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Continuation on connecting the floppy drive to the ZX 10x10 can be seen here • Connecting the floppy drive to the ZX 10x10. Hour... Alexander Karnaukh's Spectrum Store https://www.olx.ua/list/user/5MXR2/ Combined firmware for ROM 27512: Bank 0 - Empty. Bank 1 - TR-DOS Version 5.5H Copyright (C) 1993 by Rst7. Bank 2 - SOS 128k (Standard OS for "ZX Spectrum" 128k). Bank 3 - SOS 48k (Standard OS for "ZX Spectrum" 48k). http://www.cxemateka.ru/v1/27512.bin Assembling the floppy drive controller • Assembling the BDI constructor.