Boots – shoes – and leggings
Patent
1992-09-21
1995-11-07
Robertson, David L.
Boots, shoes, and leggings
36424231, 36424232, 36424233, 364DIG1, 395846, 395887, 395307, G06F 1328, G06F 1300, H01J 300
Patent
active
054653320
ABSTRACT:
In a personal computing system the function of the DMA controllers in the "AT" or "ISA" bus has been modified so that the system may select whether the 16-bit DMA channels are to be used as 8-bit DMA channels or 16-bit DMA channels. An 8/16-bit mode bit for each of the 16-bit DMA channels is written in a control register during the system Power On Self Test routine. Once the mode bit is written for each of the three 16-bit DMA channels, it may be read when the channel is active to select whether the channel is to operate as an 8-bit or 16-bit channel. With this mode bit information available, the page addressing may be selectively changed from 128k size pages to 64k size pages when a 16-bit DMA channel is to be converted to 8-bit. In addition, the byte addressing within a page may be changed from two byte addressing during 16-bit mode to single byte addressing during 8-bit mode.
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IBM Technical Disclosure Bulletin Entitled "Direct Memory Access Controller" by S. E. Edick, Mar. 1984, No. 10A, vol. 26, pp. 5199-5206.
Deloye Michael J.
Fuoco Daniel P.
Moeller Dennis L.
Asta Frank J.
International Business Machines - Corporation
Magistrale A. N.
McConnell D. E.
Robertson David L.
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