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공지사항

MSX1 run 3.58Mhz and I've tried higher speed in my previous prototype board failed.

Due to lack of environments of signal and some others..


Now, I have a proper PCB with signal and can handle more for my purpose.

APMSX card have 512KB Fast SRAM and it is fast enough.

So, I've tried it to run 7.16Mhz and checked the status..

No, it doesn't work properly.. Screen have some broken sprites..

Maybe VDP can't follow the I/O Speed.


So, added internal turbo OFF function while accessing IO.

When I/O access happen, It added some delays then it works properly..


Tested simple speed testing program.

It takes 86 ticks on normal speed MSX but, now it just took 42 ticks.


Also faster scrolling be obtained.

Tested on GAME.

The BOSCONIAN have starting voice as 'BLAST OFF'.

Now on turbo mode, this pitch become higher..

So, it runs on faster CPU mode.


This is TWINBEE.

It runs really fast.. 



APMSX can have 3 running mode.


1. APPLE II / MSX isolated mode (Run each system at the same time)

2. APPLE II * MSX hybrid mode (Run each system at the same time)

3. Switching mode between above. but not run at the same time.

This turbo mode only work isolated mode 1 and 3(need test).


Anyway, APMSX card also can use as a Softcard for CP/M and attached devices as the same MSX. I/O address.



Thanks

Ian Kim


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Posted by 이안김

Hi friend,


I'm working on it.

Firmware task is on going..

Around 80% done and working now as the MSX computer on APPLE II.


It is installed as below


Used 3.5mm phone connector for Audio & Video output.

And applied Auto Switching..

Used PS2 keyboard signal for MSX keyboard.


This is simple joypad. It is fot the VDP option board and needed little modify to fit on APMSX.

Watch this how does it work.


It is almost the same as the prototype board.


APMSX board working as below.





Thanks

Ian Kim

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Posted by 이안김

New PCB arrived.

This board optimized using the VRAM and CPLD for less space.

And added sound chip.


Video automatic switcher applied.

Joystick support for the SG-1000 and the Colecovision.

Mode selection Switch SG-1000 /COLECOVISION

Unfortunately I did some mistake and fixed as below.





The Z80 board connector relocated to right side hence it would be as below.



CP/M Turbo7 Z80 card doesn't soldering a connector so, user can solder for their purpose.


In this case, I soldered pin connector male and female for joint.

But, after connect it both, it consume another slot space and may interfere.

Even move the connector to Right on VDP board.

It still consume some space but, some of small card may be usable.


I hoped the VDP option board in slot7 cause there is no other socket on right side so free of space.

If really don't like this combine, maybe can use short IDE40ping cable could be used.


Here are some more running game on COLECOVISION mode.










Here is a Joypad for game play or input device.



This VDP&Sound option board will work under CP/M hence,

It can be also used to make game or other program under CP/M.

Hope to make good fun software under Turbo pascal or Z80 ASM.



New Option board would be prepared some weeks later.

If you have any concerns, please let me know (quick09@gmail.com) .


Thanks a lot

Ian Kim

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Posted by 이안김

Added some photos. 

Of course it has sound too.

Hope you like it. :)




































I'm waiting for updated PCB.

New board included for TMS9918 , Sound chip and Joypad port.

So, I can play games. 


As you know, this is not emulator. 

It is real VDP board with sound chip.


Also It works under the CP/M 80.

So, You can even make a game under the CP/M.

I want make some game with this option board.


Thanks;

Ian Kim


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Posted by 이안김

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