new batch of Mimeo’s on order

Next batch of Mimeo boards are now on order. I should be able to pick them up in about 3 weeks. Sorry for the delay, to those that I promised boards in September, but a lot has been going on here at Mimeo headquarters.

This order was delayed, because a couple of weeks ago, I decided to investigate the possibility of using a different supplier, that would be able to work with me a little bit more. Though Advanced Circuits does fantastic work, they are set up to produce boards in a standard way. Whenever I have asked for them to do something a little different, I really haven’t received much help, or have been asked to pay for custom service, which is often more than I can afford.

An example is the Datanetics keyboard PCBs that I had made a couple of years ago. Even though those boards have no solder mask or silkscreen layer, I had to pay standard price. Other “online” PCB fab places have similar policies.

Yesterday, I visited a local place that I placed the order with. They took about an hour to talk to me. They even took me on a complete tour of their facility. I was pretty impressed at the complexity of the process. Anyone familiar with etching PCBs at home, would hardly recognize what is going on in a real production facility. I know I hardly did.

Pricing was competitive. I’m taking a slight hit on a one time set up charge, but I think the personal service will be worth this one time cost.

Stay tuned for an update as we proceed through these uncharted waters.

Lucky Me

I never thought my interest in the early Apple Computers would result in this, but I have been mentioned or quoted in Make magazine, Computerworld and even a local edition of the Wall Street Journel

Now comes an awesome demonstration of a Mimeo by Evan Koblenz of MARCH at HOPE. This has just been published by the technology-related news website www.slashdot.org

Enough of the links – far more important to me than the press, is that I’ve become good friends with a wide range of super people with a similar interest in vintage computers. The people are the reason why I continue to invest so much time and energy in this hobby. Take away the people and I’m doing something else.

Mimeo update

If you are on my waiting list for Mimeo kits, I should be contacting you in the next few days about PCBs. If you have been waiting for more than a month or two, feel free to remind me about your interest. PCBs will go first to those that have been on the waiting list the longest. The folks at Unicorn Electronics believe that they will have parts kits available as soon as next week. If you are waiting for assembled systems you will have to wait a while longer. I’m planning on doing enclosures this time and everything will take considerable time and effort to put together. I’m up to my ears in ongoing stuff, right now.

New pricing and basic ordering information is posted on my Mimeo page:

http://www.willegal.net/appleii/apple1-kit.htm

Reminder – I will be supplying only PCBs (motherboard and monitor PROMs) – other parts for a complete motherboard kit should be obtained from Unicorn Electronics.

For the smaller kits, like the Brain Board, ACI and PS/2 adapter, I’m still supplying the entire kit.

Great Mimeo Kit News – Kits available soon

PCBS

The batch of boards I purchased last month were all sold as bare boards, so I’m getting a new batch made up. More than half of those boards went to a company in Los Angeles which turned them into non-functional props for the new Steve Jobs movie starring Aston Kutcher. I’m expecting that that movie will feature some cool looking props, when it comes out.

Anyway the new batch of PCBs will take a couple of weeks to arrive.

Kits

I’m excited to announce that there will be some changes for those of you that wish to purchase Mimeo kits. I’ll be selling boards to you and parts kits will be purchased directly from Unicorn Electronics. I’ve sent BOM information to Rob at Unicorn, who is working hard to get all the required parts. Rob tells me that he has most parts on hand, already, but there are a few more to gather. I am really excited about this arrangement, as it should greatly increase the availability of Mimeo’s to the vintage computer hobbyist and free up time for me to work on new projects – a win for everyone. People wanting to build kits would have to take a couple of extra steps to get their kits. I think that this is a small price to pay for increased availability.

Mimeo Assembly Manuals
For hard copy assembly manuals, I’ll probably make it a separate, extra cost option, though I’m also considering using a print on demand service, so you would have to order the manual separately.

Assembled Mimeos
For those of you who want a built up Mimeo, I’m looking into building a few complete systems, with keyboard, enclosure and cassette player. Be forewarned, this sort of system will take a lot of time and money to put together. I haven’t set a price, but the number I have in mind will put it into the luxury item category.

Apple II rev 0 PCBS?
Ordering and putting together kits for Mimeo has been a huge time sink, and this change will allow me more time to work on new projects. If it works out well, I’ll also seriously consider making a new run of Apple II rev 0, reproduction motherboards. Unicorn would become the default parts supplier for that kit, as well.

Simpler Kits
For simpler kits, like the ACI, PS/2 adapter and Brainboard, I will continue to supply the complete kit, just like before.

