The original 1050 Turbo highspeed code had a check in there so that only D1: was accessed in 1050 Turbo mode. If you wanted Turbo mode also on D2: or higher you had to change this manually. Here's a code snippet of the highspeed routine: 0122 LDA $023A 0125 CMP #$32 0127 BCS $014BIIRC TurboDos had some special autoexec commands so you could enable 1050 Turbo mode on other drives automatically on boot. But I never used this as I only had a single 1050 Turbo.  I'd suggest the SIO2SD code should
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