RAM chip: Difference between revisions
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NeoGeo use multiples SRAM (Static RAM) types: | NeoGeo use multiples SRAM (Static RAM) types: | ||
* Work, Backup and lower Video RAM chips are 256k SRAM (5 volt, JEDEC pin compatible, 32K x 8bit) and only differ by speed. They have "256" or "257" in their markings | * Work, Backup and lower Video RAM chips are 256k SRAM (5 volt, JEDEC pin compatible, 32K x 8bit) and only differ by speed. They have "256" or "257" in their markings | ||
* | * Fast Video RAM (VRAM $8000~$87FF) chips are embedded into a Neo-GRC chip or 16k SRAM (5 volt, 24pin DIP, 2K x 8bit, 35ns or faster), however some [[MVS hardware|MVS]] and [[AES hardware|AES]] allow the use of a 28pin SRAM by the use of a jumper. | ||
* Sound RAM chips are 16k SRAM (5 volt, 24pin DIP, 2K x 8bit, 150ns or faster) - fast Video RAM chip can be used as a replacement as they are faster (35ns). | * Sound RAM chips are 16k SRAM (5 volt, 24pin DIP, 2K x 8bit, 150ns or faster) - fast Video RAM chip can be used as a replacement as they are faster (35ns). | ||
* Palette RAM chips are 64k SRAM (5 volt, JEDEC pin compatible, 8K x 8bit, 120ns or faster) | * Palette RAM chips are 64k SRAM (5 volt, JEDEC pin compatible, 8K x 8bit, 120ns or faster) | ||
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File:CXK5814P-35L.jpg|Sony CXK5814P 35ns<br />fast Video RAM | File:CXK5814P-35L.jpg|Sony CXK5814P 35ns<br />fast Video RAM | ||
File:BR6216B-10LL.jpg|BR6216B 100ns<br />Sound RAM | File:BR6216B-10LL.jpg|BR6216B 100ns<br />Sound RAM | ||
File:BR6265BF-10SL.jpg|BR6265BF 100ns<br /> | File:BR6265BF-10SL.jpg|BR6265BF 100ns<br />Palette RAM | ||
File:BR6216A-15L.jpg|BR6216A 150ns<br />Sound RAM | File:BR6216A-15L.jpg|BR6216A 150ns<br />Sound RAM | ||
</gallery> | </gallery> | ||
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* any "43256", "62256", CXK58257 | * any "43256", "62256", CXK58257 | ||
=== | ===Fast Video=== | ||
* CXK5814P-35L | * CXK5814P-35L | ||
* CXK5863P-35L (only on boards that allow the use by changing the jumper) | |||
* any CXK5814, CYC128A, 6116 | * any CXK5814, CYC128A, 6116 | ||
| Line 39: | Line 40: | ||
* XLJ6265AF-10SL | * XLJ6265AF-10SL | ||
* BR6265BF-10SL | * BR6265BF-10SL | ||
* "6164" for generic device test | |||
===Sound=== | ===Sound=== | ||
| Line 136: | Line 138: | ||
===MV-6=== | ===MV-6=== | ||
* Work: H9 & J9 | * Work: H9 (lower) & J9 (upper) | ||
* Backup: E9 & F9 | * Backup: E9 (upper) & F9 (lower) | ||
* Video: L9 & K9 | * Video: L9 & K9 | ||
* fast Video: CXK5814P-35L, M11 & N11 | * fast Video: CXK5814P-35L, M11 & N11 | ||
Latest revision as of 11:38, 27 April 2022
MVS RAM chips often fry due to overvoltage from a badly adjusted or failing cab power supply. It appears that the most common failure mode is the inability to write new data, resulting in errors during system self-test at the beginning of address ranges.
NeoGeo use multiples SRAM (Static RAM) types:
- Work, Backup and lower Video RAM chips are 256k SRAM (5 volt, JEDEC pin compatible, 32K x 8bit) and only differ by speed. They have "256" or "257" in their markings
- Fast Video RAM (VRAM $8000~$87FF) chips are embedded into a Neo-GRC chip or 16k SRAM (5 volt, 24pin DIP, 2K x 8bit, 35ns or faster), however some MVS and AES allow the use of a 28pin SRAM by the use of a jumper.
- Sound RAM chips are 16k SRAM (5 volt, 24pin DIP, 2K x 8bit, 150ns or faster) - fast Video RAM chip can be used as a replacement as they are faster (35ns).
- Palette RAM chips are 64k SRAM (5 volt, JEDEC pin compatible, 8K x 8bit, 120ns or faster)
See memory speed for details about speed grades.
