From: glen@wench.ece.jcu.edu.au (Glen Harris) Subject: TECH: Sega - 2 control line version Date: Mon, 1 Jun 1992 05:32:18 GMT Message-ID: Organization: Department of Electrical & Computer Engineering, JCUNQ The modifications to convert my RTS/DTR version to RTS control only is very simple. All that needs to be done is to use the spare XOR gate as an inverter, and invert the RTS line, feeding it's output into where the DTR line used to go. The circuit is included at the end of this posting. I'll include this circuit in the circuit.lcd file in the sega.zip archive at paladine.ece.jcu.edu.au. On another note, I started implimenting RLE compression for .img files, but the only picture that turned out smaller was pacfrnt.img! All the others were up to twice as big in the compressed format. Circuit below: +VE 3 ZDDDDDDDDDDDDDDDDoDDDDDDDDDDDDDDDDDDDoDDDDDDDDDDDDDD? 3 ZDDDDDDDDDDDDDDEDDDDDDDD? 3 3 3 3 ZDDDDDDDD? 3 3 3 ZDDDDDEDDDDDDDDDD? 3 3 ZD41 8CDoD%%%%D? 3 ZDDDEDD? ZDDEDDDDDEDDDDDDDD? 3 3 3 3 3 3 R1 3 3 ZDEDDDEDDEDDEDDEDD? 3 ZDDD? 3 3 3 @DED42 7CDDDDDDDDo 3 3 3 ZDADDADDADDADDADDADDAD? 3 3 3 3 3 3 IC1 3 R2 3 3 3 3 314 13 12 11 10 9 8 3 3 3 3 3 ZDED43 6CDoD%%%%DY 3 3 3 3 IC2 3 3 3 3 3 3 3 3 3 @DDDDDDDDo 3 3 3 1 2 3 4 5 6 7 3 3 3 3 @DEDED44 5CDDDD? 3 3 3 @DBDDBDDBDDBDDBDDBDDBDY 3 3 3 3 3 @DDDDDDDDY 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 C1 === === C23 @DDDoDDEDDEDDEDDEDDY 3 3 3 @DDCOM 3 3 3 3 @DDDDDEDDo 3 @DDEDDDDDEDDDEDEDDDDTIP 3 @DDDDDDDDDDDDDDDoDDDDDo 3 @DDDDDEDDDDDEDDDEDEDDDDDMID 3 3 @DDDDDDDDDDEDDDDDDDDDDDEDDDDDoDDDEDY 3 GND 3 oDDDDDEDDDY 3 3 3 3 @DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDY RTS GND TO RS232 CONNECTOR