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

Rs232 Hdx

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#1 Tator OFFLINE  

Tator

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Posted Mon Jan 7, 2013 1:12 PM

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

Attached Files



#2 retroclouds OFFLINE  

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Posted Wed Jan 9, 2013 8:13 AM

Hi Sebastian, quick question; Have you tried to contact Fred Kaal via email ?
He's not on this forum, but he can be contacted via email.

#3 Willsy OFFLINE  

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Posted Wed Jan 9, 2013 8:59 AM

I have an HDX card that was built by Fred. I can take a look at what he did.

#4 Tator OFFLINE  

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Posted Wed Jan 9, 2013 11:22 AM

Thank you for your answers, I don´t have Fred Kaal email, does anybody knows in which email I can contact him?

Thank you

Sebastian

#5 retroclouds OFFLINE  

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Posted Wed Jan 9, 2013 11:52 AM

PM sent.

#6 arcadeshopper OFFLINE  

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Posted Tue Jan 22, 2013 5:06 PM

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...32-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, Mon Feb 11, 2013 4:38 PM.


#7 CantStopClicking OFFLINE  

CantStopClicking

    Moonsweeper

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Posted Mon Jan 28, 2013 1:23 AM

PM sent.


Could you share the photos of your board? This is one of my next projects. I'd love to see another working example.

Thanks in advance!

#8 Tator OFFLINE  

Tator

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Posted Mon Jan 28, 2013 5:39 AM

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

Attached Files



#9 Stuart OFFLINE  

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Posted Mon Jan 28, 2013 3:35 PM

A Maxim DS1210 (http://datasheets.ma...n/ds/DS1210.pdf) would make a good replacement for all those diodes, transistors and resistors in providing backup power for the RAM. It's a pretty foolproof little 8-pin chip that I've used with no problems in the past. ;-)

#10 CantStopClicking OFFLINE  

CantStopClicking

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Posted Thu Jan 31, 2013 3:06 AM

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.

#11 arcadeshopper OFFLINE  

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Posted Mon Feb 11, 2013 4:11 PM

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

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.



#12 CantStopClicking OFFLINE  

CantStopClicking

    Moonsweeper

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Posted Mon Feb 11, 2013 5:08 PM

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

#13 arcadeshopper OFFLINE  

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Posted Thu Feb 28, 2013 4:27 PM

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

-Dano


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

#14 CantStopClicking OFFLINE  

CantStopClicking

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Posted Thu Feb 28, 2013 4:29 PM

Dano is super happy! :D

#15 arcadeshopper OFFLINE  

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Posted Mon Mar 11, 2013 10:52 AM

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, Mon Mar 11, 2013 10:53 AM.


#16 arcadeshopper OFFLINE  

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Posted Thu Mar 21, 2013 10:59 AM

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.


Pre-order is now closed.. will be ordering the boards tomorrow 3/22 eta is 3-4 weeks

Greg





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