The TFMSX Is out of the bag...

Help & news on accelerators from TF, Amiga, Atari, CD32 etc

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The TFMSX Is out of the bag...

Post by terriblefire » Wed Mar 17, 2021 9:26 pm

The TFMSX will be a complete machine.

Rev 0 aims... subject to the stocks of trappist beer lasting.

1. 512K of SRAM (because it takes less space than DRAM)
2. 128K Video RAM. (Unfortunately Through hole 41464 chips as thats the only thing the VDP will speaks to).
3. VDP9958 chip.
4. ST Sound Chip.
5. SCC Sound emulation via the central logic + Sigma Delta DAC.
6. 2 x Cartridge Slots.
7. Space permitting a floppy interface.. probably no room though.
8. Scart only video output.

Remaining unknowns..

1. Do carts really need +12V and -12v and if so how to get those out nicely off a 5V supply. (probably not)
2. Are there any hobby cases that would be worth looking into supporting/fitting into.
———
"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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arkadiusz.makarenko
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Re: The TFMSX Is out of the bag...

Post by arkadiusz.makarenko » Wed Mar 17, 2021 9:54 pm

So it is whole new computer, not expanding existing one?
Do not trust people. They are capable of greatness.
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Re: The TFMSX Is out of the bag...

Post by terriblefire » Wed Mar 17, 2021 10:02 pm

arkadiusz.makarenko wrote:
Wed Mar 17, 2021 9:54 pm
So it is whole new computer, not expanding existing one?
Yeah why not.. they are stupidly simple.

I mean compared to a TF1260 its banging rocks together simple
———
"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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8 Bit Dreams
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Re: The TFMSX Is out of the bag...

Post by 8 Bit Dreams » Wed Mar 17, 2021 10:44 pm

:idea: interesting,
I've, just started to order parts for this MSX2 clone:
https://github.com/skiselev/omega
Retro computer hardware & repair in Germany

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Re: The TFMSX Is out of the bag...

Post by terriblefire » Wed Mar 17, 2021 11:55 pm

I like the Keyboard on that solution ... really nice.

I'm kinda thinking of either stealing that keyboard or using the TF riser and putting a USB keyboard on it.
———
"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: The TFMSX Is out of the bag...

Post by arkadiusz.makarenko » Thu Mar 18, 2021 9:26 am

terriblefire wrote:
Wed Mar 17, 2021 11:55 pm
I like the Keyboard on that solution ... really nice.

I'm kinda thinking of either stealing that keyboard or using the TF riser and putting a USB keyboard on it.
If you need ARM keyboard firmware, I do have some experience with those already ;)
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

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Re: The TFMSX Is out of the bag...

Post by terriblefire » Thu Mar 18, 2021 9:42 am

Hehe... Yes you and a certain crazy Frenchman living in Ireland will be the first to get a board.
———
"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: The TFMSX Is out of the bag...

Post by terriblefire » Thu Mar 18, 2021 9:53 am

arkadiusz.makarenko wrote:
Thu Mar 18, 2021 9:26 am
If you need ARM keyboard firmware, I do have some experience with those already ;)
Wanna use the same arm chip? I can just copy paste the circuit over to the MSX
———
"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: The TFMSX Is out of the bag...

Post by PhilC » Thu Mar 18, 2021 10:24 am

Nice project, I was just joking about the name :lol:

If you need any help, ie ST sound chips and ram then give me a shout as I should have both.
If it ain't broke, test it to Destruction.

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Re: The TFMSX Is out of the bag...

Post by terriblefire » Thu Mar 18, 2021 10:28 am

Thanks.. i''ve been looking for an alternative to the 41464 ram chips that can interface to a 9958VDP. If anyone has any ideas about that i'm all ears.

Also i am going to consider a partial 7Mhz mode .. Probably some kinda stunt like the TF330 where the clock changes speed based on the address being accessed. Although i'm not sure what can actually use it ...

Suggestions so far have been (maybe)

http://www.grauw.nl/projects/vgmplay-msx/
———
"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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