Vince Briel evaluating doing a cassette interface card

Check out the post on his forum. I think all replica 1 owners should get a cassette interface for their units. Using an ACI is pretty essential to a faithful Apple 1 experience. Back in the the old days, it was…

  • the only Apple 1 expansion card ever offered by Apple.
  • the only way to share software between Apple 1 owners
  • Owners of original Apple 1’s or clones like my Mimeo or the Obtronix understand that without a Cassette interface, an Apple 1 Computer is nearly useless.

    Cassette interface technology can be challenging. Note that Vince’s unit is most likely to incorporate several design features that I first documented either on my web site, or on Applefritter.

  • input coupling cap change to .1UF- see my ACI page
  • referencing voltage comparator to ground instead of -12 volts: see the applefritter post
  • If you can’t wait for Vince to make an ACI board, I have authentic reproducion ACI kits in stock and ready to ship for $75. Drop me an email at mike@willegal.net

    Interesting Brain Board remote switch

    Corey Cohen came up with this easy method of creating a remote switch panel for the Brain Board. Here is an image of his prototype version. Knowing Corey, I’m sure that his final version will be mounted on a nice plexi panel.

    Brain Board Remote Switch Thingy

    Brain Board Remote Switch Thingy

    One DPDT switch controls which bank on the brain board is selected. Corey has loaded integer basic and the original monitor onto his second bank. The other SPST switch controls whether brain board or motherboard roms are selected after reset – this second switch is essentially the same as the firmware board toggle switch.

    One wire needs to be added to the back of brain board to connect Apples reset to the DIP socket at pin 2. Reset can be picked up from the onboard switch location. It is the center of the three holes.

    A ribbon cable is used to connect the remote switch box to the Brain Board. As you long as you stay within reason, longer ribbon cables than pictured should pose no issues. The only active signal is reset, which, when asserted, is held low for relatively long periods of time.

    Brain Board Remote Switch Setup

    Brain Board Remote Switch Setup

    Howard Cantin interview – Woz’s reaction

    See my earlier post describing my interview with Howard Cantin.

    I sent the excerpts of this interview to Woz to get his impressions. Woz was happy to see the interview and responded with some interesting comments. My email is indented and in gray, Woz’s response is not. This is published in my blog with Woz’s permission.

    On Apr 17, 2012, at 9:27 AM, mwillega wrote:

    Hi Steve,

    A couple of weeks ago I had a telephone conversation with Howard Cantin. Howard is known as the PCB layout person on the Apple 1. Apparently he was also involved in the first Apple 2 layout. A few of the things he said, are quite different than what I have heard and read elsewhere. I’d be interested to know what you thought of what Howard told me.

    My comments below.

    THANK YOU THANK YOU THANK YOU. It’s rare to find the true stories from back then.

    What follows are taken from notes taken during the call with Howard. The call was not recorded, so words are mine.

    Background
    Howard worked from his house for clients including Atari and Apple. Howard says he laid out all the boards for the first four years at Atari, until Nolan Bushnel sold the business. He also laid out first boards of other electronics startups in valley that became major players. Though he couldn’t remember the names of others, he says he did the first PCB for Intel. Howard says he was well connected to insiders in the valley electronics community and was the person to go to, when a PCB layout was needed. Howard related how he set many of the standards in PCB layout that were followed by others.

    Nolan Bushnell of Atari was often in a hurry and pushed Howard to hurry along a design. Howard says he was a fast designer, partly because of working under the pressure provided by Nolan. He could add a chip to a layout in hour.

    Steve Wozniak
    Regarding Steve Wozinak, Howard related to me, the often retold story about how Woz created a game design that used 60 parts instead of the 100 in the design that preceded it. Howard related that engineers at Atari couldn’t understand the design. Because they couldn’t understand it, Atari ended up not using it.

    How Howard Worked
    Most designs had an edge connector, so he would start with that and then add parts that connected to the edge connector. Then he would connect those parts to the parts that connected to those parts and so on. Vias were expensive and to be avoided, and would take up the space need for 3 traces. Howard provided his original artwork and photographic transparencies ready for the PCB manufacturer to his clients. Howard often didn’t negotiate price before taking on a job, but a typical cost was 6 to 8 dollars per chip. Howard worked directly from customers schematics, and is still proud of his ability to produce a result that matched the schematic perfectly.

    The Hobby Computer
    The first board that Howard did for Jobs and Wozniak was a computer to be sold to the hobbyists at the local computer club. Howard says that this computer was the board that provided the financing to start Apple Computer. Howard refers to this as a hobby computer, not an Apple Computer. Howard says the two Steve’s always were together and they conducted their discussions with him together. To pay for this computer, the Steve’s tried to trade an old Fiat Station Wagon for services rendered. Howard asked for cash, so the Fiat was sold and proceeds used to pay Howard. As some point, stock was offered, but this was also refused.

