Hardware information
Software
MSX devices
See also the Books, Magazines and DIY page for do it yourself items. And the Technical information for computer-specific information.
Video computers mods |
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How to digitize in other screens like 5 and 7 |
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How to add a third slot to the VG82xx and the NMS8250/55/80.
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Solve cooling problems for the NMS8250/55/80 |
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Add MSX-DOS 2.x to the NSM8250/55/80 |
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Get real white color instead of grey on the NMS8280 |
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Another MSX 2+ mod |
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Cables |
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How to build RGB cable for japanese MSX computers and J-SCART devices. |
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Diagram of DIN- RGB Scart kabel |
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Joystick cable between 2 MSX computers: F1 Spirit 3D special/Joynet/Connect cable |
7 wires 1-6, 2-7, 3-8, 6-1, 7-2, 8-3, 9-9 |
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MCWF joystick cable (for their *slag games and Four on a Row) pin 6 for transferring 0, 7 for transferring 1 (master slave principle) |
3 wires 1 on 1: 6-6, 7-7, 9-9 |
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MSX 2(+) conversion |
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Convert to MSX2+ by replacing the V9938 with a V9958 and add the F4 register required by Basic 3.0 |
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Notes by JP Grobler on converting his NMS8250 to a MSX 2+:(with lots of help by Hans Oranje) I got the v9958 vdp and had the v9938 removed & replaced with a shrinked dip socket at a TV repair shop (2Euro) On the v9958 (connections were done on the chip itself!): Pins 1, 4, 27 GND Pins 21, 58 +5V Capacitor 100nF between pin 21 and pin 20 (Analog GND). I only had 27512 eproms and burned Basic 3 + Bios Sub roms into it. On the 8250: IC 119 = Main rom IC 118 = Subrom IC 117 = Diskrom I only replaced IC 119 & IC 118 IC 118 socket: Pin 1 (A15) is connected to +5V Pin 27 (A14) is connected to +5V Do not connect these pins of the eprom to the socket! Add wire between Pin 1 (A15) and the unused slot connector (MY) Pin 42 (5th from right) Add wire between Pin 27 (A14) and the unused slot connector (MY) Pin 41 (5th from right) IC 119 socket: Pin 1 (A15) is connected to +5V Do not connect these pins of the eprom to the socket! Add wire between Pin 1 (A15) and Pin 16 (GND) Add the F4 latch: see Hans Oranje instructions |
The source of these instructions is Hans Oranje! These ROMS are published here with permission from Hans Oranje. ROMS used by JP Grobler for MSX 2+ Basic 3.0 Hans Oranje not only adapted the MSX2+ ROMS to the
international standard as used in dutch MSX machines, he
also adapted for german MSX machines (for example
keyboard mapping). |
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Dutch article how to perform the MSX2+ conversion |
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The instructions to convert the SVI 738 to MSX-2 also in english, combined the CUC dutch (translated) info and the danish/finnish info |
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Convert Yamaha CX5M to MSX-2 |
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Dutch article: MSX 2+ ombouw: de hardware |
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Memory expansion and mappers |
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Jean Pierre Dubois' instructions how to expand the memory of the turboR ST and GT to 1Mb See also the other Jipe and Hans Oranje articles on the 30 pin memory DIMM usage. |
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Guillian's (Manuel Pazos) instructions on Panasonic A1-WSX memory upgrade (published by Dhau) to 512K |
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How to upgrade the memory on the Panasonic A1-WSX with a 1 MB DRAM 72 pins module, |
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512 kB RAM in the Panasonic FS-A1ST MSX turboR |
Required · 2x 44C256 RAM IC's · 2 SMD-capacitor 100 nF · 2 SMD-weerstand 100 Ohm · 1 resistor 10 kOhm Follow the next steps: |
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Addram: Manual and technical details about this 4 Mb memory mapper Note that this mapper has no back annotation so it will not work in most European MSX-2(+) machines. |
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Brazilian article how to build a megaram cartridge |
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Megaram Upgrade by Jipe Upgrade MegaRAM to 2Mb (Jipe aka as Jean-Pierre Dubois with the help of JP Grobler) Look at this circuit diagram (see
here) to upgrade megaram from 256K to 2MB |
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Megaram upgrade description by Hans Oranje |
