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Author Topic: 6Mhz and more... (Read 23948 times)

Offline BruceTanner

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Re: 6Mhz and more...
« Reply #135 on: 2017.December.23. 18:44:39 »
To Bruce: i left 08-0Fh for the EPNET, it is will ok? When not need the ROM/RAM expansion function from the EPNET card, because many other ROM/RAM in the system. In the first configuration also possible put it to 80-8Fh.
Yes EPNET decodes any 512k block and the ROM can go on any 64k boundary within the 512k. The remaining 64k blocks in the 512k can be RAM or not used, if not used the bus is not driven. :ds_icon_cheesygrin:

Online pear

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Re: 6Mhz and more...
« Reply #136 on: 2017.December.23. 19:51:10 »
Memory map:

Offline Zozosoft

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Re: 6Mhz and more...
« Reply #137 on: 2017.December.23. 20:10:42 »
Great!

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Re: 6Mhz and more...
« Reply #138 on: 2017.December.27. 07:40:15 »
Something about power supply.

The card in the full version, with LCD display and backlight, may require a maximum of 650 mA of current from the 5V supply.
Therefore, it will optionally have its own stabilizer directly from the 9V supply.
For the OLED display (not need backlight), the total current is between 450-500 mA.
I'm also wondering about the version without the display.
It will save another 50 mA, but will require other software (configuration in the dark ;) ).

The values of current given are the maximum values.
I have to use them to ensure stable operation of the card.
The average current needed to work will be about 30% smaller.

Offline Zozosoft

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Re: 6Mhz and more...
« Reply #139 on: 2017.December.27. 09:22:03 »
How many the consumption of the old 64K DRAM card? This is will be - when it is replaced :-)
"own stabilizer directly from the 9V supply"
This is a step down circuit which is more effective than the 7805?
« Last Edit: 2017.December.27. 10:11:45 by Zozosoft »

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Re: 6Mhz and more...
« Reply #140 on: 2017.December.27. 09:37:18 »
Oh my. I have just checked that the old 64K module consumes almost 500 mA :shock: (one of NMOS 4164 may pull at max 48mA of current).
As an option, can be leave an additional power supply.
Yes, step-down DC/DC (LM2675).
By the way, I used it to generate the bias voltage for the LCD contrast (-5V).
« Last Edit: 2017.December.27. 09:59:08 by pear »

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Re: 6Mhz and more...
« Reply #141 on: 2017.December.27. 10:44:49 »
In terms of synchronization of clocks switching, I found an article about the subject :idea:
I hope it works.
Most ideas from the internet usually do not work :ds_icon_frown:

Offline Zozosoft

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Re: 6Mhz and more...
« Reply #142 on: 2017.December.27. 11:22:28 »
If it is don't work then for a last idea I can try disassemble SMD Turbo card... removing ICs, and trying to find types in IC tester.

Offline Zozosoft

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Re: 6Mhz and more...
« Reply #143 on: 2017.December.28. 16:25:36 »
Encoder to change settings.
Instead of a flock of buttons ;)
How will work the controlls?

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Re: 6Mhz and more...
« Reply #144 on: 2017.December.29. 06:16:46 »
The encoder can be rotated left and right (unlimited) and pressed.
This is enough to navigate the menu.
Something similar is in this movie.
My idea is a bit different. I want to use a hardware blinking cursor for menu items marking, instead of every time redraw the screen.
« Last Edit: 2017.December.29. 06:21:11 by pear »

Offline gflorez

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Re: 6Mhz and more...
« Reply #145 on: 2017.December.29. 10:32:25 »
Imagine to put remote control like this...

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Re: 6Mhz and more...
« Reply #146 on: 2017.December.29. 10:45:17 »
Cool :ds_icon_cheesygrin:
It has only one drawback. When there is no cable, it's easy to get lost :lol:

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Re: 6Mhz and more...
« Reply #147 on: 2017.December.30. 12:56:40 »
Eight-channel clock selector with glitch free switching.
Time for testing.
However, drawing goes better than coding in VHDL ;)

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Re: 6Mhz and more...
« Reply #148 on: 2017.December.30. 17:23:19 »
What is the 1 MHz clock signal for ?
Is not it to the sound synthesis system ?
I can output a third channel with a frequency independent of the selected processor clock speed.

Offline Zozosoft

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Re: 6Mhz and more...
« Reply #149 on: 2017.December.30. 17:53:49 »
It is come from Dave chip. I don't know anything which is use it.