Theres 4 caps around the DMA already.. no need to add a 5th.. :)Realloy wrote: 17 Sep 2018 20:33 i can see all the chips have a decoupling capacitor,,, but what about BAD DMA ? is there one and where? or is it not necessary?
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ALPHA MODIFICATIONS
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exxos
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Re: ALPHA MODIFICATIONS
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PhilC
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Re: ALPHA MODIFICATIONS
For the sync fix I pulled both pins 8 and 9 out of the U51 socket and then jumpered the socket.
If it ain't broke, test it to Destruction.
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kodak80
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Re: ALPHA MODIFICATIONS
Do you have a photos of the change for us less technical builders? And did this resolve the sync problem?Forgottenmyname wrote: 18 Sep 2018 10:45 For the sync fix I pulled both pins 8 and 9 out of the U51 socket and then jumpered the socket.
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PhilC
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Re: ALPHA MODIFICATIONS
Hopefully you can see it on here.
It didn't sort my sync problem but will work on that.
It didn't sort my sync problem but will work on that.
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If it ain't broke, test it to Destruction.
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exxos
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Re: ALPHA MODIFICATIONS
You shouldn't pull pin 9 because you will have 2 floating gates in the chip then due to disconnected inputs.Forgottenmyname wrote: 18 Sep 2018 10:45 For the sync fix I pulled both pins 8 and 9 out of the U51 socket and then jumpered the socket.
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PhilC
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Re: ALPHA MODIFICATIONS
Ok will put 9 back in, good point
If it ain't broke, test it to Destruction.
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exxos
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Re: ALPHA MODIFICATIONS
BR PULL UP FIX
Bodge wire 1... Wire the thick yellow drawn wire as shown on the back of the pcb...
(Fixing missing pull up resistor on BR).
Bodge wire 1... Wire the thick yellow drawn wire as shown on the back of the pcb...
(Fixing missing pull up resistor on BR).
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exxos
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Re: ALPHA MODIFICATIONS
BGACK PULL UP FIX
Bodge resistor 1..... 2.2K between the 2 circled points on back of CPU socket...
(fixes missing pull up on BGACK)
Bodge resistor 1..... 2.2K between the 2 circled points on back of CPU socket...
(fixes missing pull up on BGACK)
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troed
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Re: ALPHA MODIFICATIONS
I'm confused by this being connected to BR.exxos wrote: 18 Sep 2018 18:23 Bodge resistor 1..... 2.2K between the 2 circled points on back of CPU socket...
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exxos
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Re: ALPHA MODIFICATIONS
Its a missing pull up resistor on BR & BGACK.
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