Great Hierophant
Veteran Member
Serial UART Type - 8250, Model 25 planar shows discrete 8250 chip.
Parallel Port - Unidirectional or Bidirectional?
I read that the floppy adapter does support the high density drives.
Any possibility of connecting a real speaker instead of the beeper on the 30? The 25 has an earphone connector.
IRQs and DMAs - Up to 7/3, as the 8525 has one 8237 DMA controller on board. If only 7/3, what IRQ does the mouse port use? My guess is 3. 0 for the System Timer, 1 for the Keyboard, 2 available (for video), 4 for the Serial, 5 for the Hard Drive, 6 for the Floppy Drive and 7 for the Parallel Port. DMA 0 for the RAM refresh, DMA 1 for the Hard Drive, DMA 2 for the Floppy Interface, DMA 3 free. Can any of this stuff be changed or disabled?
Parallel Port - Unidirectional or Bidirectional?
I read that the floppy adapter does support the high density drives.
Any possibility of connecting a real speaker instead of the beeper on the 30? The 25 has an earphone connector.
IRQs and DMAs - Up to 7/3, as the 8525 has one 8237 DMA controller on board. If only 7/3, what IRQ does the mouse port use? My guess is 3. 0 for the System Timer, 1 for the Keyboard, 2 available (for video), 4 for the Serial, 5 for the Hard Drive, 6 for the Floppy Drive and 7 for the Parallel Port. DMA 0 for the RAM refresh, DMA 1 for the Hard Drive, DMA 2 for the Floppy Interface, DMA 3 free. Can any of this stuff be changed or disabled?