BBC Model B No2. Will it live again!

Any 8bit repairs, images, cool things, upgrades etc.
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rubber_jonnie
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Re: BBC Model B No2. Will it live again!

Post by rubber_jonnie »

Ok, so over lunchtime I replaced the capacitors and crystal in the clock circuit.

During the process I took the time to buzz out all of the connections to the 74S04 in and around that area and it all seems fine, with everything connected to where it should connect.

Interestingly, I tested the 10nF cap at C40as my new multimeter has that function, and it read zero. I replaced both caps and the crystal and I now see a square wave at the point where C37 is connected to the crystal, and this I didn't have before.

Still no BooBip, but it does seem different. I should have another Beeb arriving tomorrow, which should allow me to at least see what things should look like at different points.
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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stephen_usher
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Re: BBC Model B No2. Will it live again!

Post by stephen_usher »

Well, at least there is progress. Is the sound any different and do you get a clock signal now?
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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rubber_jonnie
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Re: BBC Model B No2. Will it live again!

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stephen_usher wrote: 26 May 2021 15:24 Well, at least there is progress. Is the sound any different and do you get a clock signal now?
Seemingly yes, I need to go and plug it in and see if there is a video signal as I seem to be getting something now where I didn't before.

Unfortunately feeling quite unwell at the moment so it'll have to happen later.
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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PhilC
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Re: BBC Model B No2. Will it live again!

Post by PhilC »

Some good progress, hope you feel better soon RJ.

P.s. had my second jab on Sunday as well, better than the first but still feeling the fuzziness.
If it ain't broke, test it to Destruction.
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Re: BBC Model B No2. Will it live again!

Post by stephen_usher »

rubber_jonnie wrote: 26 May 2021 16:18
stephen_usher wrote: 26 May 2021 15:24 Well, at least there is progress. Is the sound any different and do you get a clock signal now?
Seemingly yes, I need to go and plug it in and see if there is a video signal as I seem to be getting something now where I didn't before.

Unfortunately feeling quite unwell at the moment so it'll have to happen later.
OK. You take care of yourself.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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rubber_jonnie
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Re: BBC Model B No2. Will it live again!

Post by rubber_jonnie »

@stephen_usher @PhilC

Thanks gents, feeling a little better now.

Stupid jabs, but they have to be done.
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: BBC Model B No2. Will it live again!

Post by JezC »

Glad you're feeling a bit better. My wife had her second jab last Saturday...mine is still 3 weeks off!
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rubber_jonnie
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Re: BBC Model B No2. Will it live again!

Post by rubber_jonnie »

JezC wrote: 26 May 2021 20:24 Glad you're feeling a bit better. My wife had her second jab last Saturday...mine is still 3 weeks off!
Thanks, hope yours goes smoothly.
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: BBC Model B No2. Will it live again!

Post by JezC »

rubber_jonnie wrote: 26 May 2021 20:28 Thanks, hope yours goes smoothly.
Me too - just found out that my cousin has now gone 14 weeks since his first jab & still hasn't been given a date for his next jab... :(
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rubber_jonnie
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Re: BBC Model B No2. Will it live again!

Post by rubber_jonnie »

JezC wrote: 26 May 2021 23:08
rubber_jonnie wrote: 26 May 2021 20:28 Thanks, hope yours goes smoothly.
Me too - just found out that my cousin has now gone 14 weeks since his first jab & still hasn't been given a date for his next jab... :(
Oh, that's odd I got both my dates when I booked the first one.
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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