HD63265 Floppy Disk Controller Users Manual 2ed Mar89 - Bitsavers
HD63265 Floppy Disk Controller Users Manual 2ed Mar89 - Bitsavers
HD63265 Floppy Disk Controller Users Manual 2ed Mar89 - Bitsavers
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9.6.2 68-Series 8-Bit Bus SystemFigure 9-15 shows a typical FDC interface circuit for a HD64B180-based 68-series8-bit bus system.HD 6 4B 180 To memory circuit Address decoder <strong>HD63265</strong>(FDC)(LS138)~ __ ~A CSAo~ AI8 !Address BusAo'"'"' A7 = ) yv[)~----_---------::J---DACK1---t----aGDo~D7 (Data Bus Do~D7WRE r'I_Ao~-------------------~----------iRS: R/W logic is inverted betweenU:1PU mode and DMA mode") Do~D7vE~J~"-]---=~'"- I C~rtu1Y 11------1 R/WSelection IDMRQD-------------------------+---+---------a DREQr DENDTENDO-----~:~I=n~6~8---s-e-r-ie~s-,~H-D-6-3-26-5~'-S~I~R~Q~;----+-5--------~I-N-T 0--------'=: =P;...:l=· n=i=s:.=.;a=n=o~p=e:.=n=-=d~r=a:.=in=o::.::u=t:..;P=u=t=f~'---:::::.--=-.:=-----_-___ ~ĪRQf'RESO-----------~l---------------~-------------u RESET+5 _J
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