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What is this for?

Derek_Stewart wrote: Fri Aug 22, 2025 10:16 pm Hi,

I have just received some PCBs, I will get one built next week.

when you order the PCB?? I just made some small changes today just before post, main issue, if you order recently, is the footprint of the switch, you will need to bend the legs and enlarge the external holes.

Just a update, finally, thanks to the photos that TOnyt post, and aditional photos that B. Dixon post on facebook, I'm been able to complete the schematic and board, and It's working!!.

It's not only functional with 68K/OS, can also be used to test any ROM (it block the cartridge port as use the ...

Yes that is the reason, Shall be possible to modify the GAL code to hold the rom alwais in 0xC0000, in this way you can reset hard or soft with any memory and will continue to have floppy.
The problems of this configuration is that you can not have any other interface in 0xC0000, and that if you use ...

I'm working on incorporate RTC to my 8-in-1 ROM, I have the idea, the PCB, but not finish, and I don't have estimated time to finish.

But whatever you do, you should do with smd, because I found there is no any way to made with through-hole and be able to close the cover of the QL.

What I did was put a normal 256k expansion board between the QL and MT3 and that's when it went crazy dumping a ROM to screen

The only "normal 256Kb" interface that I know is from Quest, but I do not have the schematic, so I don't know if there are any missing line or something in the ...

What I did was put a normal 256k expansion board between the QL and MT3 and that's when it went crazy dumping a ROM to screen

The only "normal 256Kb" interface that I know is from Quest, but I do not have the schematic, so I don't know if there are any missing line or something in the expansion ...

First of all, this is a modification of my interface, I did was not aware that this version exist, and I'm not sure what it do or what kind of revision the maker use to do it, but assume that this is the last, based on the jumper of the top. (btw f|@¬½k the only things that the License of the ...

If you try and run the MT3 with just 256kb of RAM expansion it goes mad and scrolls the contents of a ROM on the screen

This is strange and shall not happend, perhaps there are some changes in the interface I'm not aware.

You can't install only MT3 and +256Kb of RAM, and alwais install the ...

First of all, this is a modification of my interface, I did was not aware that this version exist, and I'm not sure what it do or what kind of revision the maker use to do it, but assume that this is the last, based on the jumper of the top. (btw f|@¬½k the only things that the License of the PCB ...