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Author Topic: z80-like portable computer for <$30! (If you build one)  (Read 54016 times)

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Offline Streetwalrus

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #105 on: October 06, 2013, 03:57:38 pm »
Well, I've been able to watch it and it looks really cool. :D
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Offline Keoni29

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #106 on: October 06, 2013, 06:16:16 pm »
Thank you. I worked really hard on it this weekend.
« Last Edit: October 06, 2013, 06:16:39 pm by Keoni29 »
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Offline willrandship

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #107 on: October 06, 2013, 09:22:20 pm »
That's pretty fancy. Are the programs being run on the propeller or the ez8?
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Offline TIfanx1999

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #108 on: October 07, 2013, 12:08:16 am »
Nice work Keoni! :)
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Offline Keoni29

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #109 on: October 07, 2013, 02:17:35 am »
Everything runs on the ez8. Th propeller chip is just a serial terminal at the moment.
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Offline DJ Omnimaga

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #110 on: October 07, 2013, 11:46:38 am »
I like how this runs on a TV. It makes it look even more old school. You should do a small game demo on it. ^^
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Offline Keoni29

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #111 on: October 07, 2013, 12:08:14 pm »
Yeah I took that into consideration when I had to choose between VGA, LCD and TV.
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Offline Keoni29

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #112 on: October 11, 2013, 08:53:24 am »

link

After a 5 hour non-stop coding session I finally got the string parsing to work. With the new routines I wrote I am able to split a string up in segments and store the address of the segments in a table with pointers.

Example:
command "string with spaces in it" 2345 OtherStuff
is interpreted as:
command
string with spaces in it
2345
OtherStuff

These are all strings. There is no routine for converting strings to integers yet. Data conversion should be taken care of by the program.

Program PING is fairly straightforward.
pseudocode:
Code: [Select]
print "pong:"
if argc>=2
print argv[1]
end
return
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Offline Streetwalrus

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #113 on: October 11, 2013, 11:27:15 am »
Cool ! You make me more and more want to build an ez80 (not typo) based computer. :D
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Offline Keoni29

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #114 on: October 11, 2013, 11:31:56 am »
Yeah I'd like to work with that microprocessor some day too. I might just order a bunch sometimes.
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Offline Spyro543

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #115 on: October 11, 2013, 12:35:09 pm »
Nice to see that you're making some real progress! I haven't really worked on my PIC computer idea at all...(you can thank the new Terraria update for that :P)
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Offline Keoni29

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #116 on: October 13, 2013, 05:03:21 pm »
I have an evaluation board with an eZ8 on it that I use for developing the software. It's a lot more convenient than my previous setup with a tv capture card. Once the firmware is done I will put it all in a box with a keyboard on it and use it as a stand-alone device.

Screenshot of the pc serial terminal software I use at the moment:

This is a program I am working on that allows you to hex edit flash.
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Offline willrandship

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #117 on: October 13, 2013, 08:17:16 pm »
Imagine how much easier that would be if we had access to the external data memory bus. Up to 64 KB of external RAM? Memory-map some to external peripherals and we'd have a pretty sweet hardware bus (not to mention another 64 KB of RAM)
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Offline Keoni29

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #118 on: October 14, 2013, 02:51:24 am »
I'd suggest using an eZ80 in that case.
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Offline Eiyeron

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Re: z80-like portable computer for <$30! (If you build one)
« Reply #119 on: October 14, 2013, 02:52:27 am »
I like how the fist thing we see is a SYNTAX ERROR! :p
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