wouk@duke.UUCP (Arthur Wouk) (12/09/85)
I am posting this for a friend who does not have net access. Please respond to me by email. I would like to upgrade my PCjr from 256K to 640K by replacing the 64K RAM chips in my Tecmar jrCaptain with 256K chips. The Tecmar documentation says that this is possible, provided you have the older jrCaptain that has sockets for the RAM. Recently, Tecmar has told conflicting stories to callers on their hotline. In one story, Tecmar says that the 256K chips will overheat and possibly damage the jrCaptain board along with themselves. Tecmar's solution is to buy a jrCadet board ($153.00, fully populated) to piggy-back onto the jrCaptain. In the other story, Tecmar says that the 256K chips will not overheat or damage the jrCaptain. They will, however, fail because they are only "commercial grade" (if bought through the usual mail-order sources) rather than the "industrial grade" that Tecmar uses. Tecmar's solution -- buy a jrCadet. What is the correct story? Also, are there advantages to using CMOS RAM chips? Does anyone have experience upgrading a PCjr?