I have the ieee-488 tester from tynemouth software at power up all led are on except 'REN' and 'D3' replacing the 6520 by a bulgarian 6821 [CM602] has the same effect, apparently the problem comes from a mc3446 I dont remember the use of the 'REN' line... btw with a bulagarian 6502 [CM630P] the commodore works .... then memory seems stable (not yet fully tested..., I guess I'll have to wait the mc3446) On 06/10/2016 23:25, Ethan Dicks wrote: > On Thu, Oct 6, 2016 at 4:08 PM, didier derny <firstname.lastname@example.org> wrote: >> I tried the following thing: >> >> removed -5v >> removed +12v and send 5v on +12v >> removed 4116 >> installed sockets >> installed 4164 >> >> works!!! > Superb! > >> just need to restore +9v unregulated (apparently only used or tape motor) > Right (I do happen to use my tape drive - I was reading tapes last night) > >> IEEE-488 still not working (pia cold, look strange) > I have substituted a 6821 for the 6520 PIA and it seems to work fine. > The 6821 is not hard to find (especially at my house since I worked > for a place that had a product that included a 6821 and I got all the > old stock when they closed). > >> everything is reversible... (no definitive modifications) > Even better. > > Cheers, > > -ethan > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2016-10-07 20:00:02
Archive generated by hypermail 2.2.0.