TFMSX Arrives
Moderators: terriblefire, Terriblefire Moderator
Re: TFMSX Arrives
Wow! nice work, I don't know much about the MSX except there are a few different generations/versions - where does your home-made one fit compared to the others spec wise?
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Re: TFMSX Arrives
First issue with the TFMSX. I was trying to clock the Z80 with a 3.3v clock. It appears to need a VCC-0.6v minimum for high on the clock lines. Everything else is much less picky so i found a 74LVC1G17 chip and patched it on there.
Seems much happier now as i see RD wiggle furiously.
Seems much happier now as i see RD wiggle furiously.
———
"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."
"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."
Re: TFMSX Arrives
exxos approves the bodge wires
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Re: TFMSX Arrives
Indeed, and a worthy pet project too. I'm just enjoying watching it get built. Somewhere down the track, if/when you release them to the usual suspects (And I have no expectations that this will happen, and want no part in applying any pressure for this to be anything more than a fun pet project for you) I'll probably see if I can purchase one. Not this year, however, as I am buying peripherals for all the systems I already own. So... many... shiny... systems!
Chesh
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Re: TFMSX Arrives
It’s alive!!!
Ok so this wasnt so straightforward. Adding the Schmitt buffer made the clock line ring like a church bell. and it didnt run at 3.58Mhz.
So now i need to make another one for @arkadiusz.makarenko so he can do the keyboard.
Ok so this wasnt so straightforward. Adding the Schmitt buffer made the clock line ring like a church bell. and it didnt run at 3.58Mhz.
So now i need to make another one for @arkadiusz.makarenko so he can do the keyboard.
———
"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."
"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."
Re: TFMSX Arrives
Great work, I'm excited to see what will come of this! MSX user since 1990 here. Two questions:
- Which BIOS are you using here?
- How are you handling cycles to the VDP for the turbo modes? Did you hook up the /WAIT signal?
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Re: TFMSX Arrives
I'm presently using the Bios from a HX-10.. keeping at simple as possible.
I've no turbo modes setup yet. but when i do i'll change CPU speed for different accesses so that VDP will always be at 3.58Mhz..
If anyone is interested the board uses 600mA @5V idling at a basic prompt.
I've no turbo modes setup yet. but when i do i'll change CPU speed for different accesses so that VDP will always be at 3.58Mhz..
If anyone is interested the board uses 600mA @5V idling at a basic prompt.
———
"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."
"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."
- arkadiusz.makarenko
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Re: TFMSX Arrives
:O
That was quick.
That was quick.
Do not trust people. They are capable of greatness.
~ Stanislaw Lem
~ Stanislaw Lem
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Re: TFMSX Arrives
Yeah i need some help now! USB keyboard!!!!
Here is how the keyboard matrix map looks...
PC0-3 are connected to the ARM like...
Code: Select all
PC0 = ARM PIN8
PC1 = ARM PIN9
PC2 = ARM PIN10
PC3 = ARM PIN11
Code: Select all
PB0 = ARM PIN 14
PB1 = ARM PIN 15
PB2 = ARM PIN 16
PB3 = ARM PIN 17
PB4 = ARM PIN 20
PB5 = ARM PIN 21
PB6 = ARM PIN 22
PB7 = ARM PIN 23
———
"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."
"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."
- arkadiusz.makarenko
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Re: TFMSX Arrives
I can find time for this...
Do not trust people. They are capable of greatness.
~ Stanislaw Lem
~ Stanislaw Lem