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Thanks all the guys here for providing the ALE mod fix. I can confirm trident 9000i-2 is working now on my Amstrad PPC640. I extended its bus, with databus pullups to an ISA socket and this card. I just had this 8-16 bit card .. so it was a relief. great effort monitoring the isa control signals.

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...

strange, those are basic functions, so it will take always some memory for the code, stack, etc... also if one ground the reset pin of dma controller, one may have to reprogram again the controller for that channel (as the rom do at startup) anyway my question was about how cards on xt may use...

what i was asking actually is how block mode should be handled by cards that uses, block mode in a PC XT. yes, fdc uses single transfer mode. hence asking if (a possibility) pooling lines and sync etc, so theres a correct release of the dma to allow the next dma refresh. i have just 2 books...

but what if dma already started and the controller is in the middle of a long block transfer, say to an aligned block of 64K ? the XT memory refresh ocorrs at every 72 clocks (15.12us) (clock=CLK88) between those 72 clocks, then one should transfer a much lesser amount of bytes within this...

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...