You have things so easyrubber_jonnie wrote: ↑Wed Aug 05, 2020 11:43 pm I've checked the datasheets and everything seems the same:
Mac Classic - will it ever run again!!
Re: Mac Classic - will it ever run again!!
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
- rubber_jonnie
- Site Admin
- Posts: 10641
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Mac Classic - will it ever run again!!
Nice to have something go my way on this one!!exxos wrote: ↑Wed Aug 05, 2020 11:58 pmYou have things so easyrubber_jonnie wrote: ↑Wed Aug 05, 2020 11:43 pm I've checked the datasheets and everything seems the same:
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: 10641
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Mac Classic - will it ever run again!!
Tried reading the original ROM, but it is a no go, so I think it is dead, as the 27C400s I have, being the same pinout, read just fine.
So so far looking like a dead CPU and dead ROM since all the voltages measure correct at the power plug in the mobo.
On a positive note, a guy over at the 68kMLA forum has offered to send me some boards for spares that were killed by the affectionately named 'Maxell Bomb'.
It's called this when the PRAM battery literally explodes over the mobo and corrodes things beyond the point of no return.
Given my board seems to be ok from a corrosion PoV, it will at least give me other chips to work with if I need them once the CPU is replaced. Just waiting for a CPU socket now as well, we'll see what occurs after that.
So so far looking like a dead CPU and dead ROM since all the voltages measure correct at the power plug in the mobo.
On a positive note, a guy over at the 68kMLA forum has offered to send me some boards for spares that were killed by the affectionately named 'Maxell Bomb'.
It's called this when the PRAM battery literally explodes over the mobo and corrodes things beyond the point of no return.
Given my board seems to be ok from a corrosion PoV, it will at least give me other chips to work with if I need them once the CPU is replaced. Just waiting for a CPU socket now as well, we'll see what occurs after that.
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: Mac Classic - will it ever run again!!
@rubber_jonnie
That's good to hear about some spare parts and I have seen those battery pop got to love lithium batterys of any type. Those are in the mega ste as well
Tom
That's good to hear about some spare parts and I have seen those battery pop got to love lithium batterys of any type. Those are in the mega ste as well
Tom
- rubber_jonnie
- Site Admin
- Posts: 10641
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Mac Classic - will it ever run again!!
Yeah, the parts are good news indeed.
I have removed the battery from my Mega STE, as I have a CosmosEx it sets the time at boot, so there's no requirement for a clock battery
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: 10641
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Mac Classic - will it ever run again!!
As promised, I've posted a list of the analog board capacitors I swapped in my other thread, but for consistency it's here too:
The list of analog board capacitors for my particular Mac Classic as follows:
2200uF 16v
1000uF 16v
1000uF 10v
47uF 25v x2
2200uF 10v x2
470uF 50v
RIFA PME 290 MB or equivalent. I believe the value is 10nF, but check your values.
In addition I replaced 7x 47uF 16v and 1x 1uF 16v capacitors on the logic board with tantalums.
Again, check your own board first for values and quantities.
I've also managed today to get the socket installed:
And I went with the suggestion from @Tomswork to remove the plastic square from the middle of the socket to get access to the centre of the socket to allow easy access after the hot air solder so I could clean up.
Obviously I will need to drop the plastic square into the bottom of the newly installed socket to ensure the chip sits in the correct spot.
As it happened there were only 3 solder bridges and all cleaned up fine with solder wick. Continuity is all fine and I have checked for shorts too, and all is fine there too.
I have a spare ROMs now, so I can test as much as I like, but need to make sure the ROM is correctly placed in the socket to avoid killing another.
Next I need to power up ROM and CPU less to make sure all seems well in terms of power at the pins.
The list of analog board capacitors for my particular Mac Classic as follows:
2200uF 16v
1000uF 16v
1000uF 10v
47uF 25v x2
2200uF 10v x2
470uF 50v
RIFA PME 290 MB or equivalent. I believe the value is 10nF, but check your values.
In addition I replaced 7x 47uF 16v and 1x 1uF 16v capacitors on the logic board with tantalums.
Again, check your own board first for values and quantities.
I've also managed today to get the socket installed:
And I went with the suggestion from @Tomswork to remove the plastic square from the middle of the socket to get access to the centre of the socket to allow easy access after the hot air solder so I could clean up.
Obviously I will need to drop the plastic square into the bottom of the newly installed socket to ensure the chip sits in the correct spot.
As it happened there were only 3 solder bridges and all cleaned up fine with solder wick. Continuity is all fine and I have checked for shorts too, and all is fine there too.
I have a spare ROMs now, so I can test as much as I like, but need to make sure the ROM is correctly placed in the socket to avoid killing another.
Next I need to power up ROM and CPU less to make sure all seems well in terms of power at the pins.
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: Mac Classic - will it ever run again!!
Looks good i was digging thru my macintosh box down in storage and found a mac classic board it has some issues. Nice work on the socket
@rubber_jonnie
Tom
@rubber_jonnie
Tom
Re: Mac Classic - will it ever run again!!
@rubber_jonnie
Can you see why this classic board does not work
Tom
Can you see why this classic board does not work
Tom
- stephen_usher
- Posts: 5680
- Joined: Mon Nov 13, 2017 7:19 pm
- Location: Oxford, UK.
- Contact:
Re: Mac Classic - will it ever run again!!
Ooops!
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: 10641
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Mac Classic - will it ever run again!!
Yup, that'll never fly right!
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...