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- Debug Console:
- --------------
- USART1: (Rx:DMA1/5, Tx:DMA1/4)
- PA9 TX
- PA10 RX
- USB:
- ----
- PA11 USB_DM
- PA12 USB_DP
- GPIO: (GPI_float, GPO_pushpull)
- PA0 (connect via 1.5kohm to PA12/USB_DP)
- Floppy:
- -------
- GPIn: (GPI_float, active low)
- PB6 8: IDX
- PB7 26: TRK0
- PB8 28: WRPROT
- GPOut: (GPO_opendrain or GPO_pushpull)
- PB9 2: DENSEL
- PB10 12: SEL_A
- PB11 16: MTR_A
- PB12 18: DIR
- PB13 20: STEP
- PB14 24: DKWE
- PB15 32: SIDE
- TimerIn: (GPI_float, active low)
- PB3 30: DKRD (Timer2/2, CC2:DMA1/7)
- TimerOut: (AFO_opendrain or AFO_pushpull)
- PB4 22: DKWD (Timer3/1, UP:DMA1/3)
- Unused Pins:
- ------------
- All to be pulled high:
- PA1-8,13-15
- PB0-2,5
- PC0-15
- Floppy bus connections:
- -----------------------
- Inputs: Pull to 5v via 1k.
- Outputs: Drive open-collector 2N3904, 1k base resistor.
- IBM/PC 34-pin Floppy Host Interface:
- ------------------------------------
- 2: -> DENSEL(5.25: HIGH=360rpm/high-density, LOW=300rpm, low-density)
- 3: missing/key
- 4: n/c
- 6: n/c
- 8: <- INDEX
- 10: -> MTR_B
- 12: -> SEL_A
- 14: -> SEL_B
- 16: -> MTR_A
- 18: -> DIR
- 20: -> STEP
- 22: -> DKWD
- 24: -> DKWE
- 26: <- TRK0
- 28: <- WRPROT
- 30: <- DKRD
- 32: -> SIDE
- 34: <- DSKCHG / RDY(5.25)
- All odd pins are ground.
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