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Home / WebSurfer Areas / WebSurfer Technical Info Reference (MODERATED) Adding the COM1 port

Adding the COM1 port (modified 0 times) hardware1 Adding the COM1 port (if you want to): "U17" is either a LGS GD75232D or HT6571. A 75232 is a common chip. You simply put one in "U10" and add the connector header. The connector CN18 is pinned exactly like any serial card, just plug it in and go! Caps are not needed for it to function, unless you are worried about FCC or long cable runs. You may find the chips on dead serial cards at the swapmeet. www.digikey.com This would be great for uploading MP3's. Pic of cable pluged in: http://linux-hacker.net/websurfer/images/ide-resistors1.jpg USB ZIP drive would be better, but this is nice. 05-01-2000 03:57:42

RE:Adding the COM1 port (modified 0 times) Dr. Ion Cool. U17 would be an excellent chip to include in a WS-MOD-3, for those of us with a fine-tipped iron, but not enough stuff for a Digi-Key order. 05-01-2000 09:06:34

RE:Adding the COM1 port (modified 0 times) Particle+Man How about a source for these things? I cannot find any electronics distributors that carry them and will sell me small quantities (I can get 1000 of them if I specal order from digikey) I would try and cannabalize a card (if I could find one with that chip!) but you run a 60% chance of killing it during chip extraction.. SMD were not designed for rework or salvage in mind. 05-05-2000 08:49:42

RE:Adding the COM1 port (modified 0 times) Vlad My WebSurfer has U17 but is missing U10. Is that how they are all configured? So if I understand correctly, U10 needs to be populated to enable COM1. In that case what function does U17 serve? 05-05-2000 20:57:29

RE:Adding the COM1 port (modified 0 times) greghol TI 75185 works just fine at U10. Also, dont use a std 10 pin header to DB9 cable assembly with the WSP. The assembly needs to be connected so that, Header pin 1 goes to DB9 pin1, 2 to 2, 3 to 3 etc etc. Pin 10 on both are not used. The normal assy that is used in most MBs are Header - DB9 1 - 1, 2 - 6, 3 - 2, etc. You will see the pattern. You mod one of these if the hood is not molded. The caps are about 330pf. Not needed unless you have a long cable. Greg 05-10-2000 16:59:52

RE:Adding the COM1 port (modified 0 times) Dr. Ion When hardware1 said that these chips are common, he wasn't kidding! Just for laughs, I dug up some old cards... 486 motherboards, Vesa Local-Bus (!) serial/ide cards, they *ALL* had the GD75232 parts on them. (Some with Goldstar parts, before they were even Lucky-GoldStar. A little heat-gun, a little solder, and my WSP has the COM port as nature intended. The hardest part was solder-sucking the 10 holes. 05-11-2000 15:41:49

RE:Adding the COM1 port (modified 0 times) Dr. Ion Like Vlad said, what is U17 used for in the WSP? I can't see anything obvious that needs RS-232 levels. Maybe the IR keyboard? Doubtful. Has anyone tried moving U17 to U10 and seeing what breaks? 05-11-2000 15:50:34

RE:Adding the COM1 port (modified 0 times) hevnsnt Well you all suck... I dug through all the boxes and this is what I found: Goldstar GD75188 GD75189a Unknown MC1488 MC1489 Anyone know if these will work? 05-21-2000 23:24:58

RE:Adding the COM1 port (modified 0 times) Aluminum Gerbil I highly doubt that those would work, those numbers dictate the type of circuitry inside the chip. You could seriously FUBAR something by just soldering in random resistor packs... Aluminum Gerbil BTW is this HeVnSceNt from SOTMESC? What happened to your site yo? 07-13-2000 23:22:10

RE:Adding the COM1 port (modified 0 times) feslog Profile U17 is used for the optional smartcard reader interface. Connector CN16 provides some the following signals (as taken from the STB1030 manual: 1 VCC 2 COM2TX 3 COM2RX 4 COM2CTS 5 COM2RTS 6 ICCRST 7 GND 8 NC With a custom connector, you can add a second *limited* implementation RS-232 port. It came in handy for my application... 03-19-2001 17:06:11

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