SD Card disk drive for C-64?
geneb at deltasoft.com
Sun Jan 24 10:05:12 CST 2016
On Sat, 23 Jan 2016, Eric Christopherson wrote:
> How did these dumb drives interface with the computer at a software
> level? I'd think a DOS would need to be loaded somehow.
The drives had their DOS in ROM. Keep in mind that the 1541, 1571, etc.
essentially were computers unto themselves with a CPU (6502), ROM and RAM.
The host computer doesn't need to concern itself with what track & sector
the drive is reading from - it just tells the drive "send me <x>"
and the drive is smart enough to do just that.
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