forum speccy.pl
Komputery z Z80 => TIMEX => Wątek zaczęty przez: o0Nosferatu0o w 2022.05.25, 02:26:24
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Hi, i made some boards for Pear's Ti-of-TTL v1 card and i'm looking for the BOM list for it. I realy need tho know the Capacitors,Diode and Resitances to use. All the rest i already have.
If someone know, please share with me.
Best regards,
Pedro Torres
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Hmm ... maybe ask the designer about it. He is present on this forum.
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Schematic with BOM in attachment.
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Thank you Pear, i can assemble the boards now.
Best regards,
Pedro Torres
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Hi Pear, can you tell me about these 2 in the back of the card?
Also i'm going to use the 27c256 with Ti-of-ttl Rom , which jumpers positions i have to put?
Best regards,
Pedro Torres
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Pear, can you please tell me what are those corrections on the back of the card? There's a wire , a resistor and a Tantalum cap??? Can you tell me the values?
Best regards,
Pedro Torres
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No answer from Pear, tested the card and i'ts NOT Working.
Boots with Red Border and white lines with squares on Paper.
Made the mods on the back of the card with 1k resistor , cut trace and add wire. Also added a 47nf Tantalum. Front of the card has a small wire instead of the 1k Resistor. No joy
Someone please help , if possible.
Best regards,
Pedro Torres
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So it seems to me that you have a very old version of the pcb, which was a test version.
As far as I know, and I know the creator of this project well, only a few people had this version of pcb. Later versions were already free of the bugs that your pcb has.
Recently it has been a known practice that people search for production interface files, order a specific batch, and then sell them on Ebay or SellMyRetro.
These people hope to make a quick profit, but offer no help to those who buy such tiles from them. You may have been scammed in this way by a dishonest seller.
Could you please write how and where you came into possession of this pcb version?
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Hi, the card schematic was taken from the forum and Pear itself sent me the BOM for it. Any help for making it work is appreciated. I'm not going to sell any of these, it's for my own use as i've 3 FDD3000 in need of interfaces.
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I know, but did you get the pcb from Pear as well ?
If so, according to the schematic attached above, with the corrections made, everything should work.
I have all versions of the Ti-of-TTL that Pear developed and everything works for me.
Of course I also had the pcb from the project author. Besides, there are no tantalum capacitors there, just ordinary 100nF or 47nF.
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No, i got the gerbers from the forum. If you can get me to the right direction, i would appreciaate it.
I'm using a 27c256 eprom with ti-of-ttl rom, can you tell me the jumper's for it?
Do i have to put the 1k resistor on top of the board or the bottom?
Best regards,
Pedro Torres
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I contacted the author of the project and in the conversation he did not mention anything about sharing gerber files ?
If you can, please post pictures of this Ti-of-TTL version you have here. I have the Issue 3 and Issue 4 version as shown in the pictures.
I'm afraid your pcb has a lot of bugs and it will be very difficult or impossible to get it working without the help of the project author.
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Hi, as i said the gerbers where taken from the Forum itself . Post nº11 from this link : https://www.speccy.pl/forum/index.php?topic=627.0
The gerbers are in the attachment. This is my own fault, i've asked Pear for the ti-of-ttl and it seems a very occupied person and i didn't want to take much time from him. So i found those gerbers and made new cards. Later on he sent me the Diptrace schematic for it but the card doesn't work. I have all the parts, i would like to put it to work with Timex 2048/2068, ZX Spectrum 128/+2 Grey only with the FDD3000. So any help is apreciated.
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If Pear doesn't mind sharing the gerbers for a working version or Someone selling a blank card to me, i would be very appreciated too.
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Hi, as i said the gerbers where taken from the Forum itself . Post nº11 from this link : https://www.speccy.pl/forum/index.php?topic=627.0
This is just a prototype version with some bugs.
One of the errors is e.g. wrong paths.
https://www.speccy.pl/forum/index.php?topic=627.msg26442#msg26442
As far as I know, the tiles of the finished version are long over, and the author did not plan to resume this project
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@o0Nosferatu0: you have schematic, PCB design and PCBs. So, you could trace all connections on the PCB with multimeter and check them against the schematic. Anyway, my markups (in green) on PCB desing rev 1 attached. I hope they would help.
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Hi, thank you very much. I will give it a try tonight when i get home from work and report back.
Thanks so much
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Hi, the jumpers are needed or not?
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In my mind, yes, they are. Please have a look at photos there:
https://www.speccy.pl/forum/index.php?topic=627.msg26442#msg26442
and at YouTube there:
https://www.youtube.com/watch?v=dTpAIdYlcWM
BTW Pear explained the purpose of these jumpers in the post there: https://www.speccy.pl/forum/index.php?topic=627.msg25653#msg25653
Pamięć EPROM może mieć pojemność od 4 KB (2732) do 32 KB (27256). Wybór typu pamięci zworkami.
EPROM memory can be in range from 4 KB (2732) to 32 KB (27256). The memory type can be selected with jumpers.
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Hi, after a long time i tested the card and finally it's working. I can now use my ZX Spectrum and Timex's again with FDD3000.
Is there a way to put various Rom's in 1 eeprom and add a switch to change which one to use - ie 2048 / 2068 / Stavi / Test Rom?
If anyone could help, much appreciated.
Best regards and thank you for your help.
Pedro Torres