Help to fix my Trump Card Mini

[javier2112]

any chance you could supply some pics (reasonable resolution) of the top and bottom of the card?

OK:
https://photos.app.goo.gl/xqRb6NAnSBrzhmPE9

[dilwyn]

(...)
In some versions of QDOS (<= v1.03) there is an obscure bug which prevents more than one card with onboard ROM from being recognised in the peripheral ROM areas, as described by Andrew Pennell in his Sinclair QDOS Companion book, here's an extract:

https://dilwyn.theqlforum.com/docs/hardware/PeriROMs.pdf

Superbasic reports JM as QDOS version, so I think the problem is that. I'll tell you when I receive the Miverva EPROM from Chris.

Thank you all.

Ah yes, a JM ROM has QDOS v1.03.

That might explain why the cards work individually, but not together.

Back in the 1980s, I remember a struggle trying to get a disc interface and a RAM card from different manufacturers to work together. The RAM card didn't have a through connector, so I was trying to make them work together using a passive two slot expander. I did eventually get them to work with a different adaptor, but it was a bit frustrating at the time.

[Derek_Stewart]

Hi

looking at some the photographs of the Trjmp Card Mini, some of the soldered joints look a little suspect, maybe ther is a hardware issue with "dry joints" that need reflowing.

Do not use JM, it is full of bugs, and extenstions fo not extend the system correctly, JS fixes most things, Minerva makes the system better.

I had problems with QubATA and JM roms, the partition table would get updated correctly, changing for JS or Minerva everything workd,

[jobdone]

Ok, the first thing I saw was the DIN41612 the opposite way around. Alvaro assures me yours is correct and he's currently changing Git.

[jobdone]

The other one that sticks out, is your working image does not show tk2 2.26, but all the ones that do not work are showing TK2 2.26. where is this loading from?

[javier2112]

I received the Minerva ROM last Friday. I replaced the Sinclair ROM but things remained the same, so I followed the Derek's advice. Then I discovered a bad solder joint in one diode. I fixed it, and now it works as expected.

Thank you all for your help!

Regards.

[aalea]

The other one that sticks out, is your working image does not show tk2 2.26, but all the ones that do not work are showing TK2 2.26. where is this loading from?

This is a interesting thing, we discover, the hard way, that the Trump ROM 2.19 only show the TK2 message if there is additional RAM, if you have a 0K version only show the trump message.

In the opposite, the ROM 2.17 will show the TK2 message with or without RAM.

In any case, I wondering, for the QDos <1.03 with the bug of initialization, there is a workaround, is there any list of ROMS that implement this? is there any patch to apply to the roms to make it compatible?