Re: [M100] replacement Molex 8878 socket?
On 3/8/20 6:45 PM, Dave Everett wrote: On 8/03/2020 9:04 am, Brian K. White wrote: On 3/7/20 4:42 PM, Dave Everett wrote: On 8/03/2020 8:27 am, Brian K. White wrote: I think you want a carrier rather than a socket then ? As it happens, I also have over 100 carriers too, and you can have some no problem. But you can also get carriers 3d printed new. There are at least two STL files out there publicly to get carriers 3d printed from on-line services any time you want for about $5 each. The carriers are easy since they are just a chunk of plastic. The sockets are hard because you can't just 3d-print the pins. I'll try printing one, thanks mate. Dave Here's the carrier for printing. https://www.shapeways.com/product/QF7XZHLJV/molex-dip-28-chip-carrier-78802-0010?optionId=65447013=marketplace Here's the STL file to get it printed somewhere else besides Shapeways. https://www.thingiverse.com/thing:2904190/files That's not me or my model but it looks good to me. The carrier I designed holds a PCB not a DIP chip. If you want to try to get it printed elsewhere, you need to know that you have to use SLS printing. It means laser sintered nylon powder. Everything else is either too inaccurate or too fragile. I have no idea who offers SLS printing in AU. I think both Shapeways and Sculpteo ship world wide, but surely there must be someone closer to you. Steve Adolph is in Canada and we managed to find a Canadian shop for him for the carriers for his new REXCPM coming out soon. You might try a site called CraftCloud. They aggregate several print services into a single search site. You upload the STL file, set your location and currency, select the type of printing and material (SLS nylon), and they show you quotes from different suppliers. But like I said in another email, you probably do want a socket also so that you can re-write the rom without bending the pins again to get the chip off the carrier. So, if you want a socket anway for reading & programming, it's nothing extra for me to toss in a few carriers. And that other "Meeprom" thing I posted with a pcb is just an option. Kind of fancy but I like it for my Model 100/102/200's. Maybe it makes more sense for 100/200 etc because they have a non-standard pinout that the programmer does not support. A socket still doesn't work without also some form of wiring adapter, and at that point the test clip is simpler. But for a PX-8 or a tandy model 600, since the pinout is standard, then as long as you don't mind using 27C256 chips and a UV eraser, it's simple to just plug a socket in the programmer, and you can read/write the rom without taking it off it's carrier. -- bkw
Re: [M100] replacement Molex 8878 socket?
On 8/03/2020 9:04 am, Brian K. White wrote: On 3/7/20 4:42 PM, Dave Everett wrote: On 8/03/2020 8:27 am, Brian K. White wrote: I think you want a carrier rather than a socket then ? As it happens, I also have over 100 carriers too, and you can have some no problem. But you can also get carriers 3d printed new. There are at least two STL files out there publicly to get carriers 3d printed from on-line services any time you want for about $5 each. The carriers are easy since they are just a chunk of plastic. The sockets are hard because you can't just 3d-print the pins. I'll try printing one, thanks mate. Dave -- This email has been checked for viruses by AVG. https://www.avg.com
Re: [M100] replacement Molex 8878 socket?
Welll that was supposed to be off-list. Good thing it wasn't sensitive. :) And the note about the short legs is good to post anyway. On 3/8/20 6:26 PM, Brian K. White wrote: Hi Brian, I have been looking for one of these to make a basic rom for my PX-8. Would you be prepared to send one to Australia? If so lease let me know how much you want including shipping. Sure, send me an address and I'll find out what the shipping will be. How about a socket and and 2 carriers with 27C256 already installed? Or 2 sockets, one in case you ever need to repair one, and one just to use in a programmer? The legs on the sockets are pretty short and they don't actually reach down into the ZIF socket on a programmer very well, plus the clamping lever gets in the way because the socket is much larger than a chip. So you want to take a regular dip socket and clamp that in the programmer first, and then stick the molex socket into that. I can toss in a regular socket too if you don't happen to have one. -- bkw
Re: [M100] replacement Molex 8878 socket?
