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Re: Trouble with two interfaces
Posted: Tue Mar 17, 2015 11:44 am
by schombi
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.
Re: Trouble with two interfaces
Posted: Tue Mar 17, 2015 1:13 pm
by chriskgnr
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
Posted: Tue Mar 17, 2015 2:01 pm
by schombi
Ah, did not realize that.Thanks!
Could not spot any other hint on what version the board is.
Re: Trouble with two interfaces
Posted: Sat Mar 21, 2015 5:02 pm
by schombi
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!
Re: Trouble with two interfaces
Posted: Sat Mar 21, 2015 5:45 pm
by 1024MAK
Excellent news, well done
Mark
Re: Trouble with two interfaces
Posted: Sat Mar 21, 2015 7:30 pm
by chriskgnr
well done!