RAM upgrade kit

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Por Guillian

Prophet (3507)

imagem de Guillian

15-05-2004, 20:05

GREAT!!
Nice to hear you made it!

Por dhau

Paragon (1570)

imagem de dhau

15-05-2004, 20:28

Yeah, somehow everything seems to work, but I was feeling like a Godzilla in a mall!

Desoldering pin 51 and grounding it as well as soldering pin 50 to CAS of the second floor of dram chips was really tough Smile I was taking a huge risk there!

So folks! Unless you are ready to ruin your MSX2+, DON'T TRY IT AT HOME!

Better buy an external mapper...

Por dhau

Paragon (1570)

imagem de dhau

15-05-2004, 20:39

Manuel,

Can you please explain how to expand WSX VRAM to 192KB?

Thanks!

Por Guillian

Prophet (3507)

imagem de Guillian

15-05-2004, 21:32

Hmmm... I made it about 10 years ago!
I saw it in a MSX Magazine, but I don't remenber the number.
It is made in a similar way you made the 512K expansion. Just add two 464 chips (i.e.: the ones you removed from your WSX) over the 2nd and 4th banks of VRAM memory next to the V9958.
Left unsoldered pin 16 (/CAS) of memory chips, and fix both with a wire. Then fix pin 16 of one that chips to a resistor (I don't remember the value!!) and the resistor to pin 59 (/CASX) of V9958.

Just check this image from turbo R:
niga.sytes.net/msx/st-vram.jpg

Anyway, since I don't remember it well, and I'm talking by heart, please try to confirm it before doing it.

Por dhau

Paragon (1570)

imagem de dhau

15-05-2004, 21:56

Thanks, man!

I will do it another time, then I have spare 2464 ICs. I already used two in SCC+. It's nice to have this, but totally unnecessary Smile

Now I have a dilemma, should I put everything back in original case, or move it in PC AT case?

Por Sonic_aka_T

Enlighted (4130)

imagem de Sonic_aka_T

15-05-2004, 22:10

Don't move it to the PC case. It tends to be very uncomfortable and you'll have a lot of trouble with your keyboard. This is how I screwed up my first Turbo-R, I accedentaly tore the ribbon cable of the keyboard. I spent about a year 'typing' by connecting a little wire between the keyboard connectors on the mainboard. Eventually, after more than a year the problem was 'solved' by connecting the keyboard from an MSX1 externally. It sure looked hella ugly though.

But seriously, you'll have lots of trouble with your keyboard unless you find a suitable external replacement, and you'll spend a bundle of money making sure all your connectors are available on the back of the computer. Not to mention having no slots accessible. It's a pain... Apart from that you have a very handsome computer and it'd be a shame to violate it Wink

Por Sonic_aka_T

Enlighted (4130)

imagem de Sonic_aka_T

15-05-2004, 22:15

You seem to have a lot of cash though... Wink Try buying one of those nifty mainboards from Padial. He has a lot of cool stuff designed to fit in a PC case. I think he even has a card designed to connect PS/2 mice and keyboards. That'd be pretty cool...

Por dhau

Paragon (1570)

imagem de dhau

15-05-2004, 23:29

I have some stuff from Padial, and if I'll move WSX mobo to PC case, I'll use it with Padial's Evolution 4 V1 slot expander with SunRise IDE controller / Serial port, 4MB mapper, 512 flash card and SCC+ extended to 128KB. The keyboard from WSX can be moved into a nice custom-made aluminum or clear-plastic case. I can use a 40 ribbon cable and standard IDE connectors to connect it to case. I like my MSX mouse, I don't want to use PS/2 mouse instead. May be it make sense to add the GFX9000 as well, and add a switch 9958 <-> 9990.

For now I've assembled everything back in original case and do some serious testing to see if my 512KB upgrade is working right.

I will only consider moving MSX to PC case if I am ready and have all necessary parts / materials.

Por A1WSX

Resident (37)

imagem de A1WSX

16-05-2004, 20:55

Hello,
My question is if I can use these Chips:

HY53425AS-70
9313T KOREA
HYUNDAI

In order to increase RAM memory of my Panasonic FS-A1 WSX of 64KBytes to 256KBytes

Thanks to all!

Por dhau

Paragon (1570)

imagem de dhau

17-05-2004, 06:35

Hey man, I'm not sure... Can't find data sheet for this IC. As long as it has all the same signals available (see many posts above) and is a DRAM chip with 262144 words of 4 bits, you should be fine. sharksym above used GM71C4400BJ70 and somehow made it work Smile

BTW: it's fairly easy to find 44256 or 44C256 ICs. Just find an electronic junk store and look for either 286 motherboards or SVGA ISA cards from circa 1989-1992. 90% of thise cards come with 44256 or 44C256. I paid about 7$ for such card with 4 x 44C256 chips.

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