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.
BBC Model B No2. Will it live again!
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rubber_jonnie
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- Posts: 14902
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- Location: Essex
Re: BBC Model B No2. Will it live again!
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...
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stephen_usher
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- Location: Oxford, UK.
Re: BBC Model B No2. Will it live again!
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.
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
- Site Admin

- Posts: 14902
- Joined: 17 Aug 2017 19:40
- Location: Essex
Re: BBC Model B No2. Will it live again!
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.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?
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...
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!
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.
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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stephen_usher
- Site sponsor

- Posts: 7380
- Joined: 13 Nov 2017 19:19
- Location: Oxford, UK.
Re: BBC Model B No2. Will it live again!
OK. You take care of yourself.rubber_jonnie wrote: 26 May 2021 16:18Seemingly 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.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?
Unfortunately feeling quite unwell at the moment so it'll have to happen later.
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.
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.
-
rubber_jonnie
- Site Admin

- Posts: 14902
- Joined: 17 Aug 2017 19:40
- Location: Essex
Re: BBC Model B No2. Will it live again!
@stephen_usher @PhilC
Thanks gents, feeling a little better now.
Stupid jabs, but they have to be done.
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...
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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JezC
- Posts: 2783
- Joined: 28 Aug 2017 23:44
Re: BBC Model B No2. Will it live again!
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
- Site Admin

- Posts: 14902
- Joined: 17 Aug 2017 19:40
- Location: Essex
Re: BBC Model B No2. Will it live again!
Thanks, hope yours goes smoothly.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!
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...
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JezC
- Posts: 2783
- Joined: 28 Aug 2017 23:44
Re: BBC Model B No2. Will it live again!
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
- Site Admin

- Posts: 14902
- Joined: 17 Aug 2017 19:40
- Location: Essex
Re: BBC Model B No2. Will it live again!
Oh, that's odd I got both my dates when I booked the first one.JezC wrote: 26 May 2021 23:08Me 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... :(
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...
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