DoG's Hx Mongrel build attempt

Topic for users to share their building progress.
DoG
Posts: 176
Joined: Sat Apr 07, 2018 12:26 pm

DoG's Hx Mongrel build attempt

Post by DoG » Sat Oct 12, 2019 12:12 pm

Got myself a donor Atari STfm. A C070859 Rev 2.1. Tested it and it worked fine, so I know that the components are not faulty. Lucky for me it was super clean inside...
Filthy Atari.jpg
Filthy Atari.jpg (87.51 KiB) Viewed 1171 times
Keyboard right side.jpg
Keyboard right side.jpg (89.45 KiB) Viewed 1171 times
Keyboard left side.jpg
Keyboard left side.jpg (78 KiB) Viewed 1171 times


Apparently someone has fixed it at some point.
Service.jpg
Service.jpg (99.56 KiB) Viewed 1171 times




Planning on changing the rubber domes for some stiffer ones. ""TT touch" feeling. We will se about that.
Keyboard dirty.jpg
Keyboard dirty.jpg (116 KiB) Viewed 1171 times
Keyboard and parts clean.jpg
Keyboard and parts clean.jpg (123.9 KiB) Viewed 1171 times


Let's start desoldering then...
Board with stuff.jpg
Board with stuff.jpg (163.71 KiB) Viewed 1171 times
Board with less stuff.jpg
Board with less stuff.jpg (173.82 KiB) Viewed 1171 times
Components.jpg
Components.jpg (110.14 KiB) Viewed 1171 times
I removed the three oscillators as well as the PSU attachment pins.


Washed the shell with soapy water.
Cleaned shell.jpg
Cleaned shell.jpg (130.08 KiB) Viewed 1171 times

I haven't ordered any components yet. But I do have a 4Mb 72pin RAM module, some sockets and a 25 pin female and male connector already.

User avatar
PhilC
Moderator
Moderator
Posts: 2369
Joined: Fri Mar 23, 2018 8:22 pm

Re: DoG's Hx Mongrel build attemt

Post by PhilC » Sat Oct 12, 2019 12:35 pm

Good work so far :dualthumbup:
If it ain't broke, test it to Destruction.

DoG
Posts: 176
Joined: Sat Apr 07, 2018 12:26 pm

Re: DoG's Hx Mongrel build attemt

Post by DoG » Tue Nov 05, 2019 4:32 pm

Ordered all the stuff I was missing yesterday. Seems the postman/woman is coming with it tomorrow. Lucky I already got a few DS1315 and the crystal for it, coz that sucker is expensive. At least from digikey. Well, I guess not that expensive.

User avatar
exxos
Site Admin
Site Admin
Posts: 9319
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: DoG's Hx Mongrel build attemt

Post by exxos » Tue Nov 05, 2019 4:40 pm

I have found a cheaper source of DS1315 (not china crap either!) , not massive cheaper, but I would have to buy 100 of them :(
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.

stephen_usher
Posts: 425
Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
Contact:

Re: DoG's Hx Mongrel build attemt

Post by stephen_usher » Tue Nov 05, 2019 4:56 pm

The TT keyboard isn't stiffer, it's FAR lighter touch, more similar to current keyboards. Not surprising as it's made by Mitsumi who made/make cheap PC keyboards for a living.
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.

DoG
Posts: 176
Joined: Sat Apr 07, 2018 12:26 pm

Re: DoG's Hx Mongrel build attemt

Post by DoG » Tue Nov 26, 2019 5:54 pm

stephen_usher wrote:
Tue Nov 05, 2019 4:56 pm
The TT keyboard isn't stiffer, it's FAR lighter touch, more similar to current keyboards. Not surprising as it's made by Mitsumi who made/make cheap PC keyboards for a living.
Ok, so wrong word to explain it. More "tactile" then. Either way, I have fitted those pink rubber domes and screwed it together now. Started to fit 'RETURN' and 'SPACE' bar because those are the most fiddly to deal with. But seems that I have lost 'E' and 'X' during the cleaning process. Unbelievable!! How did that happened? Well, got some "new" keys on the way.

DoG keyboard.png
DoG keyboard.png (360.8 KiB) Viewed 532 times


The package with mongrel board arrived today but I don't think I have time to solder that much before Christmas. Great project during the holidays.

BTW, I feel rude but were we suppose to get an opto coupler in the package? I didn't get mine if that was the case. Never mind, I just ordered some of those elsewhere. Got the DAC in small plastic jar. Neat package.

User avatar
exxos
Site Admin
Site Admin
Posts: 9319
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: DoG's Hx Mongrel build attempt

Post by exxos » Tue Nov 26, 2019 6:10 pm

I never sent any optos out, only the DAC's. With so many boxes of junk everywhere I just never found them.
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.

DoG
Posts: 176
Joined: Sat Apr 07, 2018 12:26 pm

Re: DoG's Hx Mongrel build attempt

Post by DoG » Tue Nov 26, 2019 6:36 pm

exxos wrote:
Tue Nov 26, 2019 6:10 pm
I never sent any optos out, only the DAC's. With so many boxes of junk everywhere I just never found them.
Aah. No worries!

derkom
Posts: 245
Joined: Sun Jul 29, 2018 6:45 pm

Re: DoG's Hx Mongrel build attemt

Post by derkom » Tue Nov 26, 2019 6:38 pm

DoG wrote:
Tue Nov 26, 2019 5:54 pm
Got the DAC in small plastic jar. Neat package.
It took me a moment to figure it out, but when I saw the underside I realised it's a contact lens box. Good choice, @exxos ! :geek:

User avatar
exxos
Site Admin
Site Admin
Posts: 9319
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: DoG's Hx Mongrel build attemt

Post by exxos » Tue Nov 26, 2019 6:44 pm

derkom wrote:
Tue Nov 26, 2019 6:38 pm
It took me a moment to figure it out, but when I saw the underside I realised it's a contact lens box. Good choice, @exxos ! :geek:
I think they were "make up" tubs.. but yeah, solid enough to ship the chips in, couldn't really think of any other simple way of doing it :)
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.

Post Reply

Return to “MONGREL H4 USER BUILDS”