john@wa3wbu.UUCP (John Gayman) (10/19/88)
I encountered a strange problem in trying to install a V30 chip in a Panasonic Business Partner (FX-600). The machine currently has a 8086D-2 CPU. I ordered a V30 (8Mhz) from Jameco. They advertise a Part no. UPD70116-8 which is said to replace a 8086-2. Anyway, I get the chip and it says Sony on it, with a part number of CXQ70116P-8 and says "Copywrite NEC". I put it in place of my 8086 and when I tried to boot the machine nothing came up on the monitor but my "Printer" spit out "PIT count test failed"! What gives here ? Did I simply receive a defective V30 (Why does it say Sony?) or is there some incompatibility issue that I have fallen prey to ? Any guidance is greatly appreciated. John -- John Gayman, WA3WBU | UUCP: uunet!wa3wbu!john 1869 Valley Rd. | ARPA: john@wa3wbu.uu.net Marysville, PA 17053 | Packet: WA3WBU @ AK3P
jpd@usl-pc.usl.edu (DugalJP) (10/22/88)
In article <650@wa3wbu.UUCP> john@wa3wbu.UUCP (John Gayman) writes: > > I encountered a strange problem in trying to install a V30 chip >in a Panasonic Business Partner (FX-600). ... >but my "Printer" spit out "PIT count test failed"! John, I believe your machine is telling you it failed the Programmable Interval Timer test (PIT, the 8253 chip). This happens because the V30 executes instructions faster than the 8086, leading the self-test firmware to conclude that the clock was running slow. If your system continues to boot, you should just ignore the diagnostic. If it refuses to go any further, you'll have to patch the firmware to use the V30. -- James -- -- James Dugal, N5KNX USENET: ...!{dalsqnt,killer}!usl!jpd Associate Director Internet: jpd@usl.edu Computing Center US Mail: PO Box 42770 Lafayette, LA 70504 University of Southwestern LA. Tel. 318-231-6417 U.S.A.
berger@clio.las.uiuc.edu (10/22/88)
That's the right part number. I wouldn't be surprised to hear that Sony is second-sourcing the chip. Many microcomputers have software timing loops built into the ROM. I've encountered problems with disk boot procedures for that reason. Its possible that your power-on printer diagnostic check has similar troubles. Mike Berger Department of Statistics University of Illinois berger@clio.las.uiuc.edu {convex | pur-ee}!uiucuxc!clio!berger