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• ARM CoProcessor
  * Optional serial EEPROM for parameter storage * Optional RS232 port for debugging use
  1 KB (165 words) - 23:20, 8 March 2015
• Acorn cassette format
  ...l ULA]]; the Atom and Electron, feeding the signal straight into a digital port, seem 'deaf' to some cassettes but not others, and yet tape-to-tape copies ...e signal and data layers of the Acorn protocol are fixed in hardware. The serial ULA sets the modulation frequencies, and the ACIA restricts the format of e
  15 KB (2,457 words) - 18:25, 27 March 2023
• Acorn machines
  disk drives, a parallel printer port, a user port, 1Mhz bus for further 6502 2MHz, 32K RAM, 32K ROM. Cut down BBC Model B, no teletext, no serial,
  5 KB (693 words) - 13:39, 17 October 2020
• BBC Micro
  the day. Options comprised a cassette interface, RS-423 serial port, printer port, memory-mapped user port, 1Mhz bus interface, the [[Tube]]
  13 KB (2,114 words) - 13:45, 17 October 2020
• Econet and NFS versions
  <dest stnlo><dest stnhi><src stnlo><src stnhi><flag><port> Ethernet. I have uncompleted code to use the serial port.
  7 KB (1,055 words) - 20:12, 8 March 2015
• IO
  Expandable port for adding devices directly to the system bus. * User Port
  3 KB (525 words) - 20:12, 8 March 2015
• Master 128
  === Serial Interface === === User Port ===
  9 KB (1,381 words) - 14:17, 17 October 2020
• Model A
  the day. Options comprised a cassette interface, RS-423 serial port, port, memory-mapped user port, 1MHz bus interface, the Tube connector for
  3 KB (492 words) - 14:31, 17 October 2020
• OSBYTE &02
  X=1 Use the serial circuit for input X=2 Use the keyboard for input, but listen to the serial port too
  432 bytes (65 words) - 20:12, 8 March 2015
• OSBYTE &03
  | 0 || '''Enable''' serial port | *FX3,0 || normal state, serial disabled, VDU enabled, printer enabled by VDU 2, spool output if *SPOOL fil
  2 KB (243 words) - 16:05, 14 November 2021
• OSBYTE &06
  Alternatively by setting a serial printer with [[OSBYTE &05]] and using the printer stream instead of the serial port for output (with [[OSBYTE &03]]),
  1 KB (213 words) - 20:12, 8 March 2015
• OSBYTE &A3
  Y=2 enable serial port Y=3 disable serial port
  6 KB (863 words) - 16:23, 22 December 2023
• OSWORD &81
  * &00 Enable serial transmitter * &01 Disable serial transmitter
  3 KB (322 words) - 14:58, 19 March 2021
• OSWRCH
  output stream(s), namely the screen, printer, serial port, spool file or any
  6 KB (945 words) - 21:32, 17 September 2023
• Serial ULA
  ...ge:Serial ULAs.jpg|thumb|176 px|The Ferranti Serial ULA, top, and the VLSI Serial Processor.]] The '''serial ULA''' is a custom Integrated Circuit (IC) developed by Acorn
  6 KB (855 words) - 23:44, 30 August 2021
• VDU
  serial port or other output device. It is usually used to generate VDU do. It can also be used to send binary data to the printer, serial port,
  7 KB (1,070 words) - 14:22, 15 February 2024
• VDU 27
  An incoming ESC from the serial port can also generate an escape condition, see [[OSBYTE &B5]].
  2 KB (267 words) - 20:13, 8 March 2015
• Master Compact
  user port, RF output and cassette interface were removed, with the serial port relegated to an optional upgrade. Meanwhile the joystick, printer and
  2 KB (243 words) - 14:20, 17 October 2020
• Allocations
  use [[OSBYTE &9C|OSBYTE &9C (156)]] to control the serial port in the same manner.
  2 KB (369 words) - 19:40, 24 November 2020
• Acorn Atom
  card was also available. A 6522 VIA controls the serial and parallel ports. *Centronics printer port (requires 6522 VIA installed)
  2 KB (342 words) - 13:31, 17 October 2020