MSXDISK 0.9 BETA: Virtual Floppy Disk Driver over JOYSTICK2 of MSX

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By st1mpy

Paladin (779)

Аватар пользователя st1mpy

03-03-2021, 00:29

I was using an eeprom for the disk rom, but I also tried a megaflashrom scc+ (the one without sd) flashed with the disk rom provided and it works. It would be interesting to see other people try.

By ocitygate

Expert (67)

Аватар пользователя ocitygate

03-03-2021, 10:58

larsthe18th wrote:

But unfortunately MSXDISK 0.93 it is still not working. When sending the diskrom i immediately get (Error: 0x01 on MSX)

Are the CPUs running at 3.58MHz?

larsthe18th wrote:

WIth TST232 i only see Errors on the PC window (Erros: 2039/2040/2044/..)
I have tested it on a Philips NMS8250 (MSX2) and a Philips VG-8020 (MSX1).
Any idea what the problem could be.?

TST232.EXE sends 2048bytes of random data to MSX and MSX sends them back.
Errors: xxx indicates how many bytes have changed.
I think your RAM is not located in Slot 2. Therefore it is sending back some ROM or blank data.
I will update the software to select the correct RAM slot.

By larsthe18th

Master (181)

Аватар пользователя larsthe18th

03-03-2021, 13:04

Thanks for your reply, Yes both machines run on 3.58Mhz (50Hz)
In most Philips MSX machines RAM is located in Slot 3-2.

I also going to try the ROM in Eprom and Flashrom later.

By ocitygate

Expert (67)

Аватар пользователя ocitygate

03-03-2021, 17:26

larsthe18th wrote:

In most Philips MSX machines RAM is located in Slot 3-2.

Try the new TST232.ZIP 0.1. It selects the correct RAM slot now.

Error: 0x01 means that the RX line was not found high.
It could be some interrupt delaying the RX routine.
I could delay sending from PC more to allow the MSX more time.
Can you send a screenshot of the error to determine exactly when it happens?

By ocitygate

Expert (67)

Аватар пользователя ocitygate

03-03-2021, 18:58

Version 0.94 Released MSXDISK.ZIP
Fixed issue with ROMLDR2.CAS not selecting the correct RAM slot.

By larsthe18th

Master (181)

Аватар пользователя larsthe18th

05-03-2021, 14:24

YES - We have made some progress...
The TST232-0.1 work flawlessly now, no errors.

With MSXDisk 0.94 i still get error 0x01, after the first . (Dot)

Waiting for ROM...
Loading ROM.
Error: 0x01

Yes we can try if a delay will solve this.

By ocitygate

Expert (67)

Аватар пользователя ocitygate

05-03-2021, 17:38

larsthe18th wrote:

With MSXDisk 0.94 i still get error 0x01, after the first . (Dot)

It is strange since the code is identical to TST232.
So I want to make sure that you are loading the latest ROMLDR2.

By larsthe18th

Master (181)

Аватар пользователя larsthe18th

05-03-2021, 19:56

Yes, very strange, let me show you 2 video's

- TST232
https://youtu.be/Okzu4WiJM5I

-MSXDISK 0.94
https://youtu.be/kigzouQcsh0

First try - load the DiskRom, error after one dot.
Second try - load a Konami ROM (Baseball) 16k... Error 0x01 afer 7 dots .......

By larsthe18th

Master (181)

Аватар пользователя larsthe18th

05-03-2021, 21:45

Wow, i flashed the Disk.Rom in to a Flashrom and inserted it in to my MSX1 Slot.
Started MSXDSK 0.94 and mounted a DSK file..... And it works !!! Smile the mounted disk is Booting ...

Strange that it won't load with ROMLDR2.CAS... i'll try to load it from a different device.

By ocitygate

Expert (67)

Аватар пользователя ocitygate

05-03-2021, 21:51

larsthe18th wrote:

First try - load the DiskRom, error after one dot.
Second try - load a Konami ROM (Baseball) 16k... Error 0x01 afer 7 dots .......

Try this special build with increased delay from 50ms to 100ms
MSXDISK_0.94.1.ZIP

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