[offtopic]Some cheap and tiny ARM devices.

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marcov
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Re: 5$ Raspberry PI Zero

Postby marcov » Nov 30, 2015 11:22

sean_vn wrote:The 100 Mbytes per second for DRAM read is really fishy.


It's a move.

That's 25 million 32 bit integers per second. I think a 68000 CPU from 25 years ago could nearly equal that. Well, I can't say. Maybe they wired it up to an 8 bit DRAM chip, an 8-bit channel.


Even if that was 32-bit, the memory bus was at best 40MHz then (say an 68040 in a Quadra 840AV, which is big iron compared to an original 68000). So even if you could fetch a word every cycle, that would be 160MB/s read, 80MB/s R/W. And I doubt it could every cycle :-)
sean_vn
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Re: 5$ Raspberry PI Zero

Postby sean_vn » Nov 30, 2015 15:46

An 8 bit data channel is what you connect a Z80 to. Actually if you could put one 32 bit register into a Z80 and brought out 32 address pins, I think that would be more interesting for me. If you had been able to put a Z80 with 4 Gbytes of RAM in 1979 I'm sure there the world would be a very different place, with a very different style of programming and computer science would have taken very different research directions.
badidea
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Re: 5$ Raspberry PI Zero

Postby badidea » Nov 30, 2015 17:26

I don't see that much difference between the high end ddr2 and ddr4. Well it's not decades of magnitude difference.

I also discovered this recently (by testing). Low latency (+5 year old) DDR2 can be faster then current cheap DDR3 or DDR4.
marcov
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Re: 5$ Raspberry PI Zero

Postby marcov » Dec 02, 2015 8:44

badidea wrote:
I don't see that much difference between the high end ddr2 and ddr4. Well it's not decades of magnitude difference.

I also discovered this recently (by testing). Low latency (+5 year old) DDR2 can be faster then current cheap DDR3 or DDR4.


Did you test latency or burst?
D.J.Peters
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Re: 5$ Raspberry PI Zero

Postby D.J.Peters » Dec 20, 2015 5:15

Drago wrote:... I orderd 3 pi zero at reichelt. Looking forward to get them in December ...
Do you got the parts from Reichelt ?

Pollin does not ship it 2015 may be early 2016

Joshy
marcov
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Re: 5$ Raspberry PI Zero

Postby marcov » Dec 20, 2015 12:36

badidea wrote:
I don't see that much difference between the high end ddr2 and ddr4. Well it's not decades of magnitude difference.

I also discovered this recently (by testing). Low latency (+5 year old) DDR2 can be faster then current cheap DDR3 or DDR4.


I did some tests and for us it was the other way around, except for some extreme (manufactured) cases. We mostly benchmarked memmoves.
Drago
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Re: 5$ Raspberry PI Zero

Postby Drago » Dec 22, 2015 12:33

D.J.Peters wrote:
Drago wrote:... I orderd 3 pi zero at reichelt. Looking forward to get them in December ...
Do you got the parts from Reichelt ?

Pollin does not ship it 2015 may be early 2016

Joshy


No :(

Code: Select all

Auftrag vom   : 26.11.2015

Artikel               Menge           Offen       vorausstl. Termin
--------------------------------------------------------------------
RASP PI ZERO              3               3        01.04.2016


Rainer
D.J.Peters
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Re: 5$ Raspberry PI Zero

Postby D.J.Peters » Jan 10, 2016 23:11

PINE A64 first 64-Bit Single Board Super Computer
512 MB = $15, 1 GB = $19, 2 GB = $29
Image
youtube: https://www.youtube.com/watch?v=3CKO9kWLxS4
kickstarter: https://www.kickstarter.com/projects/pi ... per-comput
homepage: http://pine64.com

happy new year
Joshy
Last edited by D.J.Peters on Sep 22, 2017 5:40, edited 2 times in total.
caseih
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Re: 5$ Raspberry PI Zero

Postby caseih » Jan 11, 2016 0:08

Just a reminder that the $15 price tag on the PINE64 has no WiFi board included. That's an extra-cost feature, probably more than the board itself!

Pretty amazing how cheap and capable these little computers are becoming. Like most of the computers in this class, the PINE64 does have a large number of GPIO pins (3.3v). Also this board has a built-in LiPo charging circuit, something that is sorely missing on the Raspberry Pi.

It's also interesting to see that these little boards are actually useful and used for creative things. With the older generation of devices, they all ended up in my desk drawer, I'm afraid. Devices like the SheevaPlug, GuruPlug, Raspberry Pi 1, etc, that turned out to be much less useful in practice than in theory. I suspect 90% of the original Pis never made it out of drawers. But I've seen a few cool things done with it.
Drago
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Re: 5$ Raspberry PI Zero

Postby Drago » Jan 15, 2016 19:20

RasPi zero wrote:pi@PiZ01:~ $ fbc --version
FreeBASIC Compiler - Version 1.05.0 (12-19-2015), built for linux-arm (32bit)
Copyright (C) 2004-2015 The FreeBASIC development team.
pi@PiZ01:~ $


:-)

Next I have to get those wlan modules....and then the wiring :)

Greetings
Drago
srvaldez
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Re: 5$ Raspberry PI Zero

Postby srvaldez » Jan 15, 2016 19:43

the PINE64 is kickstarter project, there's no telling how long it would take for you to receive a unit, I made that mistake once with Parallella and will never do it again, it took over a year last time.
D.J.Peters
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Re: 5$ Raspberry PI Zero

Postby D.J.Peters » Jan 15, 2016 21:05

Drago wrote:Next I have to get those wlan modules....and then the wiring :)
A free ESP8266 book with 317 pages.
download: Kolbans-Book-on-the-ESP8266-October-2015.pdf

Joshy
Last edited by D.J.Peters on Jan 23, 2016 22:09, edited 1 time in total.
D.J.Peters
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Re: [offtopic] some cheap ARM devices

Postby D.J.Peters » Jan 23, 2016 21:39

C.H.I.P - The $9 Computer
OS: Debian Linux
Memory: 512 MB
Storage: 4GB (NAND high speed)
CPU: Cortex A8 1 GHZ (Allwinner) (ARMv7 supported by FreeBASIC)
GPIO pins, build in USB, WiFi, Bluetooth 4.0, Battery Charger ...

Image

youtube: Unboxing and First Boot and Getting Started

homepage: http://nextthing.co/pages/chip

Joshy
D.J.Peters
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Joined: May 28, 2005 3:28

Re: [offtopic]Some cheap and tiny ARM devices.

Postby D.J.Peters » Jan 29, 2016 3:54

hackaday wrote:...you could probably fit 120 Raspberry Pi Zero’s into a shoebox !

what a fun :-)

Joshy

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