chasm@killer.DALLAS.TX.US (Charles Marslett) (06/28/89)
In article <245@hhb.UUCP>, bvk@hhb.UUCP (Brett Kuehner) writes: > Also, what is an ATR 8500? I just saw it mentioned in the new MyDOS posts, > and I'd never heard of it before. The ATR8500 is a smaller version of the ATR8000 that differed primarily in that it had (if I remember correctly) a DMA controller and an SIO chip on it rather than the acre of TTL that the 8000 used to access the disk and serial ports. As a side effect, it coul handle much higher data rates when multiple channel I/O was going on, and it had much higher RS232 baud rate accuracy and throughput (one interrupt per character, vs. several per bit with the 8000's software UARTs). The major problem is that SWP came out with it about the time they had lost the ability to provide any software support -- so it was over a year before Robert Morris and I got the RS-232 driver running, and I do not know of any attempt to use it as an SCSI disk controller. The MIO and Supra parallel bus HD interfaced pretty well killed that market anyway (since they are inherently so much faster). > Thanks, > Brett > -- > Brett Kuehner, HHB Systems, Mawah, NJ > ...!princeton!hhb!bvk > bvk%hhb@princeton.EDU =========================================================================== Charles Marslett STB Systems, Inc. <== Apply all standard disclaimers Wordmark Systems <== No disclaimers required -- that's just me chasm@killer.dallas.tx.us