KR1818VG93 USSR Soviet Russian Clone of WD FDC1793 Beta disk Controller for ZX-Spectrum TR-DOS

Great items for chip collectors !!!
 
 Ultra RARE Russian Soviet Clone of Western Digital FDC1793 (Floppy Disk Controller)

IC from the Old Stock, in working order.

KR1818VG93 - (40-pins, Kvazar plant, 1994) USSR Segmented Plastic clone of WD FDC1793 (Floppy Disk Controller)
 
Often used in Beta-disk ZX-Spectrum Floppy Controller for TR-DOS

en.wikipedia.org/wiki/Beta_Disk_Interface

Also for more information You may visit -  en.wikipedia.org/wiki/Western_Digital_FD1771 

IC from the Old Stock, in working order.