AtariGeezer

If you have an Epyx Pitstop cart, it uses two 2764's that are socketed. They have 16k...

Just got done replacing the RF Modulator with a good one and the TV out now looks great I'll have to set up a UTube account and borrow a cam with sound so you guys can see the 2nd 1450XL made in the last 25 years... Now to get back to the case rework; I'm thinking I might make a "hot wire" cutter and carve out the rear of a 800xl in sections and re-glue them in the correct order to look more like a finished product. Also thought about trying a laser cutting diode too... Jay

Yep, speech, modem, cartridge, joy ports, sio and keyboard Nothing on the tv out yet, but the monitor works... Thanks... Edit: TV out has a bunch of snow, thought I pulled it from a good 800xl? Jay

AGENT 99 L I V E S :lust: :lust: :party: :party:

That would be from human error... I have the two sockets soldered back in and no shorts, now to repopulate the ic's... Jay

Woohoo found the short and didn't have to cut any traces There was a very fine bridge between the vias going to U7 on the bottom side, cleaned it up and no more shorts... Now to run over to the parts store and get another socket for U36 and solder that and U3's socket back in. I'll let ya know in a few hours how it goes... Jay

Same here, I should have checked the board before assembly... My last resort is to cut the trace in the "half step" method to see where that dead short is and bypass it... Jay

Yep. tried that already I even removed the sockets for U3 & U36 later last night and they were clean (I can see under U24 and that's ok). U36 has Pin#1 grounded and the clock on a trace running between pins 1 & 2 going to pin 27, but that was good too. Even resorted to the "pop" method applying a 12v battery on pins 7 & 8 of U3 and got an arc, but didn't clear the problem. I wonder if that clock line has a direct short to the ground plane? Jay

Weird, before installing the new chips today, I decided to do one last test for shorts on all IC sockets crossing over pin by pin to make sure there wasn't any shorts on adjacent pins and I found a direct short between ground and the buffered clock out from U24 pin#7. U3 and U24 have the clock on pin#7 and ground on Pin#8, but there doesn't appear to be a short caused by solder buildup between the sockets and the board...

Sounds like the dongle used in PaperClip...

Not yet, I think a few of those surplus chips are bad since it doesn't do anything , I ordered the 15 IC's today... The TV out just has wavy lines, monitor just shows a white screen briefly when turned off. I do have the power supply wired up correctly I'll check the osc out of FREDDIE with the freq counter to see how that is. On yours, does R140 & R141 get a bit warm? Q3 & Q8 is switching the -5v ok... Thanks for the tip on the cart clearance Jay

Well, the board is now finished with all parts soldered and burned the 2732A Eprom (that toothbrush sanitizer works great on erasing eproms)... Looks like it was a waste of time and money buying 15 IC's at the local surplus electronics shop, so I placed an order with digi-key for those. Now to modify the 1200xl case

Did you give Candle your address? After I sent that PM and gave him mine, I received a reply with a shipping date Yep, I'm very patient, just don't like being told something that was not truthful...

Mine still hasn't arrived yet, I guess they weren't sent on October 28th as I was told It's now been 34 days and counting, The two Ult-1mb's I bought only took 8 days...

Hey Sebastian, I received the boards today, very nice work Thank you for the very fast delivery Now to install them... Jay

Yep, I ordered the same day as you, so the early July order batch looks like it's on the way

You may be towards the bottom of the list, some July orders were supposedly sent on October 28th...

Hmmmm, 3 1/2 weeks and counting... Wish we'd get an update, hint hint Jay

I made one of these in the mid 80's after creating a schematic, but that paper is buried in a stack of drawings. Seemed to work okay on the SG-10... Jay

Thanks for the Thanks for the offer, but I found an alternative method: eBay Auction -- Item Number: 150701463786 http://www.siliconchip.com.au/cms/A_104058/article.html Jay

And today I made the order to Digi-Key for what's missing (less a few IC's that I may buy locally). Speaking of which, time to put some 2732's out in the sun to erase

I wish I knew the boards were available years ago, I could have had a few built by now When I first read about them in the works, I wanted one like yesterday... Jay

Here's my 1st progress report Starting tomorrow, I'll solder the loose components... Jay

Mine hasn't arrived yet, maybe routed by means of the slow boat to china

With 3.0rxx, it won't work on an 800, that warp speed i/o just kills it. I have had to go back to 2.5 for it to work on my 800's... Also, the 3.0rxx didn't like my 800xl either. I think FJC was having the same issue too. Jay