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Post by Pyrofer on Jan 18, 2018 20:07:07 GMT
Ok, so this is product placement if ever there was any (feel free to delete if it breaches any rules) but I wanted to show you guys the fruits of labour over the last few months. www.pyrofersprojects.com/blog/product/556/It's basically an option ROM but contains 8 different images. The first is a menu selection pick which ROM you want active and the other 7 are normal option ROMs. The menu selection ROM also has ram tests, video test cards and a JiffyDOS selection that allows you to turn off and on older "Switched" JiffyDOS installs by replacing the toggle switch with a wire from this board. It remember state through power down so no re-selecting the ROM every time you turn it on, it stays as you left it. |
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Post by molebrain on Jan 19, 2018 14:08:08 GMT
hey! that's pretty cool for sure.
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Post by robertb on Jan 20, 2018 8:20:07 GMT
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Post by hydrophilic on Jan 24, 2018 5:51:00 GMT
That sounds really cool (and no rule violations I see).
But can you explain how it remembers the state after power-down?
Sure I/we can follow the link if bored (time to kill), but if you can write a little more detail we would appreciate it!
Following your link I didn't find much more detail (perhaps I missed something?)
I did see that you are "Out of Stock" which (I presume) means business is good?! Always nice to see a fellow Commie succeed!
Anyway, Happy New Year and thanks for sharing your "C128 Multi-ROM" with us!
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Post by Pyrofer on Jan 24, 2018 16:03:47 GMT
It's artificially out of stock while I try and make the installation idiot proof. We are waiting for new cable clips that can easily be attached to the pin of U3 (existing ones suck).
It stores the state in eeprom contained inside the PIC micro controller that actually does the rom selection. When you set menu options data data is actually written to an unused memory address that is decoded by U3 inside the 128, the PIC sees that and saves it.
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Post by robheaton on Apr 27, 2019 8:50:13 GMT
Hi,
Did you manage to finish this?
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Post by Pyrofer on Apr 28, 2019 19:58:48 GMT
Yes, sorry. I have a pile of boards to solder up and test.... Not long now.. I promise!
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Post by robheaton on Apr 29, 2019 6:07:57 GMT
Hehe no problem, I was just debating buying a rom burner to write a servant ROM, but I might wait!
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Post by 8bitheaven on May 5, 2019 14:43:19 GMT
Does this MultiROM chip work on the C128D? There is only one Jiffydos chip for the "D" that contains jiffydos for the 64 and 128D
Thanks
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Post by Pyrofer on May 8, 2019 18:00:17 GMT
The multirom works on ANY C128. They all have the U36 option rom slot where it fits.
The option to control JiffyDos is simple an output from the board (1 or 2 wires) that go to the address select on your JD Rom. The roms have to be laid out in such a way as the select lines work, but if you have a JD with a switch you can control it with this instead.
This does NOT replace or include any kernal/JiffyDos rom. It simply has the switching output to control which rom bank is selected if a suitable one is installed.
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