Talk:Programmable interval timer

Computing Low‑importance

	This article is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of computers, computing, and information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing articles
Low	This article has been rated as Low-importance on the project's importance scale.
	This article is supported by Computer hardware task force.

Would it possible for somebody to get information on how the PIT is activated for this page?

Jatos 22:17, 3 December 2006 (UTC)[reply]

PIT does not have a separate crystal[edit]

The comment regarding about the PIT having a separate crystal is wrong. The original IBM PCs had a single 14.31818 MHz crystal (four times the NTSC colourburst rate) for everything. It was divided by 3 to get 4.77MHz for the CPU and 12 to get 1.19MHz for the PIT. Thus the exact rate is (30*525*227.5)/(1.001*3) = 1193181.8181... Hz. —Preceding unsigned comment added by 91.153.27.229 (talk) 10:41, 22 June 2009 (UTC)[reply]