Addi-Data interface cards. APCI-1500 I/O and APCI8001-Stepper-Controller-Card

Possibly...

The 1500 looks like a simple IO card, so can probably be used with just a HAL driver modelled after the similar PCI8255
github.com/LinuxCNC/linuxcnc/blob/master...l/drivers/pci_8255.c
(And I have just noticed that there is no documentation for this driver)
Also, very similar, also 8255 based (not sure if yours is)  but based on the ISA bus, so not directly usable
github.com/LinuxCNC/linuxcnc/blob/master...rivers/hal_ax5214h.c
Which does have docs, though not really much help with modifying the driver for your card
linuxcnc.org/docs/stable/html/drivers/ax5214h.html


For the 8001 it is less clear. It might be a bit too clever, but if the card is happy to be sent a position update for each axis every 1ms then a simple HAL driver should be able to make it work.
ie, take the three joint.N.motor-pos-cmd pins from HAL and output them as step pulses (or servo drive based on encoder feedback, or whatever else it can do)
The STMBL drive works like this.