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  I just rebuilt my chio with October 2 -current. Running with a
similar vintage kernel, my tape changer attached a Symbios 53c875
works now! Thank you.

...
ncr0 at pci0 dev 19 function 0: ncr 53c875 fast20 wide scsi
ncr0: interrupting at irq 10
ncr0: minsync=12, maxsync=137, maxoffs=16, 128 dwords burst, large dma fifo
ncr0: single-ended, open drain IRQ driver, using on-chip SRAM
ncr0: restart (scsi reset).
...
st0 at scsibus0 targ 6 lun 0: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 1/sequential removable
st0: st0(ncr0:6:0): 5.0 MB/s (200 ns, offset 15)
density code 0x24, 512-byte blocks, write-enabled
ch0 at scsibus0 targ 6 lun 1: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 8/changer removable
ch0: 4 slots, 1 drive, 1 picker, 0 portals

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