이안은 뭐하니?

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

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

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

Added some photos. 

Of course it has sound too.

Hope you like it. :)

Dear friends,

This is final testing board of the 512K RAM card for APPLE II series,

It is fully compatible  Saturn 128K RAM card and even 512KB it have with battery backup so, all data isn't volatile.

And it has integrated No Slot Clock real time clock for APPLE II.

You can use replace old 16KB memory card.

Also You can use it as 4 RAM DISKs with battery backup.

For APPLE ][ / ][+

; If you install it on SLOT#0, You can at least use it as you have +16KB memory card but it is saturn 128KB.

No Slot Clock doesn't work if you put it on SLOT#0.

No Slot Clock emulation need a slot signal and the slot#0 doen'st have it.

But, If you want modify it it is possible.. Please ask me anyway you need a dummy card..

For APPLE //e

You can use it as you have a Saturn 128KB and Real time clock(No Slot Clock ).

* Memory capacity is 4 times 128KB of Saturn hence you can switch present bank with one POKE command.

WIth this command, you can have 4 RAM non volatile DISK with internal battery backup and external battery also provide.

Too complicated?, just use it as the Saturn 128K RAM card and the real time clock 

Thank you

Ian kim

I have hard time to make it work as the COLECOIVISON game console.

After several tries with hard learning of structure.

I could run it but, some game only.I don't know the reason why it can't play the other ROM.

First, It shows start screen by ROM BIOS.

And tested with ROM data. 

I can find upte 32KB sized ROM data but, This board ccould support up to 24KB not 32KB due to APPLE II structure.

This board also works with the privous SG-1000 joypad but not the same. Anyway internally will change this convertion to play properly.

I remember this game. 

It is very old game.. maybe when I was 11 years old, I did play it but, not good player .

In that time I didn't know what does carnival means.

It looks he is using his invented wheel. :)

It's CongoBongo..

Time pilot.. It is some similar as the arcade game..Anyway It's fun to me.

Oh my poor frog..

Maybe from that time, we have to consider to build alternate ways to avoid  the road kill.

And I'm trying to run other games but, still no idea what is the problem.

It looks memory fault or NMI fail. Anyway there is no ROM.. it means, it could be overwriten by code..

It having some hard to understand the structure of COLECOVISION...

Anyway, This VDP board isn't purpose for GAME emulator.

I'm want to show what this VDP board could do. but, It is a board for GAME play too.

Please don't forget it is a daughter board of the CP/M card. :)

And enjoy some game when you are tired while you are making your own program.

Thanks

Ian Kim