Sinclair ZX80 / ZX81 / Z88 Forums

Need a working 40077 IC for Sinclair +2A

Thanks,
chapas

Welcome to the ZX80 / ZX81 Forums Your best bet to track down the issue is to use the online +3 service manual (there is no real difference between the +2A and +3) - see http://www.worldofspectrum.org/ZXSpectrum128+3ServiceManual There is a self test available if you press down the BREAK key whilst...

Hello, i have one Sinclair 128K +2A/B (Black Case / Issue 1) witch is not booting and thought i should ask for some help. I have took 3 different pictures from the same problem after powering up the unit, seen bellow. I have already made some test to help the diagnose, also have multimeter and oscil...