Konami Sound Cartridge

Konami Sound Cartridge

The Konami Sound Cartridge is supplied with the MSX
video games "Snatcher" and "Super Deform Snatcher". Sometimesit is known as the SCC+. It includes a slightly improved SCC sound chip and 64kB of volatile RAM. It is likely that the RAM was included since most MSX computers in Japan at the time of release had very little memory (mostly64kB).

Like the normal SCC, the chip has 5 audio channels. The waveform is set by 32 bytes of 8 bit samples. Each channel has its own 32 bytes of waveform, unlike the SCC where channel 4 and 5 share thewaveform.

The cartridge included with Snatcher is different than the one includedwith Super Deform Snatcher, but only in memory layout. It was probablydone to make it incompatible. Some MSX emulators emulate this cartridge,
MESS for example.

Most video games on the Konami Games Collections for theMSX can use the cartridge that is included with Snatcher for better sound. Apart from those the Sound Cartridge is not used by any other programs.

The print on the chip is: "KONAMI 052539 SCC-I2312P001 JAPAN" followed bya fabrication location/date number, like 8951EAI. The first two digits are the year, followed by the week. The letters after that are some location/lot code.

Expanding memory

It is possible to expand the memory to 128kB by adding 64kB of RAM to the cartridge. There are two open places on the PCB. When the RAM is added, bothtypes of cartridges become identical. The cartridge will work withboth "Super Deform Snatcher" and "Snatcher" video games.

Surprisingly enough, a cartridge with 128kB RAM can behave exactly likea SCC RROM cartridge of 128kB. This means you can loadthose games into the RAM (eg. "Gradius 2", "F1 Spirit", "Quarth" and so on) and it will behave like the original ROM cartridge until the power is turned off, since it is volatile RAM. It is possiblethat this chip was originally developed for internal development andtesting use at Konami.

The RAM ICs are of type 4464. They are four bits wide and a 64K range. Theremight still some solder in the holes, you can use a solder sucker for that.

If you would like the cartridge to work with both video gamesthen you can also connect the memory banks (so they are mirrored). ConnectCAS (pin 16 of RAM IC) of one of the RAM ICs with one of the empty slots.

Using the memory

Everything is done using memory-mapped I/O and it is much like the
SCC ROM cartridges.

As with SCC cartridges, the memory is divided into fourmemory banks of 8kB:

; Bank 1 : 4000h - 5FFFh; Bank 2 : 6000h - 7FFFh; Bank 3 : 8000h - 9FFFh; Bank 4 : A000h - BFFFh

To change the mapping, write to one of these addresses:

; Bank 1 : 5000h - 57FFh; Bank 2 : 7000h - 77FFh; Bank 3 : 9000h - 97FFh; Bank 4 : B000h - B7FFh

Bits 3 through 7 are ignored. Values 0 to 7 select 8kB pages of the lower64kB (which is included with "Snatcher") and values 8 to 15 the higher64kB (which is included with "Super Deform Snatcher").

By default (after reset) bank 1 selected area 0, bank 2 area 1, bank 3 area2 and bank 4 area 3. Again this is the same as SCC ROMcartridges. If the lower 64kB is empty (as it is with the Super Deform Snatcher cartridge) then the memory will be empty (reads FFh).

By default, the RAM cannot be changed. By setting a bit somewhere elsethe areas can no longer be changed (ROM mode) but can be written to (RAM mode). This is done by writing to the "mode register", which is alwaysaccessible through address BFFEh and BFFFh. The SCC can be put in also be put in SCC+ mode through this register, where channel 4 and 5 do not share a waveform.

; bit 7 : no function; bit 6 : no function; bit 5 : if set, sound chip is in SCC+ mode otherwise SCC compatibility; bit 4 : if set, banks 1 to 3 are in RAM mode otherwise area select; bit 3 : no function; bit 2 : if set and bit 5 reset, bank 3 is RAM mode irrespective of bit 4; bit 1 : if set, bank 2 is RAM mode irrespective of bit 4; bit 0 : if set, bank 1 is RAM mode irrespective of bit 4

Even in RAM mode the memory under BFFEh and BFFFh cannot be changed throughthose addresses as that will always end up in the mode register.

Konami uses 20h and 3Fh for the mode register as they always use SCC+mode. 30h would also work for RAM mode.

Using the sound chip

If bank 3 is in area select mode and bit 5 of mode register is reset, the SCC can be activated by writing 3Fh to one address 9000h through 97FFh. Thelayout is very similar to the SCC and the meaning ofthe registers is the same although the address differ somewhat and the waveform of channel 5 can be read. The SCC is visible at 9800h through 9FDFh.

