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lgallair's Achievements
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The QI power supply does not have a 7905 but there is an A1012 regulator. I tested it with a DMM and found the input voltage the same as the output voltage. I have a replacement on order. Will see if that works. Thanks.
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I recapped the power supply and now the power on all rails is good except for the -5V rail. It's fluctuating around -3.3v to -3.5v. I'm not sure how to get the voltage within spec. There's a variable pot but adjusting that seems to only change the +5v rail. I had a PC power supply sitting around with the proper voltages (+5v, +12v, and -5v) so I hooked it up to the motherboard. It booted up to the same screen as before. I piggy-backed a 4116 RAM chip on each 4116 chip on the board in succession and determined the faulty chip. I de-soldered it and replaced with a socketed ram chip. I'm so happy the blown cap didn't damage the main pcb.
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Thanks for all the help guys. I recently upgraded the RAM in my Joust cocktail with 4146 so I have a bunch of 4116 RAM's to try. Was going to piggy back onto the offending RAM chip when all of a sudden, the power board went "poof" before I could even try. After the little tiny puff of smoke dissipated, I could not identify what exactly blew. I'm guessing an electrolytic cap. There is a small burn mark on the white wire which goes to the two-pin power connector. So I'm off to Digi-Key for some caps and am going to re-cap all 10 or 11 caps on the power board. Now I have at least two problems with the TI-99. Sheesh!
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A TI 99/4A QI computer recently came into my possession but sadly it has video RAM issues. According to this website, the issue is bit 5 is stuck at 0 because that screen shot is exactly the same screen I get. My problem is I do not know which chip to replace. The diagram shows the chip locations for a non-QI model. Does anyone know which 4116 chip represents the bit 5 circuit on a QI board layout?
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SOLD: Texas Instrument 99/4A Home Computer
lgallair replied to lgallair's topic in Buy, Sell, and Trade
Yes, shipping would be extra. If you PM your address I can provide shipping quotes. -
I am selling a working TI-99/4A computer. A friend of mine gave me this computer which he had since he was a kid. It appears to work fine. I say this only because I turned it on and heard some beeps and the logo screen and prompt. I typed out the alphabet and all the letters appeared on the screen. I have not tested this computer beyond that. The computer comes with the following items ... - power adapter - RF box (please note that the spade terminals have been cut off) - a custom composite video cable Condition of the computer ... - the gray/silver covering has some pitting from the clear finish - there are some scratches/dents on the metal covering - all keys are good, none are broken - the cables on the power adapter are fine, no exposed wiring or damage Askng $40. I live in eastern Canada but can ship internationally.
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I may have one that suits your needs. It a breadbin with a power supply and box. I'll have to dig it out and take pix if you're interested. Also, shipping would be from Canada.
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Would you be willing to ship to Canada?
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This fellow bought an item from me and the transaction went super smooth. Payment was fast. Communication was excellent. Would definitely sell (and buy) from him again. AAA+
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I have a Megacart for the Commodore Vic-20 that I would like to put up for sale if anyone is interested. I paid $100 for it several years back and would like to re-coup my costs if possible. I am located in Canada but I'm willing to ship worldwide to any interested buyers. Comes from a smoke-free home if that makes any difference. It also comes with a home-made instruction booklet that fits inside the case. Shoot me a PM here or an email at Lorne.Allaire@Gmail.com I check my email more frequently than this website. I accept PayPal only. Will consider interesting trades as well. Anything from that era in terms of computers or gaming consoles. Thanks for looking.
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Email sent for Vic-20 computer.
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Great job! The grid between "Arcade System" and 'Brings real arcade play home" is a bit off. Other than that, it looks awesome.
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Not sure if this is what you wanted, but here's the dimensions off of my Vectrex box. Let me know if there's any other dimensions you require.
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I have a Vic-20 Mega-cart I might be willing to sell. I mostly use my uiec/sd device for my vic-20 needs.