ALPHA REV G SCHEMATIC

All information relating to the Alpha plus all the WIP threads etc.
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exxos
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ALPHA REV G SCHEMATIC

Post by exxos » Thu Sep 27, 2018 5:11 pm

This is the original Alpha schematic with most of the current known fixes/changes..

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FIX HISTORY (SCHEMATIC)




The BGACK pull up fix wasn't actually needed, it was another side of a jumper pad, so wasn't showing up in the diagram when I looked before..
viewtopic.php?f=19&t=1185&start=10#p10086

Some resistors have been moved to RP5 (new resistor pack). New RP near 1772 for pull ups (3 seperate resistors moved)


FIX HISTORY (PCB)

(bare in mind nothing in this PCB is routed. Connectors moved may not be 100% but as close as I can tell )

  • PSU holes should now be correct
  • MIDI & Cartridge posts moved upwards, should now be correct
  • All back row ports (aside from serial) have been moved to the right and adjusted. They all should now align.
  • MIDI connectors now have "dual holes" to fit both styles.
  • Added floppy mounting holes.
I still have a LOT of holes to add , plus floppy posts etc.. this will be ongoing for some weeks most likely.

gpcb.jpg
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4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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Re: ALPHA REV G SCHEMATIC

Post by rubber_jonnie » Thu Sep 27, 2018 5:30 pm

Ahh, awesome, I was hoping this would all end up in one place, with a bit of luck I can get working on mine again soon.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
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Re: ALPHA REV G SCHEMATIC

Post by exxos » Mon Oct 01, 2018 7:08 pm

Added floppy holes... very hard to get it 100% as having to print out on paper to check which isn't ideal. Really could have done with a blank PCB... BEST has some, but didn't get anywhere like normal, only takes paypal :roll:

Saying that, I got some duff boards, I need to take some connectors off for the STF anyway.. So will probably heatgun the board to death and remove all parts from it so I got something flat I can measure against properly.

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4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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