Marks suggestion is also good, but I also had no success with a 3.5" drive that works on an Amstrad PCW 8512. The PCW expects a ready signal, so the drive got modified. Hmmm, strange.
Trouble with two interfaces
Re: Trouble with two interfaces
Thanks everybody for your suggestions. Doesn´t sound very promising for the early version of the interface then. Mine says "Q1", just below the top transistor.
Still I will try with a new WD1770 first, once it arrives.
Marks suggestion is also good, but I also had no success with a 3.5" drive that works on an Amstrad PCW 8512. The PCW expects a ready signal, so the drive got modified. Hmmm, strange.
Marks suggestion is also good, but I also had no success with a 3.5" drive that works on an Amstrad PCW 8512. The PCW expects a ready signal, so the drive got modified. Hmmm, strange.
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chriskgnr
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Re: Trouble with two interfaces
Q1 is the pcb(and schematics) letter code for this transostor. Q1 is like the R2 and R3 codes for the two resistors near the xtal(crystal oscillator). 
Re: Trouble with two interfaces
Ah, did not realize that.Thanks!
Could not spot any other hint on what version the board is.
Could not spot any other hint on what version the board is.
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Re: Trouble with two interfaces
Success with the Expanderam! I ordered a bunch of memory chips from China and replaced first half of the chips on the board. Either it was the wrong half or more than one chip was broken, but when I replaced the second half in addition, the white screen was gone and the PEEK_L command for installed RAM showed 640KB 
With sixteen new RAM chips: To the next 30 years!
With sixteen new RAM chips: To the next 30 years!
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1024MAK
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Re: Trouble with two interfaces
Excellent news, well done
Mark
Mark
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QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)