Hi Brian, I have been looking for one of these to make a basic rom for my PX-8. Would you be prepared to send one to Australia? If so lease let me know how much you want including shipping. Sure, send me an address and I'll find out what the shipping will be. How about a socket and and 2 carriers with 27C256 already installed? Or 2 sockets, one in case you ever need to repair one, and one just to use in a programmer? The legs on the sockets are pretty short and they don't actually reach down into the ZIF socket on a programmer very well, plus the clamping lever gets in the way because the socket is much larger than a chip. So you want to take a regular dip socket and clamp that in the programmer first, and then stick the molex socket into that. I can toss in a regular socket too if you don't happen to have one. -- bkw
Re: [M100] replacement Molex 8878 socket?
On 3/7/20 4:42 PM, Dave Everett wrote: On 8/03/2020 8:27 am, Brian K. White wrote: On 3/7/20 11:22 AM, Stephen Adolph wrote: hi, has anyone ever come across a supplier today for the ModelT optrom socket, the Molex 8878? I could use a few new ones. thanks, Steve I scored a load of about 100 of them on ebay a couple years ago. I have been giving them to whoever needs them for any use I consider legitimate like that. IE, they aren't replaceable, so, I won't just consume them for something dumb, but for repairs of old machines and maybe a small number of programming jigs or something. I gave some to a museum to have in inventory for repairs. If I die and still have 75 of them and someone else keeps them and dies with still having 60 of them, and so they are available for repairs for the longest time possible, and 50 years from now there is still a box of 50 of them... that is my ideal goal. Hi Brian, I have been looking for one of these to make a basic rom for my PX-8. Would you be prepared to send one to Australia? If so lease let me know how much you want including shipping. Thanks, Dave Everett Sydney, NSW Australia I said before maybe you meant the carrier not the socket, but I guess you would want a socket too, so that you could re-write an eprom without bending the chip legs again. Also for copying old original roms. No problem. But just for the record, here is another option. I made a version of Teeprom that has a standard 27C256 pinout instead of the special Model 100/102/200 pinout. http://tandy.wiki/Meeprom (Molex EEPROM) It's more complicated than just putting a dip chip on a carrier, but the point is it has a re-writable EEPROM on it instead of a UV EPROM, and you can write it with a generic SOIC-28 test clip instead of the special Molex socket. The test clips are a bit expensive at $35, but the point is they are at least a generic standard replaceable thing where anyone can get one any time. -- bkw
Re: [M100] replacement Molex 8878 socket?
I remember a discussion a year or 2 back about 3D printing them. Someone posted files on ThingiVerse here -> https://www.thingiverse.com/thing:3821586 On 3/7/20 4:42 PM, Dave Everett wrote: On 8/03/2020 8:27 am, Brian K. White wrote: On 3/7/20 11:22 AM, Stephen Adolph wrote: hi, has anyone ever come across a supplier today for the ModelT optrom socket, the Molex 8878? I could use a few new ones. thanks, Steve I scored a load of about 100 of them on ebay a couple years ago. I have been giving them to whoever needs them for any use I consider legitimate like that. IE, they aren't replaceable, so, I won't just consume them for something dumb, but for repairs of old machines and maybe a small number of programming jigs or something. I gave some to a museum to have in inventory for repairs. If I die and still have 75 of them and someone else keeps them and dies with still having 60 of them, and so they are available for repairs for the longest time possible, and 50 years from now there is still a box of 50 of them... that is my ideal goal. Hi Brian, I have been looking for one of these to make a basic rom for my PX-8. Would you be prepared to send one to Australia? If so lease let me know how much you want including shipping. Thanks, Dave Everett Sydney, NSW Australia
Re: [M100] replacement Molex 8878 socket?
