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Ti99Hdx project: Installing a Hdx Board in a RS232 Card help


Tator

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Hi,

I built an HdX PCB to modify an RS232, Fred Kaal design, (http://members.ziggo.nl/fredgkaal/index.html)

and now I´m ready to mount it in the original RS232 but have some doubts regarding the installations of the switchs and would like to check if somebody already did it and can help me.

 

1) According to the schematic view (http://members.ziggo.nl/fredgkaal/Pics/ti99hdx/ti99_rs232_dsr_ram.gif) the trace that has to be cutted is the one that goes from pin 8 of the 74LS21 (u17) to pin 1 of the 74LS125 (u6), but in the picture of the modifier RS232 card (http://members.ziggo.nl/fredgkaal/Hardware/hw_ti99hdx_card_rs232.html) the trace that is cutted is pin #3 of the 74LS125 (u6).

 

2) Switch 1 (SW1) is added to be able to close the previous cutted trace and also pin #1 of the 74LS125 (u6) is connected with a 10K Resistance (R6) to +5V, is that correct? Any suggestion on where to take those +5V? Could pin12/13 of the 74LS21 (u17) be used?

 

I´ll appreciate your help!

 

Kind regards

 

Sebastian Magnasco

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  • 2 weeks later...

I just built one as well. Had zero problems getting it running.

 

https://sphotos-b.xx...411104870_n.jpg

is my board with the hacky wiring :)

 

You can see i just cut the lead of the chip where the interrupt is off the board and bent it up and attached a wire to it and the the other side of the switch is just wired to the test point on that same trace down near the peb connector (because I'm lazy and soldered it to the easier spot :)

 

The other three wires were soldered to chips and the other test point per his instructions at http://members.ziggo.nl/fredgkaal/Pics/ti99hdx/ti99-rs232-complete.gif And the resistor removed at R19..

 

Greg

 

 

Hi,

I built an HdX PCB to modify an RS232, Fred Kaal design, (http://members.ziggo...kaal/index.html)

and now I´m ready to mount it in the original RS232 but have some doubts regarding the installations of the switchs and would like to check if somebody already did it and can help me.

 

1) According to the schematic view (http://members.ziggo...232_dsr_ram.gif) the trace that has to be cutted is the one that goes from pin 8 of the 74LS21 (u17) to pin 1 of the 74LS125 (u6), but in the picture of the modifier RS232 card (http://members.ziggo...card_rs232.html) the trace that is cutted is pin #3 of the 74LS125 (u6).

 

2) Switch 1 (SW1) is added to be able to close the previous cutted trace and also pin #1 of the 74LS125 (u6) is connected with a 10K Resistance (R6) to +5V, is that correct? Any suggestion on where to take those +5V? Could pin12/13 of the 74LS21 (u17) be used?

 

I´ll appreciate your help!

 

Kind regards

 

Sebastian Magnasco

Edited by arcadeshopper
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Of course, I´m attaching the pics, aswell as some tips based on my learnings building the project that may help you.

 

- Please note that Fred updated the schematics to include with or without switch option.

 

- I did a PCB, but if you are not familiar with doing this or can´t get one done I would recommend to

use a standard perforated project board. Drilling the holes at the precise location for the IC socket and the connector is not very easy. .

 

- I kept half of the original metallic clamshell and just added a couple of nuts and washers to the original nuts to still have it as a heat disipator. ( see pics)

 

- I couldn´t find small switches that can fit nicely in the card so I decided for a jumper-type solution using a pair of onboard male plug connectors. ( see pics).

 

Hope this helps.

 

Any doubt, just let me know.

 

Best

 

Sebastian

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Tator: Sweet! Thanks for posting the pic's and sharing your comments.

 

Stuart: That's a cool little package there (DS1210). I could see that getting implemented in a SuperCART. :grin: I just wish I knew enough to engineer something with it!

 

Is there any interest in a group buy on a PCB order for the HDX project? And probably more important, is there any cost benefit in a group buy?

 

If so, I'd be happy to get the ball rolling.

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  • 2 weeks later...

Note, Fred released a DSR and HDX pc side update today. http://members.ziggo.nl/fredgkaal/Software/sw_ti99hdx.html#ti99hdx the new server is not compatible with the old DSR so you should update the DSR first.

 

I am already ordering a small run of boards if they are good quality-wise/work right I plan on a pre-order group buy for more.

 

Greg

 

Tator: Sweet! Thanks for posting the pic's and sharing your comments.

 

Stuart: That's a cool little package there (DS1210). I could see that getting implemented in a SuperCART. :grin: I just wish I knew enough to engineer something with it!

 

Is there any interest in a group buy on a PCB order for the HDX project? And probably more important, is there any cost benefit in a group buy?

 

If so, I'd be happy to get the ball rolling.

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Note, Fred released a DSR and HDX pc side update today. http://members.ziggo...dx.html#ti99hdx the new server is not compatible with the old DSR so you should update the DSR first.

 

I am already ordering a small run of boards if they are good quality-wise/work right I plan on a pre-order group buy for more.

 

Greg

 

Definitely count me in! As "they" say.... +1

 

-Dano

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  • 3 weeks later...
  • 2 weeks later...

I got in my small run of boards and just built one last night, works great. Anyone else interested lmk and I'll add you to the count for the next order. Dano's already on it :)

 

Greg

 

http://www.arcadesho...id=21147033 is the pre-order for the next run of boards. There's a google wallet checkout link in the cart for cards.

Edited by arcadeshopper
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  • 2 weeks later...

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