Also Hans Oranje made a description on the Megaram upgrade for this circuit diagram |
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Upgrade of HB-G900AP to 1MB |
1. needed parts 4x 4bit 256kb chips (for example 514256) 2. open the case (upper part) 3. remove disk drive(s) 4. put chips to empty sockets 5. put all parts back that's all, since the 900AP standard has 512KB and is prepared for this upgrade |
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Hans Oranje (Hardware Partners Nederland and HCC MSX gg) is a very knowledgeble MSX hardware designer and still active with updates and products as the BERT and the slot expander. He has recently done memory upgrades of a Philips NMS8250 of Michel Meilink to 1MB using a 30 pins SIMM. Also a 2/4 MB upgrade to JP Grobler's NMS8250 was documented: the Hans Oranje made a detailed description how to perform these upgrade. Note that Hans Oranje advises to use the 1 MB SIMMS with 3 IC's and not the 9 chip types. If you only add 1 MB you can use the 9 chip type without problems. But for 2 MB the 9 chip variant puts a too heavy load on the buffer ICs (more ICs means more load!). |
Upgrades with PC SIMM |
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MSX 1MB memory mapper Ram Cartridge, design by M Fujimoto & MKT 1994/5 with static rams |
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The JIPE memory mapper to 4Mb using SIMMs by Jean-Pierre Dubois including print layout (with corrected errors 31 may 2002) |
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The 8250/55/80 memory mapper to 4Mb using SIMMs by Jipe (Jean-Pierre Dubois) for the 8250/55/80 |
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Diagram of memory mapper (in English from Brasil) |
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Memory mapper Original article (reviewed CPU-MSX no 34 and 35) R. Bridges Roberto Silva |
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256kB Expand memory MSX-2 NMS 8250/55/80 Twilight produkties |
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Panasonic MSX turboR A1 ST can be upgraded internally to 1Mb RAM |
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MCM 43 Memory mappers Verbeter een ontwerpfout in de 256/512K memory mappers |
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Extra geheugen in de Philips MSX-2 computers: van VG8235 tot NMS8280 |
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Digital KC geeft zijn kennis voort. Schema en achtergrond van de tot 4 MB grote megamapper |
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Wavy70FDD memory upgrade to 128K (japanese, the photo's explains the upgrade, only needed are RAM IC's, a capacitor and changing a jumper) |
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64K RAM extra in a NMS8220 |
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Slotexpanders |
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Eenvoudige slot extender, not a slot expander but just as handy and much cheaper and easier to build! Article by HansO |
Eenvoudige slot extender (dutch), Simple slot extender (english) |
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Circuit diagram of simple (internal) slot expander (note the missing BUSDIR, see the PTC article!), see also the magazine section MCCM and PTC for other slot expanders, Leonard Silva de Oliveira (simplified version on ASCII design at MSX Datapack) |
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MCCM 70 Digital KC geeft zijn kennis voort. Schema en achtergrond van de slotexpander |
De
slotexpander:
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MSX Club Magazine 37, 38 Slotexpander eerst begrijpen en dan bouwen Theorie, schema en aanwijzingen voor een MSX slotexpander |
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PTC Print 36 Schema's van een slotexpander met correcties twee jaar later |
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Mini mapper for memory expansion |
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6/7 MHz clock upgrades and repairs |
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Repair for a MSX with broken clockoutput by Carlo Escobar. Often the CPUCLK output from the v9938 becomes damaged (for example by instering cartidges with power switched on. |
Here is a solution to obtain an alternative CPUCLK. |
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6 MHZ opvoeren van Spectravideo en MSX 1,2 computers Vrij veel toegepaste klokverhoging schakeling. Na veel updates universeel toepasbaar gebleken |
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MCCM 86 Voer turboR op naar 40mhz |
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MSX Club Magazine 31 Turbo 7 MHz voor MSX Bouwbeschrijving voor klokversnelling naar 7 MHz met correcties |
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Superturbo, another 7 MHz upgrade designed by Alwin Henseler |
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Turbo 7 MHz kit instructions how to build in. (MSX CLub Gouda, Digital KC, MK Public Domain etc) |
