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| Who did made the Memory Mapper hacks?
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Yukio
msx professional
Berichten: 773 |  Geplaatst: 25 Oktober 2007, 20:24 |
How often is this?
Do you know any MSX2/2+ or even a Turbo R machine with a expanded Memory Mapper inside the main board?
Also, who Added the extra 64KB RAM to the MSX 2/2+ VRAM ?
Is this something previous projected by the manufactures? Like a "easy" add-on the board?
Some demonstrations and "intros" would need a MSX 2 with RAM expansion.
Also, external (normal) RAM cartridges (extra RAM banks on other slots) would be very neat. Imagine some extra KB's of RAM on external slots ...
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Jipe
msx freak
Berichten: 184 | Geplaatst: 25 Oktober 2007, 22:15 |
i know : my 8280 with 4Mo Ram , my GT with 1Mo Ram and 192K Vram make himself
but i don't understand your mail
what do you want exactly ??
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manuel
msx guru
Berichten: 3368 | Geplaatst: 25 Oktober 2007, 23:46 |
I must say, with many of Yukio's posts I have trouble understanding what the point is... Yukio, no offence, but can you please try to be clearer when you send a post? Also, do you realize that you replied to posts that are about 5 years old?
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cax
msx professional
Berichten: 1009 | Geplaatst: 26 Oktober 2007, 09:42 |
I think Yukio is puzzled by existence of demos/intros that require more RAM than standard (not modded) machines have.
He wants to know how many people have extended their RAM, and was it something easy-to-install that can explain the (probably) large amount of extended machines that can run the software mentioned above.
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Jipe
msx freak
Berichten: 184 | Geplaatst: 26 Oktober 2007, 22:36 |
extend the internal ram in all MSX is not easy and required patience and dexterity for solder component and read schematic
no break your MSX if you are not very sure
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mohai
msx lover
Berichten: 118 | Geplaatst: 17 November 2007, 18:07 |
Jipe, you are right. do not try to modify your MSX if you are not sure what you are doing or following extrict instructions.
By the way, maybe Yukio is right. He is asking if expanding RAM is easy, as if manufacturer thought of future DIY expansion kits or something...
Think about Philips MSX-2: Only 128K RAM, but mapper chips DO support 256K, but they never used the extra bit...
I know RAM was expensive then, but why Philips did put the 128K top?  |
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CrazyBoss
msx freak
Berichten: 144 | Geplaatst: 17 November 2007, 19:09 |
Actually when i first read the headline, i though he means, who made the megarom hacks  but i guess its not what he ment.
-Claus-
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Jipe
msx freak
Berichten: 184 | Geplaatst: 18 November 2007, 14:46 |
see Mega-Sram , Megaram , or other electronic solution
hacks megaroms in the internal mapper is not the best choise
internal mapper have memory block of 16k and many cartridge have 8k konami , scc , ascii
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CrazyBoss
msx freak
Berichten: 144 | Geplaatst: 18 November 2007, 23:48 |
Sure, but sometimes they just waste memory
so a 128kb megarom need 256kb mapper
And mostly if MSX1 megaroms they used the VRAM too.
-cb-
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emersonwsm
msx friend
Berichten: 4 | Geplaatst: 19 November 2007, 02:10 |
My brazilian Gradiente model Expert 1.1 (MSX 1) have a mapper decoder board and the original 64KB bank (8 4164 chips) was changed to a 256KB (8 41256 chips) in the MSX main board.
The decoder board is connected to a fisical slot without adress the logical slot. On the back panel of the Expert exist a 50-pin connector that mirror the frontal slot B (logical slot 3). A flat cable connect the mapper decoder board to the main board of the MSX through this 50-pin back panel connector.
Only other 3 wires is soldered direct in the MSX main board and 2 ou 3 jumpers was cutted.
This decoder board is an article from the brazilian magazine MSX CPU and Ademir Carchano made some boards for brazilian comunity some years ago.
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