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1088XLD - Custom A8 Computer in 1050 Drive Case

Alternative Atari Motherboard Piggybacks 1088XEL tech Repurposing a 1050 case

542 replies to this topic

#526 ivop OFFLINE  

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Posted Mon Apr 8, 2019 10:34 AM

Nice! This is exactly why the jumpers where there in MIDI Muse, to use an external keyboard to drive the internal WaveBlaster synth! :)



#527 mytek OFFLINE  

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Posted Tue Apr 9, 2019 12:17 PM

Nice! This is exactly why the jumpers where there in MIDI Muse, to use an external keyboard to drive the internal WaveBlaster synth! :)

 

Unfortunately this is not possible on the latest MIDI XEL II since that only has the ability to route the MIDI-OUT to the built-in synthesizer. However it probably wouldn't be all that difficult to write a simple program to loop the MIDI-IN data over to the output :ponder: .

 

-------------

 

Now for some mouse fun on the XLD...

 

 

Download: Attached File  PAD (NTSC).xex   30.93KB   10 downloads

Download: Attached File  PAD (PAL).xex   30.92KB   9 downloads



#528 ivop OFFLINE  

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Posted Tue Apr 9, 2019 12:32 PM

 

Unfortunately this is not possible on the latest MIDI XEL II since that only has the ability to route the MIDI-OUT to the built-in synthesizer. However it probably wouldn't be all that difficult to write a simple program to loop the MIDI-IN data over to the output :ponder: .

 

I think (judging by DrVenkman's video) that midirec can do it. It says right there on the screen, MIDI THRU off. Turning it on should relay all incoming events to MIDI OUT.

 

Edit: MIDI Muse also had this functionality so it can even be used without an Atari, as long as +5V power is supplied.


Edited by ivop, Tue Apr 9, 2019 12:36 PM.


#529 _The Doctor__ OFFLINE  

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Posted Tue Apr 9, 2019 1:44 PM

HUUH?

Sorry, you don't have permission for that! [#10171]

You do not have permission to view this attachment.

Need Help?

 

Unfortunately this is not possible on the latest MIDI XEL II since that only has the ability to route the MIDI-OUT to the built-in synthesizer. However it probably wouldn't be all that difficult to write a simple program to loop the MIDI-IN data over to the output :ponder: .

 

-------------

 

Now for some mouse fun on the XLD...

 

 

Download: PAD (NTSC Version)

Download: PAD (PAL Version)

Sorry, you don't have permission for that!

[#10171]

You do not have permission to view this attachment.


Need Help?

 

WTF moment, since when?


Edited by _The Doctor__, Tue Apr 9, 2019 1:47 PM.


#530 Brentarian ONLINE  

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Posted Tue Apr 9, 2019 2:19 PM

Dr. V nice work!!!  Looking forward to completing one of these boards, maybe two.  Between homes at the moment and everything is in boxes:(

Hi Firedawg,
I see that your location is Atlanta. Will you be attending VCFSE this year? I will have my 1088XLD on display.

#531 mytek OFFLINE  

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Posted Tue Apr 9, 2019 2:53 PM

 

I think (judging by DrVenkman's video) that midirec can do it. It says right there on the screen, MIDI THRU off. Turning it on should relay all incoming events to MIDI OUT.

 

Edit: MIDI Muse also had this functionality so it can even be used without an Atari, as long as +5V power is supplied.

 

I'll go check that out :) .

 

 

 

HUUH?

Sorry, you don't have permission for that! [#10171]

You do not have permission to view this attachment.

Need Help?

Sorry, you don't have permission for that!

[#10171]

You do not have permission to view this attachment.


Need Help?

 

WTF moment, since when?

 

 

Try it now, it should be fixed.



#532 _The Doctor__ OFFLINE  

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Posted Tue Apr 9, 2019 2:57 PM

It is indeed.



#533 rockdoc2010 ONLINE  

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Posted Fri Apr 12, 2019 12:35 AM

Killing ME!  I need a public release!

 

Thank all of you that are working so diligently to vet this board.

 

Douglas



#534 Stephen OFFLINE  

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Posted Fri Apr 12, 2019 7:54 AM

I'm really hoping to do a power up test on mine this weekend.  I don't have what I need to make the video cable, but I will pick the points from the PCB just to test this.



#535 DrVenkman OFFLINE  

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Posted Fri Apr 12, 2019 4:45 PM

I'm really hoping to do a power up test on mine this weekend.  I don't have what I need to make the video cable, but I will pick the points from the PCB just to test this.

 

Fingers crossed for you, Stephen! Looking forward to hearing your results. :)

 

I had intended to order my front panel this weekend but taxes are due, my car registration is also due (which frankly I had forgotten about!) and, well, I *may* have just bought an oscilloscope, lol. So front panel in two weeks. :P I need to buy paint for my case, clean it up thoroughly, etc. That will keep me busy for now. 



#536 DrVenkman OFFLINE  

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Posted Sat Apr 13, 2019 2:52 PM

Heh. The XLD's internal S2 player works simultaneously with outboard (external) MIDI players connected to the MIDI OUT jack. I actually started this experiment expecting that if it worked, I'd have had to connect to the MIDI Thru jack, thinking that enabling the S2 would sort of "re-direct" the OUT data to the internal synth. Nope, I was wrong.