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Sound projects |
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Toshiba HX-MU900 upgrades by FRS |
Three upgrades where done on the HX-MU900: 1) 256KB SampleRAM 2) MSX-Audio BIOS 3) Audio input (for recording) The first two are complete and work perfectly. The 3rd upgrade, the audio-input, do not work as well as it should. The HX-MU900 indeed record samples, but there is some problem on the analog portion of this upgrade that is beyond my skills: it records quite some background noise on the samples. I only have digital-electronics knowledge, thats why I can't figure whats wrong. I've included the unfinished 3rd upgrade in the guide in hope that someone with analog electronics skill could help to solve this background noise nuisance. |
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See also Updated pseudo stereo circuit in CUC magazine |
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Description to build 256kB Sampleram into Philips NMS1205 MSX-Audio Jon de Schrijder, 1998 |
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PSG
stereo mixer by Ivan Isidro |
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Convert Muziek module to MSX Audio From Xelasoft SME-3 userguide |
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MSX Magazine, Disk-FAN 4/5 |
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See also the hardware section for sound fixes to various computers |
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MSX-DOS 2 |
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MSX-DOS inside |
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Alternative MSX-DOS 2 circuits Correction
by Emil Sokolowski: In de uitleg van Bas Kornalijnslijper
zit een foutje, of eigenlijk er ontbreekt nog een regel. Het
gaat om de volgende PDF: |
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External MSX-DOS 2 cartridge as designed by Peter Overbeek, rom contents for MSX-DOS 2.2 en 2.23 |
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Other |
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MSX cassette system: connecting two MSX computers via the cassette interface, use a PC as cassette recorder with high speed, programs and links. A side effect of my current projects with standalone MSX computers with all kind of i/o. |
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BEER IDE 202 interface How to make
a IDE HDD drive interface for MSX Partitioning program by Adriano daCunha Two more remarks: |
hddrom.mac - ROM source (diskrom) hddide.gif - Schematic BEER 202 sources of ROM and (untested) HD partitioning program Partitioning program by Adriano Pictures by DaBest of a build interface: From Luiz Leo: PCB-design for BEER IDE, by Arnold Metselaar! Eagle format and postscript, design is not tested, use at your own risk |
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Build yourself a MSX Mouse adapter: PS/2 mouse to FMTowns/MSX interface by Anikun. |
Build the ps2 to fm-towns mouse interface. JP Grobler did that and it works on his MSX in Meridian 3 and "windows 2000"- msx version. Replace the MA723 diodes with 1N4148 . You can use a 16F84A/20p Add a reset button to the PIC - the original documentation mentions the mouse pointer becoming unstable? this should solve the problem. Cost : PIC 3.5E , rest 1E, 1 hour of soldering, cutting etc. |
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Build a switch in a Konami SCC cartridge to use it as a music cartridge or as the original game |
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Extra floppy disk for Sony HB-F700P/D and Philips computers |
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Connect electronic typewriter to MSX German article to build a serial interface for a printer |
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RS-232C
interface for NMS1250 and Telcom modems"
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Connect MSX RGB to VGA monitor Design notes by JP Grobler |
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Change NMS1205 modem I/O adress Mari van der Broek |
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Convert a PC mouse to a standard MSX mouse: Re Mouse and Nice Mouse The Bytewizards: Victor van Acht, his brother and Albert Huitsing build a device to convert a PC mouse (serial) to a standard MSX. The device was sold in the Netherlands as Remouse and repackaged as Nice Mouse available from Mirisoft in Italy. |
Here you will find the circuit diagram and PCB layout, the assembler source (dutch documents) of the programmable Atmel controller used in this project and a text file describing the mouse protocols used.
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MMC floppy drive and SCC flash cartridge |
Build a floppy drive on a MMC memory card and a flashram SCC cartridge by Yeongman Seo |
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IC Miri designs of: |
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Upgrade VRAM in your your MSX2+/TurboR to 192KBytes |
