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RS-232C Interface for C64/C128 with RTS/CTS support Using the below schematics, flow control of rts/cts can be used instead of xon/xoff. With this dropping character problems can be minimized. Currently it's hard to access 2400bps on a C64 and 9600bps on a C128 with this adaptor. The schematics belongs to Walter Wickersham ( shadow@connected.com ).
user port RS232 DB25 DB9 description
--------- ---------- --- -----------
A & N------------------------+-----------1 & 7 5 ground
_____ I
B & C----------------[2 7]-+
[ ]
M------------------[3 1]-------------3 2 rx
[ ]
2------------------[14 4]-------------2 3 tx
[ ]
D------------------[5 8]-------------4 7 rts
___[6 11]___
|___[9 12]___|
[ ]
K------------------[10 13]-------------5 8 cts
[_____]
note: IC 7404's pins 6 and 9 are connected each other. Similarly 11 and 12. Part List Connector Views (looking at the front faces)
user port DB25 DB9
1 1 1 1
1 1 1 1 2 3 4 5 6 7 8 9 0 1 2 3 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 \-----------------------------/ \-------------/
- - - - - - - - - - - - \ . . . . . . . . . . . . . / \ . . . . . /
- - - - - - - - - - - - \ . . . . . . . . . . . . / \ . . . . /
A B C D E F H J K L M N ------------------------- ---------
1 1 1 1 1 1 2 2 2 2 2 2 6 7 8 9
4 5 6 7 8 9 0 1 2 3 4 5
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