sullivan@marge.math.binghamton.edu (fred sullivan) (09/09/88)
Rather than giving our department some money which we could spend sensibly, our dean recently bought us a PS/2 model 50 with an extra serial board (which has 2 ports - both with db9 connectors). We can't get the serial board to work with an AT cable. Our theory is that Big Blue changed the pin assignments. Is this the case? If so, does anyone know the new pin assignments? Or where we can buy a cable? Or do we just have a bad card? Fred Sullivan SUNY at Binghamton Dept. Math. Sciences Binghamton, NY 13903 sullivan@marge.math.binghamton.edu First you make a roux!
mason@tc.fluke.COM (Nick Mason) (09/12/88)
In article <1410@bingvaxu.cc.binghamton.edu> sullivan@marge.math.binghamton.edu (fred sullivan) writes: >We can't get the serial board to work with an AT cable. Our theory >is that Big Blue changed the pin assignments. Is this the case? If >so, does anyone know the new pin assignments? Or where we can buy a >cable? Or do we just have a bad card? HI. Well, the pin assignments are not changed. The first thing to check is what serial port(s) is the serial board configured for? On a PS/2, the serial ports are configured using the reference disk that came with the machine. Note: If you have a PS/2 50 and the Dual async serial board you have 3 serial ports. The one on the mother board (25 pin) and 2 on the async board (both 9 pin). These ports can be configured as SERIAL_1 to SERIAL_8 (yes, 8 serial ports even though DOS only supports 4), in any arbitary order. .ie. the port on the mother board could be SERIAL_8, not SERIAL_1 as you would hope. Also note that SERIAL_1 uses hardware interrupt level 4, and ALL OTHER SERIAL LINES SHARE (yes share) interrupt level 3. This may not be compatible with your software. If the above doesn't solve your problem then you may have a bad board. GOOD LUCK. Nick Mason/ms272G/John Fluke Mfg Co/Box C9090/Everett WA 98206 USA mason@tc.fluke.COM UUCP: {{cornell,decvax,sdcsvax,tektronix,utcsrgv}!uw-beaver} \ {microsoft,gatech!sb1,hplabs!lbl-csam,decwrl!sun,sunup} - !fluke!mason {ssc-vax,hplsla,wavetek,uw-vlsi,tikal} / ARPA: fluke!mason@uw-beaver.ARPA BITNET: "fluke!mason@uw-beaver.ARPA"@PSUVAX1.bitnet "Avoid the Dull and Ignorant"
dts@cloud9.UUCP (Daniel Senie) (09/13/88)
In article <1410@bingvaxu.cc.binghamton.edu>, sullivan@marge.math.binghamton.edu (fred sullivan) writes: > Rather than giving our department some money which we could spend > sensibly, our dean recently bought us a PS/2 model 50 with an > extra serial board (which has 2 ports - both with db9 connectors). > > We can't get the serial board to work with an AT cable. Our theory > is that Big Blue changed the pin assignments. Is this the case? If > so, does anyone know the new pin assignments? Or where we can buy a > cable? Or do we just have a bad card? > There are two possibilities: 1. The PS/2 Model 50Z is really screwed up when it comes to serial ports. It seems some brilliant person at IBM decided to change where all of the I/O port mappings are or some such. The other possibility is that you have just a regular PS/2 Mod. 50. The Dual Async adapter from IBM for the MicroChannel is kinda wierd. Make sure you get the right port for COM2. COM3 is virtually unusable, as the I/O address (as shown in the BIOS in-memory tables) is 3220 Hex. Most comm software does not understand this. I have not gone hunting to see what interrupt they wired it to yet. Buying from IBM seems to be getting riskier by the day... Good Luck. -- Daniel Senie UUCP: harvard!ulowell!cloud9!dts Stratus Computer, Inc. ARPA: anvil!cloud9!dts@harvard.harvard.edu 55 Fairbanks Blvd. CSRV: 74176,1347 Marlboro, MA 01752 TEL.: 508 - 460 - 2686