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cbelcher

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About cbelcher

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  1. Yep - did this mod a week ago with the Longhorn Engineer mod - I think it may actually be nearly identical... But at least you can follow wires for the labels to the points on the board. Start here: https://longhornengineer.com/deprecated-static-pages/diy/atarivideomods/2600-searsva2-ntsc/ And the all important missing picture from that page is here: They are pickup points for the TIA pins as well as 5V and GND. You can try following wire colors from the other photos but safest to confirm with a multimeter on continuity mode between the resistors / diodes and the TIA chip pin numbers - which you seem to know.
  2. Mq. Would it be possible for you to convert the 1Mb files for the VQFP package as well? I can find a 1Mb SDX image to put on your cart. Thank you
  3. Thank you - I saw some data at the end of the 1024kB file and wondered if I needed it. Working well now - thanks!
  4. So, how is a 4mbit .bin image to burn to the eprom made? I know they said 1/2 of an 8mbit Atarimax bin image, but dropping off the last 512kB in a hex editor doesn't work for me...
  5. Fierodoug5, I like the cases - and yes my next project was going to be Talk is Cheap as well. We both used the same schematic I presume, but the 800xl it's hooked up to can be a little wonky anyway, so that may be the source of glitching. Crc_Error, for a bare board - $5 plus postage. I need to find the cheapest way to send a small bare board - probably bubble mailer. You can PM me. Another option for sound output, as noted in the article is to feed the audio back to the SIO port - I labeled it on the silkscreen. But yep, I've had the cheesy speaker from the article for a long time too.
  6. So FujiNet is awesome with built in SAM, but I have had a project on the back burner for the last 30 years or so. To build the CheepTalk by Lee Brilliant, that I saw in ANALOG back in the day. I think it attracted me because computer speech is fun, but as it turns out, Dr. Brilliant lived in the same city I did, and we are both MD's... Never met him though. I've had the SPO256 from Radio Shack the entire time, and decided to finally put it to use. The original article: Analog Computing 29, April 1985 vol 4 page 59 With follow up articles and others using the same hardware: Analog Computing 32, July 1985 vol 7 page 7 (Correction) Analog Computing 34, September 1985 vol 9 page 94 (Correction) Analog Computing 56, July 1987 vol 7 page 54 (Talker by Anthony Nogas) Antic, January1987 vol 5 n 9 p13 (Talking Typewriter by Bill Marquardt) Atari Classics, April 1993 vol2 n 2 page 19 (Cheep Talk Type 'n' Talk by Louis Marcotte) So I rounded up the software I could find and have attached them. I built a PCB in KiCAD from Dr. Brilliant's schematic and made the ports the same width as my 800xl (Gerbers attached). Overall it has been fun - the board seems a little glitchy and needs to be reset at times, but does put out speech to an amplified speaker. If you build it - do NOT buy cheap knockoff SPO256-AL2 chips from China - anything less than 20-30 dollars at this point is likely to be a non-working counterfeit. I do have a few PCB left if anyone has a chip sitting around they would like to use. Pictures and video attached. CheapTalk1.MOV CheepTalk Disk.zip CheepTalkGerbers.zip
  7. Yes - very easy build with minimal parts. I had problems pairing the bluetooth keyboard and controllers - went with the IR options and they work well.
  8. Yeah, if not using it with other devices I'm not sure you need to do the 74ls07 fix on it. I think that one would work for the tf card - it looks very similar to the one I used. I can try to look for the eeprom file if you have trouble.
  9. I had a working SDRIVE MAX and had to use AVRDUDE to read the EEPROM since the firmware requires you first calibrate a screen, which this one does not have. So I was "borrowing" the EEPROM from a working traditional one. I can't recall the AVRDUDE commands but they were not that hard. If you can program an Arduino on your computer, you should also be able to run AVRDUDE. I just bought a TF adapter from Aliexpress which has some level shifting built in and wired to the same pins that the SDRIVE MAX does - look at their schematics. I did make my own 7407 fix board under it like you see sold with the SDRIVE MAX so you don't have to do the diode fix. Same schematic you find at the SDRIVE MAX manual site. Overall I really like it being internal and one less thing to haul around. It still can be a little weird with other devices on the sio chain but I rarely use other things with it.
  10. Found a bad wipe (or 2) in the POKEY socket on the 400 motherboard - new socket fixed it - thanks!
  11. I just put a TK-II v2 into a 400 - did not hook up the console keys yet but in Memo Pad all I get is the 3 lights on the PS/2 Keyboard flashing every few seconds. Any ideas on my error? The keyboard works with the TK-II built into by 1088XEL Thanks!
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