Need help witha green screen 500+ Board..

[britlord]

Guy, I bought this early 500+ board (No custom chips though) that had only 512k Ram and no clock, and these jumper pads had been Bridged with solder, so I removed all the solder from those pads (jp2, JP3, JP7A, JP9 , and the 2 at U32.. I fitted the other four ram chips, so have 1MB of ram now and the chip at U32 is fitted too.. But all I get is a flashing green screen. All the custom chips come from a working 500 board and the ram too... Should I jumper some of those pads.. Oh the 1/2 watt R408 resister burned out when powered up..

Please take a look, you'll see all the pads that are Bridged with solder... I forgot. There is a cap soldered to the undersized of the board at the Angus socket.. The Angus is a 360544-01 none VBB..

 

[VosCoBoss]

Need help witha green screen 500+ Board..

Capacitor is correct for vbb variants of agnus. However the cap would not be the reason for a green screen in any case.

Did you check out a guide like this one to do the upgrade? https://www.tsb.space/bl0g/upgrade-amiga-500-rev-8a-board-to-amiga-500/

 

[levo-ace]

R408 is by the mouse ports and provides the power restriction to it . It was an amiga mouse plugged in and not a pc serial mouse??

 

[britlord]

Capacitor is correct for vbb variants of agnus. However the cap would not be the reason for a green screen in any case.

Did you check out a guide like this one to do the upgrade? https://www.tsb.space/bl0g/upgrade-amiga-500-rev-8a-board-to-amiga-500/

I've done all that but Green screen.. You see all the custom chips (Except for the Angus) and ram chips came out of my working 500 v6 board, so I know they are working/ Maybe a bad Angus chip (It does get warm though)...

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R408 is by the mouse ports and provides the power restriction to it . It was an amiga mouse plugged in and not a pc serial mouse??

Oh R408 was already blown when I received the board..

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Oh I see that on the web the site that board JP2 has 3 pads and pad 2 and 3 are Bridged, so I'll Bridged them and see what happens..