DoG's Hx Mongrel build attempt

DoG · Post by **DoG** » 12 Oct 2019 12:12

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

Keyboard right side.jpg

Keyboard left side.jpg

Apparently someone has fixed it at some point.

Service.jpg

Planning on changing the rubber domes for some stiffer ones. ""TT touch" feeling. We will se about that.

Keyboard dirty.jpg

Keyboard and parts clean.jpg

Let's start desoldering then...

Board with stuff.jpg

Board with less stuff.jpg

Components.jpg

I removed the three oscillators as well as the PSU attachment pins.

Washed the shell with soapy water.

Cleaned shell.jpg

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.

Post by **PhilC** » 12 Oct 2019 12:35

Good work so far :dualthumbup:

DoG · Post by **DoG** » 05 Nov 2019 16:32

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.

Post by **exxos** » 05 Nov 2019 16:40

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

stephen_usher · Post by **stephen_usher** » 05 Nov 2019 16:56

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.

DoG · Post by **DoG** » 26 Nov 2019 17:54

stephen_usher wrote: 05 Nov 2019 16:56 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

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.

Post by **exxos** » 26 Nov 2019 18:10

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

DoG · Post by **DoG** » 26 Nov 2019 18:36

exxos wrote: 26 Nov 2019 18:10 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!

Post by **derkom** » 26 Nov 2019 18:38

DoG wrote: 26 Nov 2019 17:54 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:

Post by **exxos** » 26 Nov 2019 18:44

derkom wrote: 26 Nov 2019 18:38 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 :)

exxos's Atari, Amiga & retro forum

DoG's Hx Mongrel build attempt

DoG's Hx Mongrel build attempt

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