It would be interesting to benchmark it against AC's EISA system. I think his memory scores were more in the PCI-486 range. AC system is better, SIS chipset is faster than the OPTI one. Unfortunately I only got this Eisa board. Imho my system performances are acceptable only at 50mhz bus speed, at …

Indeed it's slower but it's also true that the mainboard is from 1992. As I said before using the system feels quite responsive even if the scores are not on par with PCI systems, it's a pleasure to use it and it feels more like a PCI system than a Isa system. I don't use win9x or nt on such builds, …

The various results at different speeds under speedsys. https://i.imgur.com/4VtNdrk.jpg https://i.imgur.com/wyC9ayR.jpg As you can see with this bios release and with the amisetup limited adjustable settings 50x2 gives the best overall results. In the previous post I mistook the 120mhz CPU score …

feipoa wrote: Interesting. Anonymous Coward, didn't you witness the opposite result on your EISA board, that is, BTB worked in DOS but not LSSER? For stable I mean no hangs or strange behaviours at least for 6 or more hours of use: games, benchmarks and so on.

I didn't try the CPU at 3x33, I only tested it at 2x50 and 3x40 and it's not stable even with only branch prediction enabled and loop disabled, but it's very stable with btb=off and loop=on plus the other enhancements written above. The same CPU works fine in Dos with branch prediction enable on a …

@Anonymous Coward I will post the deatiled results for both speeds, but I'm quite sure difference is minimal. @feipoa LSSER = 0 works well while Branch Prediction is not stable even with RSTK and LOOP disabled, enabling Linear Burst crashes the system immediately. I tried to set the IBM 5x86c at …

I managed to acquire an Upgrade Socket3 with VRM, I tested the IBM 5x86c 100 at 40x3 and 50x2, the 50x2 wins for memory bandwith even with slower timings. The result are quite nice and the 50x2 config doesn't differ much from the AMD 50x3. I successfully used the following 5x86 enhancements: ● RSTK_ …

I have 2x IBM 5x86-100 but no interposer with VRM for them, I have tested on this board an Intel 486dx4-100 overdrive and of course it works, but @33mhz bus it doesn't shine like the Am5x86-P75 @50mhz, I should try it at 40x3. I will post some results in the next hours.

I think you will be sorely disappointed with any BIOS from an Acer system. I have an Acerpower EISA active backplane board (J3) with a dual P60 card (it can also take a 486 card). The BIOS is from 1993 or 1994, but it's some proprietary acer crap. It's not an OEM job from phoenix or award. The …

Cool, I didn't know that these were officially rated for 50MHz. The memory performance numebrs look alright. I used to have one of these, but I wanted more support for cache and RAM so I sold it and got some SiS boards. Another thing that kind of bothered me is that these TMC boards strangely lack …

I have recently acquired this board and took some pictures of the test bench I have arranged with it, I know there are some supporters and experts of 486 EISA Systems on this forum, so I hope to receive suggestions and comments about it. https://i.imgur.com/NPeZXiM.jpg It's a TMC PET48PN Rev.1.0, an …

Got this a couple of months ago and forgot to post! Midi Land MD-401 v2.0, very similar to MusicQuest.

First post in this thread for me. https://i.imgur.com/FvmpZZT.jpg Hybrid 386/486 SiS461 Full-length Isa SBC by Macrotek Inc. Model written on board: Vertex M1 L2 Cache:256kb Cpu and Cache jumper settings written on the back, unfortunately the I/O jumper settings are missing and Macrotek does not …

I have assembled my simmconn kit this evening, it's a universal one. Tested with CT4500 and 8 MB FPM double sided, 16 MB EDO double sided and 32 MB EDO. Each one of theses modules worked and was fully detected and tested fine with Creative DIAGNOSE up to 28 MB with the 32 MB module. The only thing I …

Another necropost, I know 😢 , but for anyone in search of this bios, here it is. Hope it could be useful to someone else.

I know it's an old post, but just for reference ct-5agm2 uses ADP3152 voltage regulator, jp4 sets the 5 bits used by the VR to correctly output the desired voltage. ADP3152 can drive the 2 mosfets to output from 1.8V to 3.5V in 0.05 increments up to 2.1V and then 0.1V increments up to 3.5. Chaintech …