a word mark and an item mark bit per location; both on were a record mark. Most instructions went down in ram from the units character to a word mark, but others went up, like io, and termed on a word, an item or a record mark. The character could be bcd or unsigned binary. It was a BCDIC time, pre ascii, pre ebcdic, way pre Unicode, way pre utf-8!

IBM 1401 and Honeywell 200 family machines had 6 data bits, a word mark and an item mark bit per location; both on were a record mark. Most instructions went down in RAM from the units character to a word mark, but others went up, like I/O, and terminated on a word, an item or a record mark. The character could be BCD or unsigned binary. It was a BCDIC time, pre-ASCII, pre EBCDIC, way pre Unicode, way pre UTF-8!

Source Link
David Pickett
David Pickett
  • 1

IBM 1401 and Honeywell 200 family machines had 6 data bits, a word mark and an item mark bit per location; both on were a record mark. Most instructions went down in ram from the units character to a word mark, but others went up, like io, and termed on a word, an item or a record mark. The character could be bcd or unsigned binary. It was a BCDIC time, pre ascii, pre ebcdic, way pre Unicode, way pre utf-8!