On 3/7/20 4:42 PM, Dave Everett wrote: On 8/03/2020 8:27 am, Brian K. White wrote: On 3/7/20 11:22 AM, Stephen Adolph wrote: hi, has anyone ever come across a supplier today for the ModelT optrom socket, the Molex 8878? I could use a few new ones. thanks, Steve I scored a load of about 100 of them on ebay a couple years ago. I have been giving them to whoever needs them for any use I consider legitimate like that. IE, they aren't replaceable, so, I won't just consume them for something dumb, but for repairs of old machines and maybe a small number of programming jigs or something. I gave some to a museum to have in inventory for repairs. If I die and still have 75 of them and someone else keeps them and dies with still having 60 of them, and so they are available for repairs for the longest time possible, and 50 years from now there is still a box of 50 of them... that is my ideal goal. Hi Brian, I have been looking for one of these to make a basic rom for my PX-8. Would you be prepared to send one to Australia? If so lease let me know how much you want including shipping. Thanks, Dave Everett Sydney, NSW Australia I think you want a carrier rather than a socket then ? As it happens, I also have over 100 carriers too, and you can have some no problem. But you can also get carriers 3d printed new. There are at least two STL files out there publicly to get carriers 3d printed from on-line services any time you want for about $5 each. The carriers are easy since they are just a chunk of plastic. The sockets are hard because you can't just 3d-print the pins. You would want a socket if the socket in your PX-8 was broken, or if you wanted to make a programming adapter to read old roms without un-bending the legs and risking breaking them. Either way, sure whatever you need. -- bkw
Re: [M100] replacement Molex 8878 socket?
On 8/03/2020 8:27 am, Brian K. White wrote: On 3/7/20 11:22 AM, Stephen Adolph wrote: hi, has anyone ever come across a supplier today for the ModelT optrom socket, the Molex 8878? I could use a few new ones. thanks, Steve I scored a load of about 100 of them on ebay a couple years ago. I have been giving them to whoever needs them for any use I consider legitimate like that. IE, they aren't replaceable, so, I won't just consume them for something dumb, but for repairs of old machines and maybe a small number of programming jigs or something. I gave some to a museum to have in inventory for repairs. If I die and still have 75 of them and someone else keeps them and dies with still having 60 of them, and so they are available for repairs for the longest time possible, and 50 years from now there is still a box of 50 of them... that is my ideal goal. Hi Brian, I have been looking for one of these to make a basic rom for my PX-8. Would you be prepared to send one to Australia? If so lease let me know how much you want including shipping. Thanks, Dave Everett Sydney, NSW Australia -- This email has been checked for viruses by AVG. https://www.avg.com
Re: [M100] replacement Molex 8878 socket?
interesting, well, I'm not in urgent need because some of my laptops naturally die. But I had to replace the one on my heavily used "test jig" for REX, REXCPM etc. BTW, which version of Molex is it? M100 style or (older) T102/T200 style (newer) On Sat, Mar 7, 2020 at 4:27 PM Brian K. White wrote: > On 3/7/20 11:22 AM, Stephen Adolph wrote: > > hi, has anyone ever come across a supplier today for the ModelT optrom > > socket, the Molex 8878? > > I could use a few new ones. > > thanks, > > Steve > > I scored a load of about 100 of them on ebay a couple years ago. I have > been giving them to whoever needs them for any use I consider legitimate > like that. > > IE, they aren't replaceable, so, I won't just consume them for something > dumb, but for repairs of old machines and maybe a small number of > programming jigs or something. I gave some to a museum to have in > inventory for repairs. If I die and still have 75 of them and someone > else keeps them and dies with still having 60 of them, and so they are > available for repairs for the longest time possible, and 50 years from > now there is still a box of 50 of them... that is my ideal goal. > > So, that's a yes. :) > > -- > bkw >
Re: [M100] replacement Molex 8878 socket?
On 3/7/20 11:22 AM, Stephen Adolph wrote: hi, has anyone ever come across a supplier today for the ModelT optrom socket, the Molex 8878? I could use a few new ones. thanks, Steve I scored a load of about 100 of them on ebay a couple years ago. I have been giving them to whoever needs them for any use I consider legitimate like that. IE, they aren't replaceable, so, I won't just consume them for something dumb, but for repairs of old machines and maybe a small number of programming jigs or something. I gave some to a museum to have in inventory for repairs. If I die and still have 75 of them and someone else keeps them and dies with still having 60 of them, and so they are available for repairs for the longest time possible, and 50 years from now there is still a box of 50 of them... that is my ideal goal. So, that's a yes. :) -- bkw
Re: [M100] replacement Molex 8878 socket?
I bought a few from someone in the list a few years ago. IIRC he had to buy them in qty 100 to get the few that he needed. If that person is on the list still, I could use a few more, in fact. On Sat, Mar 7, 2020, 11:22 AM Stephen Adolph wrote: > hi, has anyone ever come across a supplier today for the ModelT optrom > socket, the Molex 8878? > I could use a few new ones. > thanks, > Steve >
