S[0-3] - FDC3 D[0-3] - FDC3 Ex - EPROM K[0-7];boot from ?? (Kx) (via APK on ports 24-27h) x = 0-7
S[0-3] - FDC3
D[0-3] - FDC3
Ex - EPROM
K[0-7];boot from ?? (Kx) (via APK on ports 24-27h) x = 0-7