* The '''I/O addresses are unknown.'''
* The '''clock frequency is unknown''' (as shown on the photo, it uses an oscillator, ie. NOT the 4MHz signal on the expansion port).
Port '''????'''h READ:
bit'''?''' Status 1 (0=Speech Busy, 1=Ready/Halted) (SBY Pin, Speech Busy)
bit'''?''' Status 2 (0=Ready to Receive Data, 1=Busy) (/LRQ Pin, Load Request)
bit'''?-?''' Not used (garbage, probably usually highz)
Port '''????'''h WRITE:
bit7-6 Reserved (should be be zero, though SP0256 Pins10-11 are GNDed)
bit5-0 Allophone number ;data can be send when Status.Bit'''?'''=0
* [[SP0256]]
* [[SP0256 Voice Generator]]
* [[SP0256 Instruction Set]]
* [[SP0256 Allophones]]
* [[SP0256 Pin-Outs]]
== Supported software ==