Switch Setting for an IBM 512KB Memory Board

[Old PC Man]

Does anyone have documentation on the 16 dip switches for an IBM 512KB memory board?

The current settings allocate all 512KB to Extended memory. I want to allocate 128KB to Base Memory and the remaining 384KB to Extended Memory. This arrangement will increase my AT 5170 Base Memory to 640KB (the motherboard has 512KB).

Thanks,

Old PC Man

 

[Super-Slasher]

I don't even know if what you say is possible - allocating some memory to the base and some to the extended range, but then again, I am still newbee at this, pretty much, hehe.

If it is possible, then you're just going to do what I had to do for my extended memory board, just try settings one by one, a painstakingly long process. It took me about 2 hours to get the 8-switch DIP on my card to the somewhat proper settings (got the memory to register but the ports still don't work). I think you're just going to have to settle with 512KB of extended memory.

Luckily, I also have the 128KB base memory card in my AT, giving me the full 640KB base memory, then 2MB of extended.