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stephen_usher
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Re: General Stuff(tm)

Post by stephen_usher »

Looks like I'll be adopting another machine soon... A Mega2 ST inc. UK keyboard.
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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PhilC
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Re: General Stuff(tm)

Post by PhilC »

stephen_usher wrote: Tue Nov 21, 2023 2:27 pm Looks like I'll be adopting another machine soon... A Mega2 ST inc. UK keyboard.
Nice, I must get round to fixing the temperamental floppy drive on mine.
If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: General Stuff(tm)

Post by rubber_jonnie »

stephen_usher wrote: Tue Nov 21, 2023 2:27 pm Looks like I'll be adopting another machine soon... A Mega2 ST inc. UK keyboard.
Oooh, nice :)
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: General Stuff(tm)

Post by stephen_usher »

OK... Fixed the cable but... the pin-out I have is still very wrong. After buzzing out the Sony VGA adapter it looks like the pinout I have has pins 4 and 5 swapped... i.e. it has SENSE0 on pin 4 and GRN.VID on pin 5 but the Sony adapter has the opposite. *sigh*

I think I'm going to have to cut some tracks and add some bodge wires. At least I can do this with the new PCB.
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: General Stuff(tm)

Post by rubber_jonnie »

stephen_usher wrote: Tue Nov 21, 2023 8:20 pm OK... Fixed the cable but... the pin-out I have is still very wrong. After buzzing out the Sony VGA adapter it looks like the pinout I have has pins 4 and 5 swapped... i.e. it has SENSE0 on pin 4 and GRN.VID on pin 5 but the Sony adapter has the opposite. *sigh*

I think I'm going to have to cut some tracks and add some bodge wires. At least I can do this with the new PCB.
How vey annoying :pullhair:
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: General Stuff(tm)

Post by stephen_usher »

OK, after rewiring those two traces I've got h-sync and v-sync out of the LHM1980, so that's a positive sign. However, I couldn't get the h-sync to go to the VGA connector properly, It's being pulled down by something, so I started probing around the header pins and trying to match them to the pinout I have for the Mac II video port...

Oh dear! It's not just the SENSE0 & GREEN-VID which are swapped. Oh no, there's video on the SENSE1 pin too. The whole bloomin' lot are wrong, and it's not my cable as I've checked that. *sigh*
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: General Stuff(tm)

Post by rubber_jonnie »

stephen_usher wrote: Wed Nov 22, 2023 8:57 pm OK, after rewiring those two traces I've got h-sync and v-sync out of the LHM1980, so that's a positive sign. However, I couldn't get the h-sync to go to the VGA connector properly, It's being pulled down by something, so I started probing around the header pins and trying to match them to the pinout I have for the Mac II video port...

Oh dear! It's not just the SENSE0 & GREEN-VID which are swapped. Oh no, there's video on the SENSE1 pin too. The whole bloomin' lot are wrong, and it's not my cable as I've checked that. *sigh*
Sounds like you have a right jumble on your hands!!!

Good luck.
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: General Stuff(tm)

Post by stephen_usher »

I think that I'll have to buzz out the connections on the Sony Mac->VGA adapter, I can then get the correct pin assignments. Once I have that I can create another cable with the correct wiring and make up another board without my bodges and cut traces. That's if I bother continuing at all.
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.
User avatar
rubber_jonnie
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Joined: Thu Aug 17, 2017 7:40 pm
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Re: General Stuff(tm)

Post by rubber_jonnie »

stephen_usher wrote: Wed Nov 22, 2023 9:10 pm I think that I'll have to buzz out the connections on the Sony Mac->VGA adapter, I can then get the correct pin assignments. Once I have that I can create another cable with the correct wiring and make up another board without my bodges and cut traces. That's if I bother continuing at all.
Not sure if it's the same/similar connector, but I bought a VGA adapter for my Performa that is 15pin to VGA but with dip switches. Unfortunately it's sealed, so I can't tell exactly what the switches do (It's currently set for my Performa) unless I can find the dip-switch layout. I'll see if I can find it if it'll help.
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
Posts: 5796
Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
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Re: General Stuff(tm)

Post by stephen_usher »

It's more the other wiring, such as the video and sync signals I need.

The DIP switch just changes the connections to the SENSE0->2 pins to tell the Mac what display is connected. For the 640x480 colour display pins 4 and 10 are grounded.
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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