kodak80 H4 build (x2)

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exxos
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Re: kodak80 H4 build (x2)

Post by exxos »

Do you have a scope that you can start checking signals out with as Derkim has been doing and as in my fix it guide ?
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Re: kodak80 H4 build (x2)

Post by kodak80 »

Yes, I have a 2 channel scope which I can use so will look to work through your guide over the next few nights.
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Re: kodak80 H4 build (x2)

Post by kodak80 »

@exxos Any reason FC2 has a pull up on both RP5 and RP8? Pin 9 on both SILs.
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Re: kodak80 H4 build (x2)

Post by kodak80 »

@exxos sorry, another question.

We have been working through you testing guide and AS and DTACK are both going high as expected but my board is still only showing white screen and no floppy access. All pull-ups are fine, and cpu puns check out as per testing guide so need some further pointers.

The BGACK PULL-UP FIX is my question as JP16 is already connecting R150 4.7k resistor as a pull-up. Adding a 2.2k resistor with JP16 jumpered is in parallel. JP 16 would need to be removed for the 2.2k fix to work correctly.
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Re: kodak80 H4 build (x2)

Post by Icky »

Good spot @kodak80. So thats a 1K1 pull-up on FC2 :)
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Re: kodak80 H4 build (x2)

Post by derkom »

Icky wrote: Sun Dec 08, 2019 9:28 am Good spot @kodak80. So thats a 1K1 pull-up on FC2 :)
Agh, no wonder. That one weird pull-up has bugged me every time I've been checking those! :D
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Re: kodak80 H4 build (x2)

Post by kodak80 »

My address being read from ROM is

0000000000001110

Which is wrong so just checking the soldering on the TOS ROM pins.
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Re: kodak80 H4 build (x2)

Post by kodak80 »

Icky wrote: Sun Dec 08, 2019 9:28 am Good spot @kodak80. So thats a 1K1 pull-up on FC2 :)
I just bent up one of the SIL pins to remove the double-up.
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Re: kodak80 H4 build (x2)

Post by exxos »

kodak80 wrote: Sun Dec 08, 2019 8:51 am @exxos Any reason FC2 has a pull up on both RP5 and RP8? Pin 9 on both SILs.
oops :)
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: kodak80 H4 build (x2)

Post by exxos »

kodak80 wrote: Sun Dec 08, 2019 9:27 am The BGACK PULL-UP FIX is my question as JP16 is already connecting R150 4.7k resistor as a pull-up. Adding a 2.2k resistor with JP16 jumpered is in parallel. JP 16 would need to be removed for the 2.2k fix to work correctly.
Its the same on the original..

Yes there are 2 resistors in parallel, but when the jumper is removed, you then need 2 resistors to pull up each side of the now broken signal. Its probably how I missed the resistor off in the first place as I assumed it was connected anyway.

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https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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