Thanks! I read most of that but didn't find the diameter specs
On Tue, Nov 28, 2023 at 9:30 PM Brian White <b.kenyo...@gmail.com> wrote: > > https://gist.github.com/bkw777/52d85d89eeff8445cc667685d05ea94d > > includes some links to sources as well as specs > > 26 awg or 0.4mm > > > bkw > > On Tue, Nov 28, 2023, 8:59 PM Mike Stein <mhs.st...@gmail.com> wrote: >> >> I probably missed it and can't easily find the previous discussion, >> but what diameter wire do you suggest? I see the hole size 0.6mm/24 >> mil but not the wire gauge. >> >> Thanks! >> >> On Tue, Nov 28, 2023 at 7:56 PM Brian K. White <b.kenyo...@gmail.com> wrote: >> > >> > You have lost me. >> > >> > If you want to dump or re-write the flexrom, you can just do it it it's >> > programming adapter. >> > >> > I thought you wanted to dump the original rom? >> > >> > And if you want to avoid all the hardware actions while changing the >> > main rom, that's exactly what REX Classic allows. It's purely software >> > once you set that up, and even if you botch both primary and secondary >> > images, you only need to open the option rom compartment instead of the >> > whole machine to revert to the internal eeprom. >> > >> > If you have a soic-28 test clip, you *might* be able to program the >> > eeprom without removing from the machine. Mostly it should be ok, the >> > board allows the programmer to drive /WE for instance, it's definitely >> > ok to program the chip directly with a test clip if the board is not >> > installed in the machine. But but one thing I don't know is, if the >> > board is installed in the machine, all the pins are connected to the >> > bus. Mostly that should be ok but one thing I don't know is what happens >> > when the programmer tries to provide power on the vcc pin? Does it power >> > up the whole machine? Even with the memory power switch turned off, >> > which normally kills everything, this would be injecting power to the >> > rail from a point "inside the walls". >> > >> > If you're worried about the legs, and you're right that it would be a >> > pain to repair a loose one after the frame was cut away, I now actually >> > prefer gold plated plain brass wire. >> > https://gist.github.com/bkw777/52d85d89eeff8445cc667685d05ea94d >> > >> > The advantages are, >> > - just wire, no special shapes to cut off or anything, no single special >> > supplier >> > - a few feet makes hundreds of 6mm legs >> > - the wire is round, so there is no problem with it rotating when >> > loosened and resoldered >> > - gold plated >> > - repair/replacement of a broken leg is trivial >> > >> > The disadvantages are, >> > - each leg has to be soldered individually, no one-piece connector or >> > frame like with a normal pin header >> > - no simple supplier to point to, it's such a generic thing that there >> > is no part number or such, except in large quantities from bulk >> > suppliers. The various suppliers (for small quantities) I've found have >> > all been transient like Etsy or Ebay links that don't work a year later. >> > And it's easy to end up with gold colored aluminum wire or brass wire >> > that isn't gold plated (which starts tarnishing within a year), since no >> > one selling the stuff is writing their descriptions for electronics use. >> > I have also gotten wire from aliexpress that was thinner than claimed, >> > which ends up being too thin and weak despite you buying the correct awg >> > or mm number. >> > >> > But if you do get some, then you have a lifetime supply after that. >> > >> > The preloaded bom carts with the pcbs have the sil leadframes just >> > because it's an actual part that can be ordered normally along with >> > everything else, and is both a little cheaper and a little more >> > convenient to solder than the MillMax or Keystone micro pins which could >> > also be ordered as part of the bom. >> > >> > -- >> > bkw >> > >> > On 11/28/23 13:32, runrin wrote: >> > > This is a good idea, but I've already got my new EEPROM in there and >> > > every time I remove it and put it back in, I get worried I'll break off >> > > one of the legs and have to resolder it. >> > > >> > > The leadframes used to make DIP pins on Brian's FlexROM adapter board >> > > work well, but I really don't want to have to replace them when I >> > > inevitably break one off. >> > > >> > > Would you use a BASIC script to do this Mike? Just a loop to PRINT each >> > > byte to the COM port? >> > > >> > > On Tue, Nov 28, 2023 at 11:45:10AM -0500, Mike Stein wrote: >> > >> Why not just dump it out of the M100 directly? >> > >> >> > >> On Tue, Nov 28, 2023 at 9:50 AM Brian K. White <b.kenyo...@gmail.com> >> > >> wrote: >> > >>> >> > >>> On 11/27/23 11:48, runrin wrote: >> > >>>> Do you know if it's possible to dump the original ROM using the >> > >>>> programming adapter for the FlexROM 100? >> > >>> >> > >>> Maybe. >> > >>> >> > >>> There are two things to worry about and I'll just think out loud right >> > >>> here. >> > >>> >> > >>> 1 >> > >>> The programming adapter presents a pinout for a 28C256, not a 27C256 or >> > >>> mask rom. Those are only a couple wires different, but then again, >> > >>> since >> > >>> it's just for reading, and the read cycle is the same, you could just >> > >>> tell the programmer that it's reading a 28C256 (force it, override chip >> > >>> id detection), and that won't hurt the rom. >> > >>> >> > >>> 2 >> > >>> Pin 23. The programming adapter routes pin 27 from the programmer (/WE >> > >>> if a 28C256 were in the programmer) to pin 23 of the DIP socket, which >> > >>> is ALE on the LH535618 rom, but the flexrom board connects it to the >> > >>> /WE >> > >>> pin on the actual 28C256 on the board. >> > >>> >> > >>> I *think* what you want to do is take a DIP-28 socket and bend out pin >> > >>> 23, connect the bent-out pin 23 to pin 27, put the modified socket into >> > >>> the programming adapter and then the old rom into the modified socket. >> > >>> Then tell the programmer to read a 28C256 and ignore chip id. The >> > >>> socket >> > >>> is just to avoid bending the leg on the old chip. >> > >>> >> > >>> IE, feed /CE from the programmer to both /CE and ALE on the chip, and >> > >>> don't connect anything to /WE at the programmer. >> > >>> >> > >>> But, at that point it's almost simpler to just make the entire adapter >> > >>> manually with two dip sockets and wires. Especially since it's a >> > >>> one-off. In that case, use a 27C256 pinout and tell the programmer to >> > >>> read a 27C256 instead of 28C256. >> > >>> >> > >>> But if your chip has any of these part numbers, then it's already been >> > >>> dumped. >> > >>> https://bitchin100.com/wiki/index.php?title=Model_and_ROM_information >> > >>> >> > >>> -- >> > >>> bkw >> > >>> >> > >> > -- >> > bkw >> >