 

This adds some fun possibilities. :)

 



#537 DrVenkman OFFLINE  

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Posted Wed Apr 17, 2019 7:34 PM

When I was building my board, I was basically finished a few days before I was able to succesfully boot the machine. Turned out I had installed one diode backward on the main PCB (diode D3, I'm lookin' at you, you little sumbitch! :P ) That one is designed to go in "backwards" or reversed compared to several others neaby in the clock circuit, and while the board silkscreen clearly shows the correct orientation, I simply overlooked it. But in the process of tracking down the issue, I decided I needed a "real" oscilloscope. I had been fooling around with a little $60 USB-based device (a Hantek 6022BE) connected to a Raspberry Pi as an interface and display, but it was awkward to set up, kind of a pain in the butt to use and limited in terms of sample rate, measurements, etc. 

 

Anyway, I convinced myself to spend some hobby money on a decent hobbyist scope and it arrived this week. For comparison sake, here's the OSC clock oscillator circuit that comes from the NTSC crystal in my machine as it goes into pin 28 on the GTIA, measured by my little Hantek USB scope. The Raspberry Pi it's connected to is running OpenHantek, an open-source replacement for the Windows-only Hantek software the device comes with:

 

2019-03-29-165436_1024x768_scrot.png

 

Now here's the same signal measured tonight with my new "real" scope:

 

SDS00007.png

 

While I was at it, I measured the Phi1 and Phi2 clock signals generated by the SALLY chip as well. If the OSC is the heartbeat of the Atari computer, the Phi2 is its brainwaves. 

 

SDS00020.png

 

SDS00021.png

 


Edited by DrVenkman, Wed Apr 17, 2019 7:36 PM.


#538 DrVenkman OFFLINE  

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Posted Tue May 7, 2019 2:09 PM

A few more weeks, my front-panel arrived and so another step closer to "done." 

 

IMG_1486.JPG

 

IMG_1487.JPG

 

 



#539 mytek OFFLINE  

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Posted Tue May 7, 2019 8:42 PM

Looks great :thumbsup: . Now you just need to rebrand it as "1088XLD" instead of the old 1050 label.

 

Speaking of which, I ended up using a Krylon Clear Matte finish over my new label to protect it from finger prints. First I laid down a couple of coats, and then after it dried, I pointed the nozzle up in the air, letting it drift down on top of the label, thus giving it a bit of texture. Came out very nice :) .



#540 AtariGeezer OFFLINE  

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Posted Wed May 15, 2019 3:51 PM

I'm really hoping to do a power up test on mine this weekend.  I don't have what I need to make the video cable, but I will pick the points from the PCB just to test this.

How's your progress coming along? inquiring minds like to know :)



#541 Stephen OFFLINE  

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Posted Wed May 15, 2019 4:45 PM

How's your progress coming along? inquiring minds like to know :)

:(

Nothing but problems at work leading to 60 hours a week and 8 hours per week of yardwork.  I haven't touched the board since assembly was finished.  I haven't ordered my panels.

 

Also dealing with a foot problem causing me great pain and difficulty walking.  Making an appointment with a specialist in the next few days to see what is going on with that.



#542 Kyle22 ONLINE  

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Posted Wed May 15, 2019 10:14 PM

@Stephen: I hope your foot gets better soon. If it's gout, try (holding your nose) and taking shots of vinegar. I am afflicted only rarely (years), but that takes it OUT in a day or 2.

:)



#543 mytek OFFLINE  

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Posted Today, 4:41 PM

VGA Output on 1088XLD

 

GBS-8200_intro.JPG

GS-8200_U1MB_Menu.JPG

GBS-8200_Cool_World.JPG

closeups.jpg

 

Boards (Carrier PCB and GBS-8200)

 

GBS-8200_top.JPG

GBS-8200_bot.JPG

 

Flashing Firmware for Atari Video Modes

(Using PICkit2, although an AVR Programmer Port is also Provided)

 

GBS-8200_PICkit2.JPG

AVRDUDESS_GBS _Control_flash.png

 

Installed

GBS-8200_installed_XLD(1).JPG

GBS-8200_installed_XLD(2).JPG

 

 

I'm still fine tuning the hardware design (not happy with bottom side extended female board connectors), but it's getting pretty close and currently produces an excellent picture on my Sony HS75P VGA Monitor. It will require a few tweaks in the Monitor's setup menu such as clock, phase, and position, but once done everything's locked in from that point forward. The ATMega861 chip gets flashed with the GBS-Control code provided HERE. And the only adjustment on the GBS-8200 board is to set the 3 RGB input trim pots to their fully counter-clockwise position which gives maximum gain required by the Sophia's 0.7V outputs (original trim pot settings were assuming an Arcade machine's 1V RGB outputs).

 

I'll be purchasing a short DB15 Male to Female extension cable and making a suitable hole over one of the SIO connectors to make one side of the cable into a panel mount connector, so as to get access to the VGA signals outside of the case.

 

Since a 50 Hz PAL signal does get converted to 60 Hz, this allows any VGA monitor to work for PAL or NTSC, but as always the better the quality monitor, the better will be your results. I tried three old Dell monitors, and although they all worked, my Sony looked sooooo much better, giving a bright and crisp, high contrast ratio display.

 

Being as how I'm running this board off of the 1088XLD's 12 VDC supply, I get some much needed use of that circuit and leave the 5 VDC side free for the computer.

 

Non-Interlaced Display

 

So here's the downside. Interlacing has been disabled, which in 95% of the applications, games, and demos, doesn't matter. However when programmer's have resorted to a forced interlace mode via clever coding, it will not render correctly, yielding a 'sparkly' look. So something like FlickerTerm will not work. However on the plus side, due to the excellent resolution of the VGA monitor 'The Last Word's' software 80 column mode looks superb :) .

 

Where to Buy GBS-8200 Arcade Board

 

The GBS-8200 Arcade RGB to VGA converter board can be purchased from eBay for around $17-20. There is also a new version that essentially bolts on a VGA to HDMI chip for around $40 which should still work with my carrier board, but I don't know how good the HDMI output looks.






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