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Detecting memory size in YIS805

By Kir

Supporter (9)

Аватар пользователя Kir

21-02-2007, 01:23

День добрый. Расскажите уже все забывшему мне, как определить объем памяти.
Купил я YIS805 и, естественно, попробовал Metal Gear запустить. Но ждал меня облом, как и со всеми остальными играми. Порывшись я обнаружил, что testram и loadrom сообщают о наличии всего 64 Кб в слоте 3,2. Из бэйсика тоже самое -- я перебираю страницы, и их всего 4. Тем не менее, на заставке написано 128 Кб. Есть ли тут какой-то подвох, или просто память битая?

Кирилл

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By dvik

Prophet (2200)

Аватар пользователя dvik

21-02-2007, 01:41

Please post in the Russian forum. (I'm not sure how do to this though since I failed to do it).

By Shiru

Expert (115)

Аватар пользователя Shiru

21-02-2007, 05:40

Short translation, if anybody interested:

Good day. Please, tell me, how to detect memory size. I bought Yamaha YIS805, and tried to run Metal Gear. But game not work, as well as other games, which I tried. I see that testram and loadrom detect only 64 KB in slot 3.2. In BASIC going same thing - I check pages, and there is only 4 pages. Although, on start-up screen 128 KB are displayed. Is there some thing, which I don't know, or memory just broken?

Kirill

By NYYRIKKI

Enlighted (5918)

Аватар пользователя NYYRIKKI

21-02-2007, 07:47

I don't speak russian, so I'll try to answer more international way:

128KB = VRAM = VIDEO, VDP
64KB = RAM = CPU

128KB + 64KB + mgear.rom = :-(
128KB + 64KB + Metall Gear CARTRIDGE ( [__] ) = :-)

By Manuel

Ascended (18788)

Аватар пользователя Manuel

21-02-2007, 09:43

The YIS-805/128 has an 128kB memory mapper, though.

By cax

Prophet (3737)

Аватар пользователя cax

21-02-2007, 10:27


128KB + 64KB + Metall Gear CARTRIDGE ( [__] ) = :-)

There is no such thing as "available MSX cartridges" in ex-USSR, as they never were sold anywhere on that territory.

By dhau

Paragon (1570)

Аватар пользователя dhau

01-03-2007, 08:02

SFMSX provided info how to easily upgrade stock YIS-805/128 to 256K RAM. The places for 4 x 4464 chips and corresponding capacitors is already on PCB. All you have to do is change position of J305 jumper on PCB (some soldering required). I may try it at some point.

By Asmx

Supporter (2)

Аватар пользователя Asmx

21-03-2007, 18:16

There were actually two jumpers. I don't remember ids of the jumpers by heart, but one of these was J305 probably, yes ... some of these days I have to re-check it from inside of my MSX.