im looking for some free z80 or 6502 processors

7

777xxx

Member

• Oct 30, 2021

• #1

i have a few computers that i want to repair (2 x zx spectrums, an atari 800 and an atari 2600) and im sure its the cpus that are faulty. i have run diagnostic tests on all these systems and swapped out all the chips except the cpus. i just dont have any more of these in stock. any help would be appreciated.

 

P

Pommie

Well-Known Member

Most Helpful Member

• Oct 30, 2021

• #2

Have you considered that most items fail in a particular way so the chips you swapped (unless swapped for new ones) could still be the faulty ones.

Mike.

 

7

777xxx

Member

• Oct 31, 2021

• #3

no, i have tested them in other machines and they work

 

S

shokjok

Member

• Feb 16, 2022

• #4

Is any activity seen by probing the CPU pins?

 

C

cj7hawk

New Member

• Jul 17, 2022

• #5

This is a slow thread... ZX Spectrums rarely lose the z80. Most commonly they lose the -5v and 12v rails, and then the 4116 RAMs stop working and die... The most common repair on a Spectrum is fix the rails, then replace the faulty 4116 chips.