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Looks like I'll be getting a Mega ST4 soon

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exxos
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Re: Looks like I'll be getting a Mega ST4 soon

Post by exxos »

PaulJ wrote: 12 Dec 2019 14:44 Never hurts to have some extra pull-ups available in various locations on the H4. :D
:lolbig: :merryxmas:
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PaulJ
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Re: Looks like I'll be getting a Mega ST4 soon

Post by PaulJ »

exxos wrote: 12 Dec 2019 15:23
PaulJ wrote: 12 Dec 2019 14:44 Never hurts to have some extra pull-ups available in various locations on the H4. :D
:lolbig: :merryxmas:
I really didn't put it out there as a challenge. :stars:
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Re: Looks like I'll be getting a Mega ST4 soon

Post by rubber_jonnie »

PaulJ wrote: 12 Dec 2019 14:44 Don't cut it off RJ, bend it up and if you ever need another pullup you can wire wrap to the pin that's bent up along the body. Never hurts to have some extra pull-ups available in various locations on the H4. :D
Good idea!

:dizzy:
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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
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Re: Looks like I'll be getting a Mega ST4 soon

Post by rubber_jonnie »

PaulJ wrote: 12 Dec 2019 15:52
exxos wrote: 12 Dec 2019 15:23

:lolbig: :merryxmas:
I really didn't put it out there as a challenge. :stars:
Oooh, I like a challenge!
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...
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Re: Looks like I'll be getting a Mega ST4 soon

Post by rubber_jonnie »

I decided that today was the day for pulling out the resistor packs from the Mega 4 in preparation for the arrival of the 9 pin 2.2ks. Interestingly I found this resistor pack was cracked in the middle.
IMG_20191214_143829.jpg
I know I didn't break it during removal but it could be a clue as to why things have been erratic if only three of the resistors were actually doing anything.

I'll post again once I have the ones installed.

The other thing is that some of the vias are already in a terrible state even before I get started. Nothing that a bodge wire can't fix though.
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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...
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Re: Looks like I'll be getting a Mega ST4 soon

Post by PhilC »

Funny what you can find when fixing old Megas, well done finding that SIL, woulda been a pain to find otherwise.
If it ain't broke, test it to Destruction.
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Re: Looks like I'll be getting a Mega ST4 soon

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Wow a cracked sil wouldn't help things that's for sure.
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Re: Looks like I'll be getting a Mega ST4 soon

Post by rubber_jonnie »

It potentially answers the questions of why it would sometimes just die when I next powered it off and on. I'd manhandle the board, then it would work again. Possibly the cracked SIL making and breaking a connection. Finally when I manhandled the board a lot during the CPU removal, I reckon it finally finished the SIL off.

We'll see what happens when I fit the new ones.

@exxos it had a mix of 4.7k and 10k, I take it 2.2k all round is fine?
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...
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Re: Looks like I'll be getting a Mega ST4 soon

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@rubber_jonnie yeah I use 2.2k all around.
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Re: Looks like I'll be getting a Mega ST4 soon

Post by rubber_jonnie »

@exxos Cool thanks.
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...
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