TnCart hangs when turbo mode of Panasonic 2+ machines is turned on

[polileco]

Some titles, especially games, when activated turbo mode, causes the machine to hang. Ghosts'n'Goblins, Life on Earth and Chibi Akumas are some examples.

[buppu3]

Since tnCart is designed assuming a bus clock of 3.58 MHz, it will not work in the high-speed mode of Panasonic machines.
The SDRAM memory bandwidth is time-divided between the Z80 side and the VDP side, so if the memory timing on the Z80 side is too fast, it will not be able to keep up.
To avoid hang-up, it is necessary to drive the WAIT signal to suppress the Z80 operation.

[Msxinfo]

Hi Buppu, can you make a solution for the tnCart firmware to work on turboR? It seems to work on the original WonderTang firmware? Is it possible to use that solution on your tnCart firmware as well?

[buppu3]

What are the specific problems with using turboR?

[Msxinfo]

What are the specific problems with using turboR?

Just tested it on a MSX turboR. The turboR starts, but after mentioning the SD card driver the screen freezes and two japanese characters appear on the left upper screen. Sorry, did not make a screenshot.

I tried starting it up in Z80 mode (by pressing 1), but the WT is not recognized and a ''call system' does not go to nextor.
The original WT 2.0b firmware works with turboR. I did not test on 1.02d, but I expect it to work as well. Luis Antoniosi made an adjustment in the firmware. Perhaps you can have a look at the files on his github to see what his solution is?

See Antoniosi's youtube video: https://www.youtube.com/watch?v=VxTeO_pEJkw

[buppu3]

What are the specific problems with using turboR?

Just tested it on a MSX turboR. The turboR starts, but after mentioning the SD card driver the screen freezes and two japanese characters appear on the left upper screen. Sorry, did not make a screenshot.

I tried starting it up in Z80 mode (by pressing 1), but the WT is not recognized and a ''call system' does not go to nextor. The original WT 2.0b firmware works with turboR. I did not test on 1.02d, but I expect it to work as well. Luis Antoniosi made an adjustment in the firmware. Perhaps you can have a look at the files on his github to see what his solution is?

See Antoniosi's youtube video: https://www.youtube.com/watch?v=VxTeO_pEJkw

Will Nextor work on this branch?

[Msxinfo]

I will test it this week. Thanks for your effort!

[Msxinfo]

Tested your latest firmware for WT1.02d with the proposed EMA fix on turboR. Unfortunately It doesn't work.
After mentioning the sd card driver the diskdrive is accessed and the caps led and r800 led are on. But it doesn't go to nextor after that.

[herraa1]

Will Nextor work on this branch?

The Omega hangs too with that branch on a Wondertang 1.02d (the main branch works fine though).
It either freezes when showing the SD Card Nextor driver or at a later stage. Some times it drops to basic.

[Msxinfo]

The original WT 2.0b firmware works on turboR. I will test if that is also the case with the original WT 1.02d firmware. Luis Felipe has made an adaption for turboR in his firmwares. Thus technically we may assume that it can be integrated in tnCart firmware as well? But for me that is easier said then done. I'm no programmer.

[Msxinfo]

Any news concerning the tnCart firmware for WonderTang on turboR?

[buppu3]

Any news concerning the tnCart firmware for WonderTang on turboR?

It was confirmed that the system runs out of control when booted in R800 mode.
When powering on and booting in Z80 mode while holding down the “1” key, commands such as “CALL FDISK” seem to work.

This appears to be a malfunction caused by the UMA function, which increases memory latency.
If the V9990 and UMA functions are disabled, Nextor will work in R800 mode.