Carnivore2 request for help

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By Pencioner

Hero (647)

Pencioner's picture

22-06-2018, 15:05

Thanks for reply! Of course i didn't try that but good to know that you should be careful on AS socket as well

By djh1697

Paragon (1358)

djh1697's picture

24-06-2018, 00:40

I was using a C2 cartridge on a Toshiba HX10 MSX1 at the Retro Computer Museum this afternoon. It worked very well, it will be sad when the owner requires me to send it back, thank you Mark!

The only difference on the functionality, with my Sony HBF9S, is that on the boot screen i can press ESC to get the machine to boot Nextor, on the HX10 i have to select the first option. Unfortunately MSX2 games will not work on the MSX1, the cartridge is good, but it cannot do the impossible. However it allow me to have a massive 970Kb RAM disk, why would i ever need that on a diskless MSX1? Big smile

By mxmy

Resident (39)

mxmy's picture

28-06-2018, 06:21

mxmy wrote:

Also: Sockets. I'm putting in some G**D*MN sockets too!

Mmmmm, sockets....
:RNFF:

By mxmy

Resident (39)

mxmy's picture

30-06-2018, 01:59

Nervously, I modded some 4164 RAM chips (cut off pin 1, lifted pin 8 and soldered it across the top to pin 9, then added some insulation tape to prevent any possible short through the keyboard PCB) and booted up my MSX aaaand....

IT WORKS! IT'S ALIVE AGAIN!

Should be solid for another 3 and a half decades at least! Also, having sockets is really awesome, too!

If I could go back and do it again, though, I would have soldered a wire around the side of the IC between pins 8&9. The electrical tape looks good and should be quite effective, but it's not a 100% ideal solution.

By Grauw

Enlighted (7353)

Grauw's picture

30-06-2018, 02:13

mxmy wrote:

IT WORKS! IT'S ALIVE AGAIN!

Woohoo! Big smile

By mxmy

Resident (39)

mxmy's picture

30-06-2018, 08:12

I love a happy ending ^_^

By gdx

Prophet (2206)

gdx's picture

30-06-2018, 09:17

Congratulations!

It is better to remove the electrical tape from the VRAM because the tape will not age well with the heat even if they do not heat much. It's not necessary to pick up the pins. The pin VDD is the same as 4116 and A7 must be connected to the low or high signal. So it is best not to lift it. Just check what to do for A7. (Check where it is connected to the PCB. If it is not, connect it to the 5V or GND with a 10K or 4.7K resistor)
Also if you want to extend a little the life of the VRAMs, replace the resistors (marked "Cxxx") by a ceramic capacitors of 100nF (0.1μF) (one for each VRAM is enough).

By mxmy

Resident (39)

mxmy's picture

01-07-2018, 19:46

gdx wrote:

It is better to remove the electrical tape from the VRAM because the tape will not age well with the heat even if they do not heat much.

That is very useful to know! As the pins are soldered and functioning already, what method would you recommend to prevent the pins from being shorted on keyboard above? I was thinking hot glue might work, but it'll probably be very ugly. Perhaps some Sugru would work well?

By Alexey

Guardian (1604)

Alexey's picture

01-07-2018, 22:00

Use the small diameter shrinktube for each lifted pin.

By mxmy

Resident (39)

mxmy's picture

02-07-2018, 03:52

The pins are already soldered (had to use a bit of extra wire that I recycled from the ends of resistors), so I'd really rather not have to desolder them again to put in the heatshrink. it also means that they're soldered midway across the ic, so the heatshrink tubes would be hard to shift out of the way to reperform the sodlering. Seriously considering using sugru as I can apply it without desoldering and resoldering the join.

Ultimately, if the 4164 ram chips go bad at any point, I'll look at a better solution (probably by putting in a bit of wire across the side of the IC)

EDIT:

Ok, so my sugru was waaay out of date, so I decided to snip one side of the connected pins and feed some heatshrink in and resolder after all...

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