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NEC PowerMateSX Compatible ISA Video Cards?

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    NEC PowerMateSX Compatible ISA Video Cards?

    Hello, I've come into possession of a NEC PowerMateSX. Pretty much a dumpster rescue. Unfortunately the machine has been stripped of all it's cards so I'm looking around at the available video cards on ebay etc. I used to work on these types of machines back in the day, but it's been awhile, would you say any old ISA video card would do? Or is there some NEC voodoo to be wary of? Thanks for your help.



    I think that this is the motherboard:

    And here is the jumper manual:

    So, you should be able to use any ISA video card, MDA, Hercules, CGA, EGA, VGA, or other.

    - Alex


      Thanks Alex! Much appreciated.


        I've got a Powermate 1 in a similar form factor, but it's a 286. It had some generic EGA card in it and I put a VGA card in it because I wanted to do troubleshooting with an LCD instead of lugging around a big CRT. It worked fine.

        My concern for you would be that it looks like it requires a RAM board that isn't in that system, based on the second link that Alex posted, and also the weird first slot. I'd expect a 386SX to use a 16bit memory card though, just like a 286, so maybe the RAM board isn't proprietary? Sometimes 386DX machines used special 32 bit memory cards. Can you tell if any of the chips on the motherboard are RAM?


          jafir you raise a great point. I've been reading over the other PowerMate threads on the forum and it never occurred to me that the RAM isn't on the motherboard, and this daughterboard didn't come with my system! My "spidey-senses" kept going off about ram, but I didn't piece that together until you said so.

          With that being said, I guess I'll keep my eye out for a memory card. I forgot to mention in my original post above that it did come with a WD1006-WAH 16-Bit ISA Storage Controller Card, so at least it has that going for it


            Now I'm not so sure, because I do see something that looks like ram on the mobo (upper right-hand corner):

            NEC PowerMateSX Mobo.PNG

            And here's the daughtercard:

            NEC PowerMateSX Daughter.PNG


              Originally posted by VeryVon View Post
              And here's the daughtercard:
              So is that the CPU on the daughtercard?


                Originally posted by T-R-A View Post

                So is that the CPU on the daughtercard?
                Correct, N80387SX-16 FPU and 80386SX-16 CPU



                  Likely any "generic' EGA/VGA would work, at least to see if it would boot. But given that it was a salvage machine, I'd have a good check of the P/S before I'd even try that. Then check out that nothing is an issue on the MoBo. All you need to boot is (working) RAM and a way to output data (video). I'd suspect even then it's gonna complain about something... likely CMOS configuration and dead battery.
                  Last edited by T-R-A; October 29, 2021, 01:02 AM.


                    After looking around, I found this (which I strongly suggest you watch):



                      T-R-A great video, very appropriate to the thread.

                      A couple take-aways from the video:
                      1. NEC machines of this type were non-standard / proprietary (this is a pretty big generalization tho', a real NEC expert would have to weigh in on that)
                      2. We all love projects that are a challenge, but if the endeavor doesn't bear fruit, it can be a downer!
                      This video helps me set expectations for this machine. It also had me wondering about availability of source code and "open" versions of thing like DOS CDROM drivers that would give more debugging information when things don't work like the issue in the video, because I see in the unix/linux world how people roll up their sleeves looking at hexdumps and create scripts or driver modifications around low-level issues when bit streams don't sync up. I'm certainly not talented enough to do such things, but I wonder if those options are available for situations like in the video (I'll have to google the "open source" thing in regards to vintage pc / dos.)


                        Originally posted by VeryVon View Post
                        NEC machines of this type were non-standard / proprietary (this is a pretty big generalization tho', a real NEC expert would have to weigh in on that)
                        Indeed. Had a SX20 Powermate for just a few months. Didn't really get to know much about it since the (underrated) P/S blew so quickly.


                          Originally posted by T-R-A View Post
                          After looking around, I found this (which I strongly suggest you watch):

                          I own that computer in the video still have not got the CD-Rom working..
                          I'll pull the video card and tell ya the spec's..
                          Never Bin or sell your old computer's you will regret it!!
                          Vic 20 x3,C64 x2,128D,C128 flat deck,A1000 x2,A500 x3,A2000,A600,A1200,Apple ][e,2x Apple][ GS rom 01,03,Apple ][c x4 with only 1 PSU,2x Laser 128EX EX2,Atari 600XL,2x 800XL,130XE w/320 mod With a MyIDE plus,Atari 1040stf w/2.5meg..