UP9600
UP9600 is a 9600 baud device driver or KERNAL adapter for RS232userport interfaces with special cabling.
The circuit is not compatible with the C64 mode of the C128!
9600/19200 bps RS-232C for C64/C128 with RTS/CTS support[edit | edit source]
Using Daniel Dallmann's hack of 9600bps interface method, and a 7404, one can use a high bps external modem with a stock C64. This interface includes rts/cts flow control and 9600bps hack. So it can use 19200 with proper rts/cts timings. Only one IC and two connector is required. Thus, it is easier and cheaper method to go up 9600bps. Nick Rossi's Novaterm 9.6 and Daniel Dallman's miniterm programs support this 9600bps hack.[1]
user port RS232 DB25 DB9 description
--------- ---------- --- -----------
A & N------------------------+-----------1 & 7 5 ground
_____ I
B & C & 7------------[2 7]-+
[ ]
2------------------[14 1]-------------3 2 rx
[ ]
M & 5----------------[3 4]-------------2 3 tx
[ ]
D------------------[5 8]-------------4 7 rts
[ ]
6 __ ___[6 11]___
L __| |___[9 12]___|
[ ]
K------------------[10 13]-------------5 8 cts
[_____]
note: IC 7404's pins 6 and 9 are connected each other. Similarly 11 and 12. User port's pins 6 and L connected each other.
Part List 7404 IC (you can easily find it) DB25 male connector (or DB9 male) User Port connector 2m. 2 line shielded cable. (you don't need this if your modem has the cable)
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
