MSX USB

Page 6/8
1 | 2 | 3 | 4 | 5 | | 7 | 8

By lintweaker

Master (198)

lintweaker's picture

26-03-2020, 10:15

Looking at this again, I think I am going to create a PCB for it Smile
are there complete nextor/driver images for the flash?

By S0urceror

Resident (50)

S0urceror's picture

26-03-2020, 14:20

Hi Lintweaker, yes I have a complete Nextor image to operate the CH376s with USB memory sticks. Basically you can plug in every FAT32 storage and make multiple FAT16 images that Nextor supports on it.

On top of that I have developed a USB Host ROM and the rest are software drivers you can run on top of it. Unfortunately you can not run the CH376s both as storage and as something else (keyboard, ethernet) at this time. For this I first have to develop USB Hub support.

I am thinking about combining the USB Host ROM with the Nextor storage driver to make things easier to install and run.

I was not able to both make a PCB and Software at the same time. Smile
Looking forward to see the result of your work!

By S0urceror

Resident (50)

S0urceror's picture

26-03-2020, 16:13

Popolon, there is one 74ls32 chip but I forgot to select the right gate for the Flash Rom write signal. Updated the schematics. Thanks for spotting.

By lintweaker

Master (198)

lintweaker's picture

26-03-2020, 16:47

SOurceror,
A13 and A15 are used on the 670s but these signals are not used on the MSX cartridge connector.

By lintweaker

Master (198)

lintweaker's picture

26-03-2020, 16:53

Preview of my MSX USB cartridge (passives on the back, also a SD connector). PCB not yet cut to size.

By S0urceror

Resident (50)

S0urceror's picture

26-03-2020, 17:32

Wow, that's fast. A13 and A15 for the ASCII mapper are indeed not yet connected to the cartridge connector. I'll fix.

Btw. do you know a good address for a low-volume test PCB fabrication run? Think we have to reduce PCB size. We should also include decoupling capacitors for all IC's. And use through-hole IC's for easy soldering. What is D1, U1, U6?

By lintweaker

Master (198)

lintweaker's picture

26-03-2020, 18:01

all decoupling is on the back op the PCB Smile I use SMD 0805 for all resistors and caps.
D1 is the activity led for the CH376S (U6) and U1 is the 5 to 3.3V converter.
I am not using a CH376S module but directly the chip itself with all the needed parts.
Also U5 is a PLD (so no 688 and 32)

for making the PCB I usually resort the JLPCB. They are pretty quick and a good price for the quality.
This board will be a bit more expensive as I probably will use ENIG (gold) finish to make the cartridge more durable.

By popolon_

Supporter (12)

popolon_'s picture

26-03-2020, 18:47

SOurceror,
now there comes error from scheme:
Error: Multiple item U2 (unit 5)
Error: Different values for U2E (74LS32) and U2A (74LS670)

for PCB, that non-SMD version would be good to have.

By S0urceror

Resident (50)

S0urceror's picture

26-03-2020, 19:21

Cool lintweaker. Like your approach. Yes a PLD is much more versatile than discrete logic. I'm interested once you're done.

By lintweaker

Master (198)

lintweaker's picture

26-03-2020, 19:31

S0urceror wrote:

Cool lintweaker. Like your approach. Yes a PLD is much more versatile than discrete logic. I'm interested once you're done.

Thanks! I'll report my progress here.

BTW does programming the flash from MSX work?

Page 6/8
1 | 2 | 3 | 4 | 5 | | 7 | 8