MicroVAX 2000

that there is a resistor board installed to provide a load comparable to the drive on the power supply. According to a rather sketchy spec sheet that I d/l'd from DEC, it can handle a maximum 318mb local disk. Based on the 53C80 chip installed, I presume that the drive should be SCSI. > Not exactly, the SCSI port is only for a tape drive, a TK50Z (an early ancestor to modern DLT drives). A uVAX 2000 uses MFM drives, either a Microplis 1325/DEC RD53 (70MB) or a Maxtor 2190/DEC RD54 (159MB). In order to load VMS you really need the RD54, 70MB is too small. The HD controller is the 40 pin SMC chip on the motherboard. Oddball MFM format, not compatible with WD HDCs, but the 2000 has a formatter in the ROM. The 318MB figure comes from using two RD54 drives (159 each). 25-pin, 15-pin, and 9-pin. What are their functions? The 15 and 9 are presently encumbered by a plugin box that has three RJ45(?) connectors. Network link? > The 25 pin is the TTA2 port, RS423 (close to RS232) with full modem support (sort of). The 9 pin is TTA3:, another RS423 serial port for a local printer or terminal, but not wiored like a PC 9 pin serial. The 15 pin is for a workstation cable and carries the video (the coax connector on the little box), plus a keyboard and mouse connector (TTA0: and TTA1: serial ports). They are not RJ45s. You should also have a BNC coax connector for 10Base5 thinwire ethernet. For more info check the comp.os.vms and comp.sys.dec newsgroups, they have lots of FAQs for uVAX 2000s. I don't know the URLs but if you post a question on one of the ngs they will direct you to the web page. BTW, I might have an expansion memory board left for a uvax 2000, i'll check the old DEC scrap box. IIRC it brings one up to either 8 or 14MB of RAM. (a uVAX II maxes out at 16MB of RAM) Jack Peacock