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January 27, 2010

苹果推出ipad,这个产品本身的特色,貌似不多,倒是里面放了一个苹果自己的芯片A4很惹眼。10小时的电池时间,1GHz的主频,还有图形处理器和内存管理单元,这个芯片很强悍。

按照目前出来的一些数据,这个芯片是苹果08年收购的PA Semi设计的。P(alo)A(lto) Semi的创始人是当年DEC的Alpha 21064和StrongARM的设计师Daniel W. Dobberpuhl,就算在今天,也是相当强悍的两款芯片。公司里面有参与过Itanium, Opteron 和 UltraSPARC这三款强悍芯片的工程师,所以出来这么省电的高速处理器也不奇怪。

从指令集看,PA Semi曾经设计过基于POWER架构的PWRficient,而从目前的新闻看,这个A4应该也不是ARM架构。加上PWRficient是属于AIM(Apple, IBM, Motorola)联盟的,苹果在里面有自己的份额,所以A4基本上就是PWRficient架构了。如果PA Semi能以150人的团队,在不到两年的时间里面重新弄出一款和他们以前完全不一样架构的CPU,并且让Steve Jobs用在ipad里面,那才是奇迹呢。

根据wikipedia的数据,PWRficient是基于PA6T的64位架构,2GHz的最大功耗是7瓦,那么1GHz的A4如果真的是PWRficient,里面的CPU只有3.5瓦的功耗,加上图形,内存还有其他外设的控制器,这个System On Chip的功耗应该能控制在5瓦上下。这样我们就可以估算一下ipad的电池是不是很强悍了。

更好玩的是PA6T的架构里面有对虚拟机的支持,难道ipad上面是用虚拟机跑的iphone操作系统?还是只有iphone的app是在ARM的虚拟机里跑的?这个虚拟机的想象空间太大了,比如在这个上面跑个Android如何?

September 12, 2009

因为员工在会议里面使用iphone而发脾气,原文在这里

August 28, 2009

iphone进入中国了,unicom销售。

August 22, 2009

昨天装了黑金塔,很自然的去看了apple4.us,居然就看到这篇“苹果电脑多任务功能的进化简史(一)”,里面的那些早期的Mac界面图片,让我想起了我最早的那台Mac.

我那台Mac的来路很奇特。当时我们刚到美国几个月,有朋友说要送我们一个旧沙发床,结果来送的人我们完全不认识。他老兄说自己手上有好多有历史的旧东西,比如这个沙发床,就是某个80多岁的老奶奶的,这个老奶奶在这个沙发床上面养大了她所有的娃。然后这个老兄问我是干嘛的,知道我是学计算机的,就说:那我这里有个东西你要不要?

接着他就去车里拿了个厚厚的笔记本出来,白色的外壳已经开始发黄,但是上面的苹果标记还是让我很敬仰的接了过来。打开来,浅灰色的键盘,键盘下方还有一个轨迹球,要知道这个东西怎么看都是80年代的东西,80年代,笔记本?轨迹球?

电池自然是没电了,我翻了翻自己的工具箱,找到一个电源正好符合规格。接上电,按下启动按钮,单色显示器上面就出现了Mac的启动画面。

我留下了这个老古董,甚至后来我着迷汽车计算机界面的时候,还在上面开发了点小东西,又专门焊了一根电缆,用来和我做的汽车计算机接口通信,直到它最后坏掉。

和现在我手边这台装了黑金塔的MSI WIND相比,我必须说,Mac在用户界面的保持上面,要比windows做的好太多了,如果说从win31到win95我还可以容忍的话,那么到WinXP几乎就是一场灾难,难怪当时系主任给全系的研究生发了个email,里面只有一张照片,就是学校门口的小店的招牌:We remove XP 【我们卸载XP】。而苹果的界面,左上角那个苹果的标志,这么多年以后,依然在那里。

扯远了。apple4.us那篇文章里面提到的简单硬件上面的多任务切换,在当时的个人计算机世界里面的确是个问题。原因主要是硬件没有跟上,16位的芯片里面,支持虚拟内存管理的功能还没有呢。于是程序员们只好用各种办法去截获中断,切换内存,或者让程序驻留在内存里面,直到便宜的CPU进入32位的时代。

August 21, 2009

今天在MSI WIND上面装了黑金塔10.5.7,自带的中文输入法真不好用。另外摄像头也有点问题。