added the chipset's datasheet just in case more knowledgeable people see something relevant in there 😀

with Tiido's input we poked the chipset on system about it's version and apparently it has a different product code meaning a -FC1 datasheet is needed (which ofcourse is nowhere to be found as expected 🤣). This is what the system reports , it seems the changes are enough to mess with TLB

Maybe you can tinker with UMBDRVR ( http://www.win3x.org/win3board/viewtopic.php? … =30&f=8&t=26070 )
I'm not sure if I'm getting the documentation properly, but I think you can use more than the listed chipsets by doing something)

^ thanks will give it a shot but tbh I am not that hopeful 😁

keropi wrote on 2019-08-11, 11:27:

^ thanks will give it a shot but tbh I am not that hopeful 😁

Hi sorry to revive this old thread, finally did you find any way to do UMBs on this IBM? thanks!

theelf wrote on 2022-11-14, 04:04:

Hi sorry to revive this old thread, finally did you find any way to do UMBs on this IBM? thanks!

Nope, no luck

keropi wrote on 2022-11-14, 05:43:

theelf wrote on 2022-11-14, 04:04:

Hi sorry to revive this old thread, finally did you find any way to do UMBs on this IBM? thanks!

Nope, no luck

Thanks, yes me neither. i give up to umb on this ibm on real mode

lucky us there is new drivers like shuxcd that are soo low on mem compared to old times

keropi wrote on 2022-11-14, 05:43:

theelf wrote on 2022-11-14, 04:04:

Hi sorry to revive this old thread, finally did you find any way to do UMBs on this IBM? thanks!

Nope, no luck

Hi, sorry, here again

I found a nice way to have UMBs, exactly 32kb

i have some old hercules clone cards, and using this driver i attach and this command now i have plenty of memory

DEVICE=UMB.SYS /I=b000-b800

Need to load after himem

theelf wrote on 2022-11-15, 15:36:

i have some old hercules clone cards, and using this driver i attach and this command now i have plenty of memory

... at a terrible speed ...

mkarcher wrote on 2022-11-15, 16:58:

theelf wrote on 2022-11-15, 15:36:

i have some old hercules clone cards, and using this driver i attach and this command now i have plenty of memory

... at a terrible speed ...

I did not notice any diference at all exept.the extra 32kb

Everything works exactly same, any test to do?

theelf wrote on 2022-11-15, 17:08:

mkarcher wrote on 2022-11-15, 16:58:

theelf wrote on 2022-11-15, 15:36:

i have some old hercules clone cards, and using this driver i attach and this command now i have plenty of memory

... at a terrible speed ...

I did not notice any diference at all exept.the extra 32kb

Everything works exactly same, any test to do?

The system will just stay as fast as it was before, except if you use the hercules clone memory, which is likely 1/10th of the speed of the onboard memory, and most likely uncached. If you only load stuff that is uncritical for performance into the UMB at B000-B800, you are likely fine. I wouldn't load smartdrive, a CD-ROM driver or network drivers into that UMB. You will be fine with mouse and keyboard drivers, because execution of these drivers only is a very small part of what your computer is doing.

mkarcher wrote on 2022-11-16, 15:23:

theelf wrote on 2022-11-15, 17:08:

mkarcher wrote on 2022-11-15, 16:58:

... at a terrible speed ...

I did not notice any diference at all exept.the extra 32kb

Everything works exactly same, any test to do?

The system will just stay as fast as it was before, except if you use the hercules clone memory, which is likely 1/10th of the speed of the onboard memory, and most likely uncached. If you only load stuff that is uncritical for performance into the UMB at B000-B800, you are likely fine. I wouldn't load smartdrive, a CD-ROM driver or network drivers into that UMB. You will be fine with mouse and keyboard drivers, because execution of these drivers only is a very small part of what your computer is doing.

I understand this. I did some test, load the cdrom driver in hercules umb and no performance difference at all, reading, loading, etc. I tested too the scsi driver (aspi, etc) and benchmark the external HDD and no difference too

maybe will be a problem in faster machines? like pentium?