Pictures
-
Sony CXK58256 120ns
Work, Backup and Video RAM -
Sony CXK5864BSP 100ns
Palette RAM -
Sony CXK5814P 35ns
fast Video RAM -
BR6216B 100ns
Sound RAM -
BR6265BF 100ns
Palette RAM -
BR6216A 150ns
Sound RAM
Pinout and cross-refence
Work, Backup, Video
- CXK58256MM-12
- KM62256CLG-7
- W24258S-70LE
- CXK58257AM-12LX
- any "43256", "62256", CXK58257
Fast Video
- CXK5814P-35L
- CXK5863P-35L (only on boards that allow the use by changing the jumper)
- any CXK5814, CYC128A, 6116
Palette
- CXK5864BSP-10L
- LH5168N-80L
- XLJ6265AF-10SL
- BR6265BF-10SL
- "6164" for generic device test
Sound
- BR6116-100
- BR6216B-10LL
- BR6216A-10LL
- any CXK5814, CYC128A, 6116
Replacement
For Work, Backup and Video RAM look for 256kbit SRAM, 5 volt, JEDEC pin compatible, 32K x 8bit, 120ns or faster in 28 pin SOIC package (not SOJ). Cypress, ISSI, UMC and Lyontek still make them and most today are 45ns, so any will do. This includes 62256, 43256, cxk58257, and others.
For fast Video RAM look for 16kbit SRAM, 5 volt, JEDEC pin compatible, 2K x 8bit, 35ns or faster in 24pin DIP package.
For Sound RAM look for 16kbit SRAM, 5 volt, JEDEC pin compatible, 2K x 8bit, 150ns or faster in 24pin DIP package.
This includes the CXK5814, CYC128A, and 6116 ICs, provided they are fast enough.
For Palette RAM chips
The can be replaced by 64k RAM chips off of old 386/486 motherboards (fast cache).
This includes the CXK5864BSP-10L 28 pin DIP and LH5168N-80L 28 pin SOIC
Chips types and locations
MV-1
- Work: CXK58256MM-12, G3 & H3
- Backup: CXK58256MM-12, H5 & H6
- Video: CXK58256MM-12, G4 & H4
- fast Video: CXK5814P-35L, C5 & D5
- Palette: CXK5864BSP-10L, H9 & H10
- Sound: BR6116-100, H1
MV-1A
- Work: KM62256CLG-7, RAM1 & RAM2
- Backup: KM62256CLG-7, RAM3 & RAM4
- Video: KM62256CLG-7, RAM5 & RAM6
- fast Video: none
- Palette: LH5168N-80L, BR6265BF-10SL, RAM7 & RAM8
- Sound: BR6216B-10LL, RAM9
MV-1B
- Work: KM62256CLG-7, RAM1 & RAM2
- Backup: KM62256CLG-7, RAM3 & RAM4
- Video: KM62256CLG-7, RAM5 & RAM6
- fast Video: none
- Palette: none
- Sound: BR6216B-10LL, RAM7
MV-1C
- Work: W24258S-70LE, RAM1 & RAM3
- Backup: W24258S-70LE, RAM2 & RAM4
- Video: W24258S-70LE, RAM5 & RAM6
- fast Video: none
- Palette: none
- Sound: none
MV1FS
- Work: CXK58257AM-12LX, H4 & H5
- Backup: CXK58257AM-12LX, H6 & H7
- Video: CXK58257AM-12LX, B4 & B5
- fast Video: CXK5814P-35L, C6 & D6
- Palette: CXK5864BSP-10, H8 & H8
- Sound: BR6116-10, K3
MV1FZ & MV1FZS
- Work: KM62256CLG-7, RAM1 & RAM2
- Backup: KM62256CLG-7, RAM3 & RAM4
- Video: KM62256CLG-7, RAM5 & RAM6
- fast Video: CXK5814P-35L, RAM7 &RAM8
- Palette: XLJ6265AF-10SL, RAM9 & RAM10
- Sound: BR6216B-10LL, RAM11
MV2FS
- Work: LH52B256N-70LL, D3 & D4
- Backup: LH52B256N-70LL, G1 & G2
- Video: LH52B256N-70LL, C7 & C8
- fast Video: CXK5814P-35L, C9 & D9
- Palette: CXK5864BSP-10L, B8 & B8
- Sound: BR6216B-10LL, K11
MV2-01
- Work: LH52B256N-70LL, E5 & E6
- Backup: LH52B256N-70LL, H3 & H4
- Video: LH52B256N-70LL, F13 & G13
- fast Video: CXK5814P-35L, F12 & G12
- Palette: CXK5864BSP-10L, B9 & C9
- Sound: BR6216B-10LL, BR6216A-10LL, K13
MV-4F
- Work: CXK58256MM-12L, G9 & H9
- Backup: CXK58256MM-12L, D9 & E9
- Video: CXK58256MM-12L, K9 & L9
- fast Video: CXK5814P-35L, L11 & M11
- Palette: CXK5864BSP-10L, F4 & H4
- Sound: BR6216B-10LL, L1
MV-6
- Work: H9 (lower) & J9 (upper)
- Backup: E9 (upper) & F9 (lower)
- Video: L9 & K9
- fast Video: CXK5814P-35L, M11 & N11
- Palette: CXK5864BSP-10L, G4 & H4
- Sound: BR6116-100, M1