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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: rja4096 on July 12, 2008, 09:22:18 PM
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Hi, the project is likley to take a long time, but here is an update.
Did an experiment tonnight with how I'm going to power the thing from batteries and a DC to DC step down adapter. Main part of experiment was to see if the -12V is really required, have read this is only used for RS232 port and audio op amps. - well the whole thing DOES work without the -12v, but sound is sometimes distorted - so looks like I WILL need -12V as after a while it sounded unbearable.
Which makes powering the thing a bit complex as I'll need +5, +12, -12 and +7.5 for the LCD screen. - which is a lot of DC to DC converters?
- Any ideas?
by the way, I have not got any dc to dc converters yet, to do the above experiment I had to disconnect the power plug from the A600, and link with wires into where they would normally go - either with or without the -12v.
Any help appreciated, Thanks, Rick.
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I'm starting to think a Sinclair Spectrum Laptop project might be easier - just one 9v supply needed.
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Unlike the Amiga, you can make your own spectrum-on-a-chip very easily. (Hey that is SoC!)
The full gate level hardware design of the spectrum custom chips (ULA) is known.
You can implement in a modern CPLD easily and know you'll be 100% compatible, and then you can have any I/O or voltage requirements you like (within reason).
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FPGA + Amiga = MiniMig - should be possible to make portable. Needs only +5 V DC to operate...
I.m working on it...
(http://www.illuwatar.se/project_pages/mini-minimig/images/mini03.jpg)
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Cool!