It has two RCA-style jacks and a 9-pin connector
<p>
It has 5 biggest chips of the same size.<p>
Two of them say:
<blockquote>
1501458<font size="-1">8625E</font><br>
TC15G022AP-0013<br>
IBM CORP. 1984
<p>
</blockquote>
And there is one each of 
<blockquote>
1501456<font size="-1">8623E</font><br>
TC15G022AP-0014<br>
IBM CORP. 1984
<p>
1501459<font size="-1">8625E</font><br>
TC15G008AP-0023<br>
IBM CORP. 1984
<p>
AMI 8622MBV<br>
1501457<br>
CO4947
<p>
</blockquote>

A somewhat smaller chip in a socket is
<blockquote>
AMI 8624MAL<BR>
6277356
</blockquote>

A little metal covered chip is labeled
<blockquote>
|\/|970<br>
P C 8616<br>
16. 257000MHz
</blockquote>