Included in 7.5.2 Printing Update. Fixes problems while printing on serial printers and improves overall performance of the serial port on AV and PowerPC based Macintosh computers, except 5200, 5300, 6200, and 6300 series. Requires System 7.5 or later. Version 2.0.2 of this extension is simply version 2.0 of this extension plus a couple of additional fixes and support for the new PCI Power Macintosh computers (7200, 7500, 8500, and 9500). Version 2.0 of this extension was a complete rewrite of the DMA serial driver which originally accompanied the Centris 660AV, Quadra 660AV & 840AV, Power Macintosh 6100/60, 6100/66, 7100/66, 7100/80, 8100/80, 8100/100, and 8100/110. It also supports the various Performa and Apple Workgroup Server products derived from the models listed. The SerialDMA driver is a replacement for the standard set of Macintosh serial device drivers referred to by their driver names: '.AIn,' '.AOut,' '.BIn,' and '.BOut.' SerialDMA is applicable only to the set of Macintosh models which incorporate DMA channels servicing the standard Z8530 Serial Communications Controller. The original serial driver for these products suffered from occasional system hangs, communications timeouts, poor communications performance, and various other glitches.Do not install SerialDMA if you are running System version 7.5.3 or above.
