TFMSX Design (complete)

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Re: TFMSX Design (Almost complete)

Post by terriblefire » Sat Mar 20, 2021 6:16 pm

arkadiusz.makarenko wrote:
Sat Mar 20, 2021 6:01 pm
May I ask about parts availability? Is it possible to get them as NOS or those need to be acquired from MSX?
Parts required are the YM chip (Exxos sells them), Z80A (widely available) and the VDP9958/VDP9938... those are still obtainable.

The rest is TerribleFire technology.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: TFMSX Design (Almost complete)

Post by arkadiusz.makarenko » Sat Mar 20, 2021 7:55 pm

terriblefire wrote:
Sat Mar 20, 2021 6:16 pm
arkadiusz.makarenko wrote:
Sat Mar 20, 2021 6:01 pm
May I ask about parts availability? Is it possible to get them as NOS or those need to be acquired from MSX?
Parts required are the YM chip (Exxos sells them), Z80A (widely available) and the VDP9958/VDP9938... those are still obtainable.

The rest is TerribleFire technology.
What chip will be behind TerribleFire technology?
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

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Re: TFMSX Design (Almost complete)

Post by terriblefire » Sat Mar 20, 2021 7:57 pm

arkadiusz.makarenko wrote:
Sat Mar 20, 2021 7:55 pm
What chip will be behind TerribleFire technology?
Either a XC95288XL or XC95144XL.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: TFMSX Design (Almost complete)

Post by arkadiusz.makarenko » Sat Mar 20, 2021 8:19 pm

terriblefire wrote:
Sat Mar 20, 2021 7:57 pm
arkadiusz.makarenko wrote:
Sat Mar 20, 2021 7:55 pm
What chip will be behind TerribleFire technology?
Either a XC95288XL or XC95144XL.
What is plan for loading data, since cassette interface is gone?
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

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Re: TFMSX Design (Almost complete)

Post by terriblefire » Sat Mar 20, 2021 8:28 pm

arkadiusz.makarenko wrote:
Sat Mar 20, 2021 8:19 pm
What is plan for loading data, since cassette interface is gone?
I'm told that most people use carts thesedays.. The board has 2 cart slots.

I guess we could also emulate a tape from the ARM?
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: TFMSX Design (Almost complete)

Post by 8 Bit Dreams » Sat Mar 20, 2021 9:32 pm

Just grab Carnivore2 Cartridge,
There ist nothing better for MSX2 for now:

https://github.com/RBSC/Carnivore
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Re: TFMSX Design (Almost complete)

Post by terriblefire » Sat Mar 20, 2021 9:40 pm

8 Bit Dreams wrote:
Sat Mar 20, 2021 9:32 pm
Just grab Carnivore2 Cartridge,
There ist nothing better for MSX2 for now:
I have repro carts from someone.. I know those everdrives are nice but... i like the physical changing of carts
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: TFMSX Design (Almost complete)

Post by terriblefire » Sun Mar 21, 2021 9:16 am

@arkadiusz.makarenko .. I need some info on how you want the ARM wired up to the main CPLD/PSG for keyboard purposes.

I *think* We are bascially emulating the circuit on page 26/PDF29 of

http://map.grauw.nl/resources/system/msxtech.pdf
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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Re: TFMSX Design (Almost complete)

Post by arkadiusz.makarenko » Sun Mar 21, 2021 10:54 am

Screenshot_20210321-103712_Drive.jpg
Screenshot_20210321-103712_Drive.jpg (69.08 KiB) Viewed 1944 times

So if we want to wire this grid to this?

Screenshot_20210321-104256_Drive.jpg
Screenshot_20210321-104256_Drive.jpg (74.44 KiB) Viewed 1944 times

Then we will be using only GPIOs. So any pin can be set up and configured as needed. I think all pins on f7 are 5V tolerant.
Unless it has to respond in less than few uS, then it is not important.
Do not trust people. They are capable of greatness.
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Re: TFMSX Design (Almost complete)

Post by terriblefire » Sun Mar 21, 2021 11:40 am

i'll wire IOA of the PSG to Port A, IOB to port B.

I'm not planning to put the mux chips on unless you think thats important or would slow the software down?
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."

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