Sporniket's log on hardware stuff

Blogs & guides and tales of woo by forum members.
User avatar
Cyprian
Posts: 387
Joined: Fri Dec 22, 2017 9:16 am
Location: Poland

Re: Sporniket's log on hardware stuff

Post by Cyprian »

@sporniket are you going to recreate 260ST motherboard?
Lynx I / Mega ST 1 / 7800 / Portfolio / Lynx II / Jaguar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
DDD HDD / AT Speed C16 / TF536 / SDrive / PAK68/3 / Lynx Multi Card / LDW Super 2000 / XCA12 / SkunkBoard / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
http://260ste.atari.org
User avatar
sporniket
Posts: 956
Joined: Sat Sep 26, 2020 9:12 pm
Location: France
Contact:

Re: Sporniket's log on hardware stuff

Post by sporniket »

@Cyprian that's the plan.

edit: the sheet mention it is 260 and 520 ST.

edit 2 : just to be clear, I plan to have complete schematics and pcb, but I don't plan to build.
User avatar
sporniket
Posts: 956
Joined: Sat Sep 26, 2020 9:12 pm
Location: France
Contact:

Re: Sporniket's log on hardware stuff

Post by sporniket »

Placing and routing done. Some route are provisionnals as the vias are in fact the legs of the shifter...

The github repository is up to date.

Next session will happen around end of july/begining of august, as I am trying again to manage several projects simultaneously.

Capture d’écran du 2022-07-24 08-09-09-32c.png
Capture d’écran du 2022-07-24 08-09-09-32c.png (136.01 KiB) Viewed 1429 times
Capture d’écran du 2022-07-24 08-12-54.jpg
Capture d’écran du 2022-07-24 08-12-54.jpg (116.42 KiB) Viewed 1429 times
User avatar
sporniket
Posts: 956
Joined: Sat Sep 26, 2020 9:12 pm
Location: France
Contact:

Re: Sporniket's log on hardware stuff

Post by sporniket »

The shifter, composite with or without modulator, and the video port... I almost overlooked that the modulator get red/green/blue directly from the transistors directly, and not after the resistors like the video port.

subsheet_102-U31-Shifter ; J6-Video port.png
subsheet_102-U31-Shifter ; J6-Video port.png (375.2 KiB) Viewed 1383 times
User avatar
sporniket
Posts: 956
Joined: Sat Sep 26, 2020 9:12 pm
Location: France
Contact:

Re: Sporniket's log on hardware stuff

Post by sporniket »

Going on a little bit. The previous sheet was not complete, with missing numbering and one description missing.

I also reworked the layout in order to visually link Q3~Q5 to their regulated power rail instead of using a label.

subsheet_102-U31-Shifter ; J6-Video port.png
subsheet_102-U31-Shifter ; J6-Video port.png (375.47 KiB) Viewed 1246 times

Now working on this part of the PCB...

edit: github is up to date
User avatar
rubber_jonnie
Site Admin
Site Admin
Posts: 10467
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: Sporniket's log on hardware stuff

Post by rubber_jonnie »

nice work @sporniket, your STE schematics were a lifesaver when I was fixing @BrettRogersUK machine, I'm confident that these will be just as awesome :)
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...
User avatar
sporniket
Posts: 956
Joined: Sat Sep 26, 2020 9:12 pm
Location: France
Contact:

Re: Sporniket's log on hardware stuff

Post by sporniket »

rubber_jonnie wrote: Thu Sep 08, 2022 9:06 am nice work @sporniket, your STE schematics were a lifesaver when I was fixing @BrettRogersUK machine, I'm confident that these will be just as awesome :)
Thanks, and I hope so too. At the very least, the schematics will not be mixed with the 1040ST : in the scanned document I found (a field/service manual) there was a bunch of half pages mixed together that looked like left part then right parts, but in fact when printing each page, I then played a game of "which side goes with which ?). And no more deciphering of handwritten notes. The epitome of satisfaction would be that the PCB reconstitution "just works", but it's very unlikely that I order one and do the build.
User avatar
rubber_jonnie
Site Admin
Site Admin
Posts: 10467
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: Sporniket's log on hardware stuff

Post by rubber_jonnie »

sporniket wrote: Thu Sep 08, 2022 9:36 am
rubber_jonnie wrote: Thu Sep 08, 2022 9:06 am nice work @sporniket, your STE schematics were a lifesaver when I was fixing @BrettRogersUK machine, I'm confident that these will be just as awesome :)
Thanks, and I hope so too. At the very least, the schematics will not be mixed with the 1040ST : in the scanned document I found (a field/service manual) there was a bunch of half pages mixed together that looked like left part then right parts, but in fact when printing each page, I then played a game of "which side goes with which ?). And no more deciphering of handwritten notes. The epitome of satisfaction would be that the PCB reconstitution "just works", but it's very unlikely that I order one and do the build.
Yes, I can completely understand that, I've had a few machines (Dragon 32, 600XL, others too) which have all had multi part or left/right side schematics, it's a bloody nightmare tying stuff together.

I usually end up printing the pieces out and joining them together, but the Dragon was particularly frustrating, as there were 3 parts, 2 differing schematics and a separate one for the PSU!

Also, they were jpegs and not the best quality.
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...
User avatar
sporniket
Posts: 956
Joined: Sat Sep 26, 2020 9:12 pm
Location: France
Contact:

Re: Sporniket's log on hardware stuff

Post by sporniket »

After adjusting the PCB size and the positions of the holes (see viewtopic.php?f=23&t=5773 ), I finished to place the components around the shifter.

I had a hard time to find :
  • the location of R127 as the pictures of motheboards I use as help are contradictory I used the scanned pcb from the service manual to decide
  • the location of the group around Q10, that appears nowhere on the pictures. Again, I found some traces that are matching beside the video port.
atari-520ST-wip.jpg
atari-520ST-wip.jpg (84.42 KiB) Viewed 1107 times

Now it's time to do some routing
User avatar
sporniket
Posts: 956
Joined: Sat Sep 26, 2020 9:12 pm
Location: France
Contact:

Re: Sporniket's log on hardware stuff

Post by sporniket »

Enough routing for today. Next month I will do the EPROMS.

Capture d’écran du 2022-09-23 20-35-38.png
Capture d’écran du 2022-09-23 20-35-38.png (174.32 KiB) Viewed 1074 times

Some eye candies...

Capture d’écran du 2022-09-23 20-37-44.jpg
Capture d’écran du 2022-09-23 20-37-44.jpg (208.12 KiB) Viewed 1074 times
Capture d’écran du 2022-09-23 20-39-35.jpg
Capture d’écran du 2022-09-23 20-39-35.jpg (92.57 KiB) Viewed 1074 times

As usual, the github repository is up to date.
Post Reply

Return to “MEMBER BLOGS”