tag:blogger.com,1999:blog-6264947694886887540.post1776539597405547675..comments2024-03-29T00:37:46.515-07:00Comments on Ken Shirriff's blog: Inside the Apple-1's unusual MOS clock driver chipKen Shirriffhttp://www.blogger.com/profile/08097301407311055124noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-6264947694886887540.post-44131545451385929662022-04-13T17:58:16.216-07:002022-04-13T17:58:16.216-07:00Woz really is a genius! and a beautiful guy all ar...Woz really is a genius! and a beautiful guy all around. I'm a fan of his, can't you tell? :/ I don't know how Woz put up with Jobs, they are so un-alike. Thank you for showing us this wonderful example of engineering, it's really top-notch. Easyhttps://www.blogger.com/profile/04591871193404343343noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-73794427578059502582022-04-04T19:29:00.267-07:002022-04-04T19:29:00.267-07:00Thank for for writing this. I had long assumed tha...Thank for for writing this. I had long assumed that the Apple-1 was merely an Apple II with less DRAM and a simpler display generator. I never bothered to look for a schematic. Needless to say, I enjoyed reading this article to learn the details. It is great learn these extra little steps in the evolution of computers, and I appreciate your continuing efforts.Brian Willoughbynoreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-78636339493467600082022-03-26T02:27:01.764-07:002022-03-26T02:27:01.764-07:00On note 1:
First idea was Apple 1 to use SRAM in o...On note 1:<br />First idea was Apple 1 to use SRAM in order to avoid circuit for DRAM refresh.Jordannoreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-48915264161851089782022-03-24T13:03:51.975-07:002022-03-24T13:03:51.975-07:00I put a note in the caption for the die image, but...I put a note in the caption for the die image, but you're right, I should explain in the text too.Ken Shirriffhttps://www.blogger.com/profile/08097301407311055124noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-69436518322057832632022-03-24T12:55:23.061-07:002022-03-24T12:55:23.061-07:00Ken,
I must be stupid, but I don't see any upd...Ken,<br />I must be stupid, but I don't see any update or note about the diagram in the section starting with "The chip's circuit" to explaine the CR# is really D# in today's useage. Feel free to nuke my comments if need be! :-)John Shttps://www.blogger.com/profile/01934119151415487359noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-20112298154420725322022-03-24T12:50:50.059-07:002022-03-24T12:50:50.059-07:00Ken,
Thanks for your update! I really enjoy (but ...Ken,<br />Thanks for your update! I really enjoy (but don't always understand!) the information you provide, and I keep learning new things all the time. <br />John Shttps://www.blogger.com/profile/01934119151415487359noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-91903701442118564352022-03-23T17:25:52.383-07:002022-03-23T17:25:52.383-07:00John: yes, the diodes are labeled CR in the schema...John: yes, the diodes are labeled CR in the schematic but D in the diagram. Apologies for the confusion. I've added a note to the diagram. Thanks, Clonkex, for the explanation above.Ken Shirriffhttps://www.blogger.com/profile/08097301407311055124noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-71834781890313240542022-03-23T16:29:40.494-07:002022-03-23T16:29:40.494-07:00@JohnS According to the Wikipedia page, CR stands ...@JohnS According to the <a href="https://en.wikipedia.org/wiki/Diode#Abbreviations" rel="nofollow">Wikipedia page</a>, CR stands for "crystal rectifier" and is sometimes used.Clonkexhttps://www.blogger.com/profile/01090082045412254311noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-87249455202171108712022-03-23T16:17:36.034-07:002022-03-23T16:17:36.034-07:00In the schematic of the circuit, the diodes are la...In the schematic of the circuit, the diodes are labeled CR1 and CR2, but you refer to them a D1 and D2, correct? It made my brain stumble a bit when I first, and then I wondered why you didn't consistently use the same terminology as the (I think outdated) schematic, or at least a quick note explaining it. <br /><br />Is the CR# an older style schematic reference standard? The Q# for transistors and R# for resisters matches current (sorry!) standards, I think. <br /><br />John Shttps://www.blogger.com/profile/01934119151415487359noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-40061023886654939742022-03-23T00:53:55.148-07:002022-03-23T00:53:55.148-07:00This is really cool. I appreciate that you explain...This is really cool. I appreciate that you explain so well how they jumper signals across the silicon.Clonkexhttps://www.blogger.com/profile/01090082045412254311noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-73331706056746310742022-03-22T11:18:48.812-07:002022-03-22T11:18:48.812-07:00I love this.
I'd like to point out that the H...I love this.<br /><br />I'd like to point out that the HP-35 calculator, introduced in 1972, also employed dynamic shift register memory implemented in PMOS. HP designed a custom clock driver chip that's described in the HP patent, US 4,001,569, and is clearly explained in the late Jacques Laporte's excellent website here: https://archived.hpcalc.org/laporte/CLOCK-DRIVER.htm. I assume Steve Wozniak (the Apple-1's designer) would have known about that.<br /><br />Thanks for another fascinating deep dive into tech history.<br /><br />-RobRob Weinsteinhttps://www.blogger.com/profile/13227679420391779788noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-76965842835656905782022-03-21T14:50:06.470-07:002022-03-21T14:50:06.470-07:00Good history!!Good history!!herrmanso@gmail.comhttps://www.blogger.com/profile/01875177475626569680noreply@blogger.com