On 1/7/19 9:02 PM, Mike Stein wrote: > > The alternative of turning on the motor with the DS signal would mean delaying access until the motor came up to speed; imagine disk-to-disk copy with relatively crude belt-driven motors starting and stopping with every access... Well, a proper disk-2-disk copy doesn't switch drives after each block or file, it reads as much as it can into memory and then writes it out again. > It's so easy to sit back and criticize the decisions and choices made in the distant past without fully taking into account the constraints that influenced them. Most of the stuff on the PC was 'has to be cheap'. That's why they used the 8088 and not the 8086, clocked it at 4,77 MHz (which is the NTSC color crytsal, 14,318 MHz divided by 3) and made a few other questionable decisions like active high IRQ lines. GerritReceived on 2019-01-08 13:00:03
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