At Mon, 17 Apr 2000 14:16:11 +0900 (JST),
nisimura@itc.aist-nara.ac.jp (Toru Nishimura) wrote:
> I guess Vr4100/TX3900 has CU1 bit in status register as hardwired
> zero, right, or wrong?

Document says:

VR4100	RFU. Write 0 in a write operation.
TX3900	Read/Write

Actual implemetation may be hardwired to 0, but you should not expect
that CU1 bit is hardwired.

---
Shuichiro URATA
ur@a-r.org