Addressread/writeFunction
9800h - 981Fhrwwaveform channel 1
9820h - 983Fhrwwaveform channel 2
9840h - 985Fhrwwaveform channel 3
9860h - 987Fhrwread: waveform channel 4 write: waveform channel 4 and 5
9880h - 9881hwfrequency channel 1
9882h - 9883hwfrequency channel 2
9884h - 9885hwfrequency channel 3
9886h - 9887hwfrequency channel 4
9888h - 9889hwfrequency channel 5
988Ahwvolume channel 1
988Bhwvolume channel 2
988Chwvolume channel 3
988Dhwvolume channel 4
988Ehwvolume channel 5
988Fhwon/off switch channel 1 to 5
9890h - 989Fhwsame as 9880h to 988Fh
98A0h - 98BFhwwaveform channel 5
98C0h - 98DFhrwdeformation register
98E0h - 98FFhno function

If bank 4 is in area select mode and bit 5 of the mode register is set,the SCC+ can be activated by writing a value with bit 7 set to anywhereto B000h through B7FFh. Now the SCC+ becomes active at B800h throughBFDFh.

Addressread/writeFunction
B800h - B81Fhrwwaveform channel 1
B820h - B83Fhrwwaveform channel 2
B840h - B85Fhrwwaveform channel 3
B860h - B87Fhrwwaveform channel 4
B880h - B89Fhrwwaveform channel 5
B8A0h - B8A1hwfrequency channel 1
B8A2h - B8A3hwfrequency channel 2
B8A4h - B8A5hwfrequency channel 3
B8A6h - B8A7hwfrequency channel 4
B8A8h - B8A9hwfrequency channel 5
B8AAhwvolume channel 1
B8ABhwvolume channel 2
B8AChwvolume channel 3
B8ADhwvolume channel 4
B8AEhwvolume channel 5
B8AFhwon/off switch channel 1 to 5
B8B0h - B8BFhwsame as B8A0h to B8AFh
B8C0h - B8DFhrwdeformation register
B8E0h - B8FFhno function

Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Konami Sound Cartridge — Микросхема Konami SCC I, год выпуска 1988 Konami Sound Cartridge  специальный картридж расширения для бытовых компьютеров стандарта MSX, поставлявшийся в комплекте с играми Snatcher и Super …   Википедия

  • Konami SCC — Микросхема Konami SCC, год выпуска 1988 The Konami SCC (Sound Custom Chip или Sound Creative Chip)  электронный компонент, микросхема звукогенератора, разработанная фирмой Konami совместно с Yamaha для использования в бытовых компьют …   Википедия

  • Konami SCC — The Konami SCC (Sound Custom Chip or Sound Creative Chip) is a sound chip developed by Konami with Yamaha for the MSX. Konami was dissatisfied with the capabilities of the PSG, the MSX and MSX2 built in sound chip. The SCC is used together with… …   Wikipedia

  • NES Sound Format — NSF is the DOS 8.3 filename Filename extension of the audio file format originally designated as NESM (Nintendo Entertainment System Music) by the inventor Kevin Horton. This format was originally designed for playback in a custom hardware device …   Wikipedia

  • One Chip MSX — Версия стандарта MSX2 Производитель D4 Enterprise …   Википедия

  • Snatcher — Desarrolladora(s) Konami Distribuidora(s) Konami Diseñador(es) Hideo Kojima Plataforma(s) …   Wikipedia Español

  • Zemmix — Zemmix  торговая марка Южнокорейского производителя электроники Daewoo Electronics Co., Ltd.. Под маркой Zemmix в период с 1984 по 1995 годы была выпущена серия игровых консолей, совместимых со стандартом MSX. Консоли этой серии никогда …   Википедия

  • Snatcher — Infobox VG| title = Snatcher caption = Cover artwork of the original PC 8801 version. developer = Konami publisher = Konami designer = Hideo Kojima engine = released = NEC PC 8801: vgrelease|Japan|JP|November 26 1988 MSX2:… …   Wikipedia

  • SD Snatcher — Infobox VG| title = SD Snatcher developer = Konami publisher = Konami designer = Hideo Kojima engine = released = April 27, 1990 (JP) genre = RPG modes = Single player platforms = MSX2 media = 3½ inch DD floppy disk x 3 (MSX)+ Cartidge… …   Wikipedia

  • SG-1000 — Sega SG 1000 Manufacturer Sega …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”