So, a very quick bit of lunchtime diagnosis on the 600XL and I have found that there is no address line activity at all on the RAM chips at all. No RAS or CAS activity either.
I see some on the ROMs and Sally, and though I do need to check the rest of the ICs, I need to take a closer look at the logic sitting in front of the RAM.
So that's a bunch of LS logic chips, and those I can test with my TLS866
It's 600XL time!
- rubber_jonnie
- Site Admin
- Posts: 10616
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: It's 600XL time!
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...
- rubber_jonnie
- Site Admin
- Posts: 10616
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: It's 600XL time!
And one is dead according to the TLS866, a 74LS51, quite a key component, and the one of the few 74LS logic chips I don't actually have to hand!!
Hopefully they will arrive soon!
Hopefully they will arrive soon!
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...
- rubber_jonnie
- Site Admin
- Posts: 10616
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: It's 600XL time!
EDIT - The remaining 74LS logic chips all test good, and given that the failed 74LS51, U16, is slap bang in the middle of the CAS/RAS circuit:rubber_jonnie wrote: ↑Fri Jan 14, 2022 2:03 pm And one is dead according to the TLS866, a 74LS51, quite a key component, and the one of the few 74LS logic chips I don't actually have to hand!!
Hopefully they will arrive soon!
Then I think I definitely need to change it.
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...
Re: It's 600XL time!
Don't fully trust TL866 in terms of TTL testing, especially those less common. There are mistakes in the test vectors, verify them first.
- rubber_jonnie
- Site Admin
- Posts: 10616
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: It's 600XL time!
Fair comment, I will have a look.
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...
- rubber_jonnie
- Site Admin
- Posts: 10616
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: It's 600XL time!
Well the replacement 74LS51 arrived but made no difference.
Better do some proper diagnosis then
Better do some proper diagnosis then
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...
- stephen_usher
- Posts: 5664
- Joined: Mon Nov 13, 2017 7:19 pm
- Location: Oxford, UK.
- Contact:
Re: It's 600XL time!
More oscilloscope fun!
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: 10616
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: It's 600XL time!
Indeed!! My scope has never seen so much action!
I'll also use my TL866 Pro to check the new ICs, but it might be the case that @tzok is correct and the 74LS51 has a bad logic table in the software, so doesn't test right, and I haven't got round to checking the vectors yet.
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...
- rubber_jonnie
- Site Admin
- Posts: 10616
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: It's 600XL time!
Ok, so checking the new 74LS51s reveals that it looks like the TL866 test vectors are bad, but I have dropped a new IC in anyway.
I'm seeing activity on the address lines, but some just don't look right, and I do see CAS/RAS activity on the RAM during power up, so that's something.
I am concerned that Sally may have expired as she is extremely hot quite soon after power up, and what with the weird address line activity too, it's definitely a concern.
Clocks are all good at Sally too and elsewhere on the board.
I suspect that the GTIA and ANTIC are probably ok as I do get a picture, albeit a wrong one. More digging needed and the 800XL is going to have to be opened up, see if I can borrow any socketed parts for testing, though I have a horrible feeling Sally is socketed in the 800XL. We'll see.
I'm seeing activity on the address lines, but some just don't look right, and I do see CAS/RAS activity on the RAM during power up, so that's something.
I am concerned that Sally may have expired as she is extremely hot quite soon after power up, and what with the weird address line activity too, it's definitely a concern.
Clocks are all good at Sally too and elsewhere on the board.
I suspect that the GTIA and ANTIC are probably ok as I do get a picture, albeit a wrong one. More digging needed and the 800XL is going to have to be opened up, see if I can borrow any socketed parts for testing, though I have a horrible feeling Sally is socketed in the 800XL. We'll see.
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...
- stephen_usher
- Posts: 5664
- Joined: Mon Nov 13, 2017 7:19 pm
- Location: Oxford, UK.
- Contact:
Re: It's 600XL time!
Poor Sally.
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.