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Forum Index : Microcontroller and PC projects : The Maximite
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Bryan1 Guru  Joined: 22/02/2006 Location: AustraliaPosts: 1352 |
G'day guy's, Well after hand drill bit in and broke one of my fingers today it does look like I have some time to get my Maximite board finished. I just need to get the mini sd card dongle out of an old mp4 player and hash up a usb hack then I'm ready to load up the firmware. By using the kiwacan 64/80 pin board and the proto board above I still have plenty of room to add circuits if and when they are needed. Having a few old computers here turned out to be a bonus as the header wire thats used on the front panel are purfect for jumper wires. I'll see how I go tomorrow and hopefully I can get it going. Cheers Bryan |
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vasi Guru Joined: 23/03/2007 Location: RomaniaPosts: 1697 |
You know what is amazing at this board (comparing to ZX-Spectrum and other old 8bit personal computers)? It is ONE chip computer! No RAM chips, no video-RAM chips, no peripheral chip, no EPROM, etc. It is a little BASIC computer, with an wonderful extra: a simple interface to peripherals (again, compared to the old computers). I tried in the past to build an ZX_Spectrum compatible (COBRA 2, never completed but I still have some components as Z80 CPU, Z80 PIO, 8255, etc.) and I know the difference. Vasi Hobbit name: Togo Toadfoot of Frogmorton Elvish name: Mablung Miriel Beyound Arduino Lang |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Bryan Watch out for the high tech tools coming from China you cant trust them. or for that matter a mans best friend can sometimes cause computer problems also. 
Wife on a spring cleaning spree without her glassed on is also a hazard to to the construction of small electronic projects. So make sure all is finished before spring. All the best Bob Foolin Around |
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| Xmaswiz Regular Member  Joined: 14/04/2011 Location: United StatesPosts: 69 |
too funny  Santa Maria, CA. Noel |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3208 |
Yes, correct. +3.3V = no card. 0V = card inserted. Geoff Geoff Graham - http://geoffg.net |
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| Talbit Senior Member  Joined: 07/06/2011 Location: AustraliaPosts: 210 |
Geoff, I recon there is an error in the circuit for the 16 * 2 LCD display. Line 10160 has it right - pins 13 to 16 are D4 to D7 but the circuit is the wrong way around. The program seems to support line 10160. The Maximite is a great unit. Regards Talbit Talbit |
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| Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3208 |
Yes, you are right - pin 13 goes to D4, 14 to D5, etc. Thanks for the advice and I will fix the documentation ASAP Geoff Geoff Graham - http://geoffg.net |
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| rhamer Senior Member Joined: 06/06/2011 Location: AustraliaPosts: 174 |
Hi everybody, Just letting you know that V2 of the maximite expander is on it's way soon. This version has the hardware to support RS232 when the firmware is updated. More info at www.hamfield.com.au Cheers Rohan Rohan Hamer HAMFIELD Software & Hardware Solutions Makers of the Maximite Expander. http://www.hamfield.com.au |
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BobDevries Senior Member Joined: 08/06/2011 Location: AustraliaPosts: 266 |
Hmm, I'm not sure what the protocol is for posting MMBASIC programmes here. Do I just include them in-line? I've just done a conversion from QBasic of an analog clock, and in the process discovered what may be a bug. The unary negate does not appear to work. If I have this in my code: Hr = -COS(angle) the result is always 0 (actually -0) If I change it to: Hr = 0 - COS(angle) it works as expected. Regards, Bob Devries Dalby, QLD, Australia |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
The forum has a function for displaying code. At the bottom of the reply window you'll see a link called Forum Codes. Its will display all the functions you can use within your post. The Code dunction lools like this 10 for I=1 to 10 20 print I 30 next I Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| BobDevries Senior Member Joined: 08/06/2011 Location: AustraliaPosts: 266 |
Yet another MMBasic command suggestion..... I think that a COLOUR command would be useful. Before everyone flames me because we don't have any colours, even with just colour 0 for black and colour 1 for white it could be useful. I'm sure it would need a major revision of the code to implement this, since every command which puts something on the screen would be affected. What it would allow, for instance, is to print in black characters on a white background, something which is not currently possible. Regards, Bob Devries Dalby, QLD, Australia |
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| Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3208 |
Hi Bob, I was planning a FONT command. It would allow you to select a number of fonts of various sizes and also background colour (0 or 1) and foreground colour (same) and underline and anything else that I can fit in (blinking might be a bit hard). I believe the larger fonts would be useful to someone building an embedded Maximite project with a small (say 3.5in screen) as they would not be able to read the normal font. I have not checked how MSBasic did it (perhaps with a COLOUR command) but it would be hard to keep compatible as it did not have selectable fonts. Also, thanks for the unary negate bug report. I will add it to the list. Ah, so much to so and so little time !!! Geoff Geoff Graham - http://geoffg.net |
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| Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3208 |
The unary negate bug was easily fixed. So easy that it has left me worrying that it was too easy (what I have missed?) You can try out the fix in yet another bug fix update: http://geoffg.net/Downloads/Maximite/Maximite_Update_V2.3C.z ip At this rate we will reach the suffix 'Z' before I can get out a proper 2.4 release. Geoff Geoff Graham - http://geoffg.net |
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VK6MRG Guru Joined: 08/06/2011 Location: AustraliaPosts: 347 |
Quick question, what is the difference between the 64 pin version and the 100 pin version and the 121 pin version of the PIC32MX795F512 chip? Could a miximite be made with the 100 or 121 pin version assumming that it has more I/O pins? Maybe give the maximite colour vga without taking up I/O's that could be used for other jobs. I will print out the PICMX5XX/6XX/7XX Family Data Sheet and have a read (256 pages) , so it may take me a while to find out the answer.
VK6MRG Matthew Its easier to ask forgiveness than to seek permission! ............VK6MRG.............VK3MGR............ |
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| vasi Guru Joined: 23/03/2007 Location: RomaniaPosts: 1697 |
I guess you only need to take a look at pinout diagram. Vasi Hobbit name: Togo Toadfoot of Frogmorton Elvish name: Mablung Miriel Beyound Arduino Lang |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Guys Have fun but don't get frustrated 
All the best Bob Foolin Around |
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| BobDevries Senior Member Joined: 08/06/2011 Location: AustraliaPosts: 266 |
Here's a screen dump of the analog clock programme which I'm porting to the maximite. 
Regards, Bob Devries Dalby, QLD, Australia |
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