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| How much memory a MSX 2+ would have?
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Yukio
msx professional
Berichten: 777 |  Geplaatst: 17 Januari 2006, 02:35 |
Do you know how much memory a original system would have?
This without count external or internal expansions!  |
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Sonic_aka_T
msx guru
Berichten: 2261 | Geplaatst: 17 Januari 2006, 02:47 |
As far as I know they all have 64kB RAM. Well, at least the models I've seen.
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BiFi
msx guru
Berichten: 3142 | Geplaatst: 17 Januari 2006, 07:10 |
Original MSX2+ computers are Japanese only and have 64 KB of RAM. The MSX2 computers which are modified to MSX2+ most likely have more (128+ KB RAM).
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tfh
msx addict
Berichten: 492 | Geplaatst: 17 Januari 2006, 10:57 |
Most Japanese based systems for MSX2 and 2+ only had 64kb of RAM.
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Yukio
msx professional
Berichten: 777 | Geplaatst: 17 Januari 2006, 20:44 |
Quote:
| Original MSX2+ computers are Japanese only and have 64 KB of RAM. The MSX2 computers which are modified to MSX2+ most likely have more (128+ KB RAM).
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Yes, I was thinking about it ...
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Yukio
msx professional
Berichten: 777 | Geplaatst: 17 Januari 2006, 20:46 |
And the Memory Mapper?
External cartridges with and without MSX-DOS2?
There is a 256KB Mapper cartridge with MSX-DOS2 and a 768KB memory expansion from ASCII .
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Niles
msx professional
Berichten: 519 | Geplaatst: 18 Januari 2006, 09:09 |
In other thread (at spanish section) I'm being warn that some kind of MSX2+ from Panasonic (as the FS-AWSX1) and turboMSXs have an internal memory mapper that puts the RAM of the external cartridge BEHIND the main memory of the machine.
It means, in those machines you'll have the 64 Kb and later, only if the software is prepared to scan the slots, you'll have the 256, 512 or whathever external KB...
damn...
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msd
msx professional
Berichten: 607 | Geplaatst: 18 Januari 2006, 18:55 |
There is a tool for changing that
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Niles
msx professional
Berichten: 519 | Geplaatst: 18 Januari 2006, 20:04 |
Really? which one, please...
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msxrestarter
msx freak
Berichten: 179 | Geplaatst: 18 Januari 2006, 21:08 |
MEMTR is the tool you need. 
It makes the turboR choose the biggest memory mapper.
If you use an external mapper which is bigger than the internal, this program will choose the external mapper.
But,.... I have problems using it with my 1MB external mapper (Digital KC) on my standard A1-ST with 256kb internal mapper.
When I run memtr the computer 'hangs' after choosing the external mapper. 
Don't know what's the problem, but maybe this external mapper isn't supported. |
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Niles
msx professional
Berichten: 519 | Geplaatst: 18 Januari 2006, 23:49 |
I'll look for this tool and test it... thanks a lot for the info  |
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[D-Tail]
msx guru
Berichten: 2991 | Geplaatst: 19 Januari 2006, 06:54 |
External memory is - for some reason - a lot slower on the turboR than the internal mapper. That's why turboR by default selects the internal mapper as primary. Your memory just may be too slow for the turboR to handle, although I'm not sure... Not a DOS/mem/ASM expert, you know ^_^
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BiFi
msx guru
Berichten: 3142 | Geplaatst: 19 Januari 2006, 06:59 |
My guess is the internal DRAM chips being directly connected to the R800 CPU is the reason which makes it faster.
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dhau
msx master
Berichten: 1047 | Geplaatst: 19 Januari 2006, 15:00 |
Wasnt all the reads and writes to external memory mapper padded with WAIT signal on the bus?
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msd
msx professional
Berichten: 607 | Geplaatst: 19 Januari 2006, 15:24 |
The cartrige ports on the turbo r run on 3.54Mhz. The internal ram of the turbo r runs on a higer speed (probably 7.16Mhz)
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