EXHIBIT 5.01

                                  November 12, 1996

Radius Inc.
215 Moffett Park Drive
Sunnyvale, California 94089

Gentlemen/Ladies:

    At your request, we have examined the Registration Statement on Form S-1 
(the "REGISTRATION STATEMENT") filed by you with the Securities and Exchange 
Commission on September 20, 1996 in connection with the registration under 
the Securities Act of 1933, as amended, of (i) 750,000 shares of Series A 
Convertible Preferred Stock of Radius (the "SERIES A PREFERRED"), (ii) 
warrants to purchase 800,000 shares of Common Stock of Radius (the 
"WARRANTS"), (iii) 36,372,198 shares of Common Stock of Radius (together with 
the Series A Preferred and the Warrants, the "OUTSTANDING SECURITIES"), (iv) 
up to 6,075,333 shares of Common Stock of Radius issuable upon conversion of 
the Series A Preferred (the "CONVERSION SHARES"), (v) up to 800,000 shares of 
Common Stock of Radius issuable upon exercise of the Warrants (the "WARRANT 
SHARES"), (vi) up to 11,046,060 shares of Common Stock of Radius issuable 
pursuant to Rights issued by Radius on September 13, 1996 (the "RIGHTS 
SHARES"), and (vii) shares of Common Stock of Radius having a market value of 
up to $600,000.00 which may be issued by Radius in lieu of cash dividends on 
the Series A Preferred (the "DIVIDEND SHARES").

    In rendering this opinion, we have examined the following:

    (1)  the Registration Statement, together with the Exhibits filed as a part
         thereof;

    (2)  the Prospectus prepared in connection with the Registration Statement;

    (3)  the minutes of meetings and actions by written consent of the
         shareholders and Board of Directors which you have provided to us;

    (4)  the shareholder lists dated July 29, 1996 and September 30, 1996 
         you have provided to us, and a list of holders of stock options 
         dated as of October 28, 1996 you have provided to us; and

    (5)  The Articles of Incorporation of Radius, as amended through September
         6, 1996 and the Bylaws of Radius, both as certified by Radius on
         November 12, 1996.

    In our examination of documents for purposes of this opinion, we have
assumed, and express no opinion as to, the genuineness of all signatures on
original documents, the authenticity




Radius Inc.
November 12, 1996
Page 2


of all documents submitted to us as originals, the conformity to originals of
all documents submitted to us as copies, the lack of any undisclosed
terminations, modifications, waivers or amendments to any documents reviewed by
us and the due execution and delivery of all documents where due execution and
delivery are prerequisites to the effectiveness thereof.


    As to matters of fact relevant to this opinion, we have relied solely upon
our examination of the documents referred to above and have assumed the current
accuracy and completeness of the information and records included in the
documents referred to above.  We have made no independent investigation or
other attempt to verify the accuracy of any of such information or to determine
the existence or non-existence of any other factual matters; however, we are not
aware of any facts that would lead us to believe that the opinions expressed
herein are not accurate.

    Based upon the foregoing, it is our opinion that:

    1.   The Outstanding Shares are legally issued, fully paid and
nonassessable; and

    2.   Each of the Conversion Shares and the Dividend Shares, the Warrant
Shares and the Rights Shares when issued in accordance with the terms of the
Series A Preferred, the Warrants and the Rights, respectively, and in the manner
referred to in the Prospectus associated with the Registration Statement, will
be legally issued, fully paid and nonassessable.

    We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to all references to us, if any, in the
Registration Statement, the Prospectus constituting a part thereof and any
amendments thereto.

    This opinion speaks only as of its date and is intended solely for the your
use as an exhibit to the Registration Statement for the purpose of the above
sale of the securities described above and is not to be relied upon for any
other purpose.

                                  Very truly yours,
                                  /S/  FENWICK & WEST LLP