Um8272
From Citylan
Floppy Disk Controller
Pinout
DIP40 +---\/---+ RESET | 1 40| Vcc *RD | 2 39| *RW/SEEK *WR | 3 38| LCT/DIR *CS | 4 37| FR/STP A0 | 5 36| HDL DB0 | 6 35| RDY DB1 | 7 34| WP/TS DB2 | 8 33| FLT/TRK0 DB3 | 9 32| PS0 DB4 |10 31| PS1 DB5 |11 30| WDA DB6 |12 29| DS0 DB7 |13 28| DS1 DRQ |14 27| SEL *DACK |15 26| MFM TC |16 25| WE IDX |17 24| VCO INT |18 23| RD DATE CLK |19 22| RDW GND |20 21| WR CLK +--------+
Frequency
DIP40
Set reader to FREQ, put black probe to GND, red probe to 19 to measure CPU clock
External links
Files
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UM8272 Datasheet