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Anyone had experience expanding its ppc portable pc with ISA slots, adding a vga card? I tried a trident 9000i2 set at 8bit mode, setting thr correct dipswitches on ppc, plus an ALE circuit (the one with flipflop at these forums, thanks) to be able to work with any 5160 xt but I'm not having...

hi everybody, i was wondering if anyone knows about (or any online doc) how cards in PC XT that uses dma normally behave, since dma requests for memory refresh are periodic. should the card shorten transfers or so, or have a means of pooling the DMA line for refresh, sync, etc to avoid...