Yes, but, then it's this oddball accessory that you must keep around, and labeled, and still end up just losing after a while, and your grandnephew never knows what it's for a few years later in a box of mystery parts.
Or you could just stuff a piece of paper right in the cavity near the main rom with a drawing showing how to take 2 bog standard dip 28 sockets and 28 bog standard pre-made male-female jumper wires and where to run the wires. Weighs nothing, is free, can't get lost, and gives the future owner/user all they need. Still, a basic board with dip pins on one side and a dip socket on the other would be probably the best all around way to go if you don't mind building it along with building the main rom adapter itself. Although I soldered the figtronix adapter into 2 of mine, and my new rom is removable, it really would be more ideal if the original socket didn't need to be removed, and I could pop the original rom right back in any time just on principle. I did actually manage to de-solder both original sockets without wrecking them, so I *could* put it all back to stock including the actual original sockets. On Wed, Aug 23, 2017 at 8:52 PM, John Gardner <[email protected]> wrote: > ...You could make a board where the chip is soldered on, and that > would fit in the original socket. The problem then is, that chip > would not be re-programmable very easily, because the combined > chip-on-adapter creates a non-standard pinout that a programmer > doesn't support... > > A pgming adapter sounds doable - And cheap... > > > > > On 8/23/17, Brian White <[email protected]> wrote: > > The problem is that the new adapter is too tall for the available space, > if > > it's plugged in to the original socket. > > > > The reason it's too tall is because of the plcc socket. Through-hole > style > > plcc sockets are pretty tall. > > > > The way that adapter works, you lose the ability to plug the original rom > > back in, but but the new rom is removable and rewriteable without any > > further special adapters. You just pop the bare chip out and it pops > into a > > standard reader, with an adapter too, but a standard one that comes with > > the reader just to adapte the physical form, notrearrange pins into a > > special pinout. > > > > There are lots of possible work-arounds, but they all have some kind of > > down-side just like desoldering the original socket is a down-side. > > > > You could make a board where the chip is soldered on, and that would fit > in > > the original socket. > > > > The problem then is, that chip would not be re-programmable very easily, > > because the combined chip-on-adapter creates a non-standard pinout that a > > programmer doesn't support. > > > > You would have to make a "reverse adapter" to ever reprogram later, or > get > > a test-clip that clips righ onto the chip on the board. > > > > I *think* it should bebpossible to make an adapter that plugs in to the > > original dip socket and still has a plcc socket itself, by using a > surface > > mount plcc socket instead of a throu-hole one. There is a figtronix > option > > rom board that uses that. I have made a few and they work. But the > > down-side in *that* case is that a low profile surface mount plcc socket > > can only be soldered with an oven or hot air and paste. It's MUCH simpler > > to solder the through-hole kind for the average hobbyist. I have managed > > it, and did it using a cheap $20 hot air gun instead of a $60-$500 "real" > > hot air soldering station, but it was tricky and finnicky and not > reliably > > reproduceable. I also botched it several times and had to keep starting > > over. (heat it all up enough to come off, clean off all solder, and start > > over very carefully applying new paste and flux and trying lay the socket > > in exactly the right position...) > > > > No mmatter which way you turn, there is either one problem, or some other > > problem. > > > > Mike Stein has a board that uses a full dip chip, and can plug in to the > > original socket, but I don't think it can accomodate a socket to make the > > new, standard 27C256 removable for reprogramming and still all fit in the > > case. If it can, that would be the way to go. Otherwise it's just one of > > many equally good-with-a-problem options. > > > > Remember, this is all only for M100's that have the original non-standard > > pinout main rom. Some late M100's and all T102's don't have any problem > and > > don't need any adapter. > > > > -- > > bkw > > > > On Aug 23, 2017 5:18 PM, "Gary Weber" <[email protected]> wrote: > > > >> Hello all, > >> > >> I have a question for anyone out there who has created a main ROM > adapter > >> for their Model 100, using these parts and following these instructions: > >> http://tandy.wiki/FigTronix#Model_100_Main_ROM_27C256_PLCC_Adapter > >> > >> My question has to do with this statement: > >> "Unfortunately, using this adapter requires desoldering the original > >> socket from the motherboard. It IS possible to do this, without damaging > >> either the motherboard or even the old socket, with flux, solder wick, > >> and > >> patience." > >> > >> I'm a little confused as to why the original socket would have to be > >> de-soldered. Can't this adapter just be plugged into an empty CPU > >> socket? > >> Or is it the case that the M100 case can't close again because of > >> something > >> so high in that socket pressing against the keyboard circuit-board? > >> > >> Thanks for the info! > >> > >> > >> -- > >> Gary Weber > >> [email protected] > >> > > >
