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• Cycle stretching
  * the [[6850]] [[ACIA]];
  2 KB (347 words) - 20:12, 8 March 2015
• IO
  Driven by a [[6850]] ACIA, through the [[Serial ULA]]. Driven by a [[6850]] ACIA, through the [[serial ULA]].
  3 KB (525 words) - 20:12, 8 March 2015
• OSBYTE &9C
  OSBYTE &9C (156) - Read/write 6850 ACIA registers. If an 6850 ACIA is not used, the serial For compatability with non-6850 systems, programs should use:
  2 KB (231 words) - 20:12, 8 March 2015
• OSBYTE &E8
  {{PageTitle|OSBYTE &E8 (232): Read/Write 6850 IRQ Mask}}
  309 bytes (42 words) - 03:53, 29 December 2022
• OSBYTEs
  * [[OSBYTE &E8|&E8 232]] Read/Write 6850 IRQ Mask
  13 KB (1,639 words) - 23:56, 9 September 2023
• Serial ULA
  Computer for use in its BBC Microcomputer series. It shares the [[6850]]
  6 KB (855 words) - 23:44, 30 August 2021
• US and German variants of Model B
  | IC04 || 6850 ACIA || IC91
  5 KB (721 words) - 18:54, 28 February 2020
• Minimal boot configuration
  *IC4 - 6850 serial ACIA
  2 KB (408 words) - 14:21, 17 October 2020