Scratch one LS244 and replace it with another, so that I've got 2 matching chips and it passes the ram tests just fine but crashes later on
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PhilC's H4 Mongrel edition build x 3
Re: PhilC's H4 Mongrel edition build x 3
So the good news is that I found the ram problem.
Scratch one LS244 and replace it with another, so that I've got 2 matching chips and it passes the ram tests just fine but crashes later on
Scratch one LS244 and replace it with another, so that I've got 2 matching chips and it passes the ram tests just fine but crashes later on
If it ain't broke, test it to Destruction.
Re: PhilC's H4 Mongrel edition build x 3
Much better @PhilC, must be getting close. 
Re: PhilC's H4 Mongrel edition build x 3
I think you're right @PaulJ . Hope to get it up and running this week all being well.
If it ain't broke, test it to Destruction.
Re: PhilC's H4 Mongrel edition build x 3
And one MMU pin being held down with flux instead of solder fixed and now I have a booting SMT H4 as well 
If it ain't broke, test it to Destruction.
Re: PhilC's H4 Mongrel edition build x 3
PhilC wrote: Tue Jan 21, 2020 6:48 pm And one MMU pin being held down with flux instead of solder fixed and now I have a booting SMT H4 as well![]()
Re: PhilC's H4 Mongrel edition build x 3
Whew, I was afraid @rubber_jonnie was going to best ya there for a while. Congrats, Phil!! nice job.PhilC wrote: Tue Jan 21, 2020 6:48 pm And one MMU pin being held down with flux instead of solder fixed and now I have a booting SMT H4 as well![]()
Re: PhilC's H4 Mongrel edition build x 3
You never know @PaulJ , I might get my third one completed before @rubber_jonnie as well?
If it ain't broke, test it to Destruction.
Re: PhilC's H4 Mongrel edition build x 3
Hmm, I'm betting @rubber_jonnie will finish the H4 up. I wonder if @exxos is going to spin a H4.1 will all fixes incorporated.?PhilC wrote: Tue Jan 21, 2020 7:22 pm You never know @PaulJ , I might get my third one completed before @rubber_jonnie as well?
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Re: PhilC's H4 Mongrel edition build x 3
To be fair, mine is finished, it's just not fully functioning yetPhilC wrote: Tue Jan 21, 2020 7:22 pm You never know @PaulJ , I might get my third one completed before @rubber_jonnie as well?
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
