SD Card disk drive for C-64?

geneb geneb at
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.


Proud owner of F-15C 80-0007 - The only one of its kind. - Go Collimated or Go Home.
Some people collect things for a hobby.  Geeks collect hobbies.

ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes. - Get it _today_!

More information about the cctalk mailing list