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810622 Dandilion RS232 DMA Problems

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Descr: xerox sdd memos_1981 810622_Dandilion_RS232_DMA_Problems.pdf
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810622_Dandilion_RS232_DMA_Problems.pdfDate: 22 June 1981 1:14 pm PDT (Monday) From: Ogus.PA Subject: Dandelion RS232C DMA problem To: Wick. Lauer cc: Schwartz, Danielson, Garlick, Hutson, Charnley, DDavies, Yamanaka, Ogus I am forwarding Dan's message which sums up the findings of his RS232C DMA testing. Basically, due to an (undocumented) incompatibility between the Zilog SIO chip and the Intel DMA controller, it is not possible to reliably implement DMA transfers in the current system. There are two problems (see below), the first of which could perhaps be worked around in software. The second is not possible to fix reliably. Dan lists four approaches to attempt to obtain 56 kbps data ratcs. The first (Dan's #2) is to attempt to do so without using the Dma controller. using the current interrupt mechanism. The current code could be streamlirt(;u. and perhaps unnecessary function 1emoved throui:;h the use 0,' overlays. This would work with with the current hardware. all would be the quickest soluton to t

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