    The First Apple Computer
    Steve Jobs appeared to be a perfectionist to Howard. During the layout of the first Apple Computer, Howard had three proposed layouts with different form factors. There apparently was a lot of back and forth figuring out the form factor. Finally, Howard suggested one of the layouts happened to exactly match the size of a piece of legal paper (8.5×14) and Jobs selected that one. The proto area in the corner of this computer was empty and it was Howard’s idea to put pads for a chip and an array of pads that became the proto area.

    Though Howard did the main chip placement on this second layout, Howard paid a woman to lay the tape for traces. She was not very good and the traces she laid were not very straight. Jobs wasn’t satisfied and took the design and had it redone digitally. Jobs later told Howard that this re-layout cost Apple three months. Howard asked Steve why he needed to redo the layout and Steve said he was only going to do it once in his life.

    Howard did not use that woman for laying traces again. Howard told me that after that project, that he would have refused more work from Apple. In any case, Apple didn’t come back to him.

    PIRACY
    Howard also mentioned that he thought that the one of the Steve’s took a picture of an Atari board that he happened to be working on as the same time he was working for them. He thought that the Steve’s might have used this picture to duplicate an Atari design in some way. Howard did not have any specific details about what exactly was done with the image. Howard also said he talked on the phone with someone in England that might have been investigating another pirated Atari design. At one point, Nolan Bushnel asked Howard to pirate another design, but Howard refused. Howard now thinks that this was Nolan’s way of checking Howard’s honesty.

    Anyway I have these comments about what Howard said. I’d be interested in what feedback you had.

    He is confused about the “Hobby” computer that was the Apple 1 and the “first Apple Computer” that was the Apple II.

    When we met Howard at his home in Scotts Valley (I believe that’s where) we had not yet come up with the name Apple.

    Howard’s story says the vehicle sold to finance the Apple 1 was a Fiat Station Wagon, not a Volkswagon bus.

    It could be. It was some vehicle that really wasn’t being used as I recall. All I know is that I sold my most valuable possession, my HP-65 calculator, to come up with my half. Steve and I always did everything in business 50/50 (with regard to money).

    Do you remember taking the Apple II layout that was done by Howard’s subcontractor and then reworking it in a digital format?

    This does match my recollection, although the steps and reasoning for the switch to computer layout I wasn’t close enough to. I saw it being done but I don’t recall a negative reasoning, just that computer layout was ‘better’.

    Finally, his story of Steve Jobs and you somehow stealing an image of a Atari PCB and making some kind of profit from it. He was very vague about exactly what was done. That part of Howard’s story seems incredibly unlikely to me, especially given the inconsistantcies with the rest of the story.

    I would never do such a thing. I never photographed any Atari board nor remember it being done while I was around, but it’s possible that Steve Jobs did photograph one at some other time. I’m against stealing designs. Look at my designs, for example. You won’t find a bit of them extracted from some other design or data sheet. Check out almost every other hobby computer design around then and that’s all they were, duplicates of Intel data sheets. My design was always so original that it’s partly why Atari couldn’t understand it (Breakout).

    This story rings incredibly true and accurate, which is unusual in our business. Obviously it’s first hand from Howard and not filtered through communications types in companies or the media.

    Thank you for letting me know I’m not going crazy with all the things others have reported on these matters.

    — Woz

    Thanks and best regards,
    Mike W.

    Continue reading

    Who built the Apple 1 – part 2

    Previously, Woz indicated in an email to me, that a contract manufacturer flow soldered and stuffed the Apple 1. I reported this earlier, in this blog. First of all, there is and can be no confusion about the fact that the boards were flow soldered at a contract manufacturer. The characteristics of the solder work on the existing boards, proves this. Now onto the new information.

    Dan Kottke at VCF east revealed some information that partly clarifies the confusion between published accounts, Woz’s email and physical evidence.

    Dan indicated that, at one point, he entered the house after coming back from the east and Patty was busy stuffing boards. Dan also indicated that WOZ visited the house only once every two weeks or so. Given the information that Dan was at the house testing boards many days, for 2 hour stretches, and WOZ was there infrequently, I accept Dan’s report of Patty stuffing at least some boards.

    So what we know is that the boards were flow soldered by contract manufacturer, and at least some were stuffed by Patty. Dan did the testing and any repairs. The question remains, is if all the batches were stuffed by Patty or if some were stuffed by the contract manufacturer. Dan K. may have the answer for that and I plan on contacting him about it.

    Convert a Virtual II “tape” to load into a real Apple II

    If you use the program Virtual II, you may know that it reads and writes to a virtual tape. Files written by Virtual II can be easily moved to an iPod and read on real Apple IIs. Here is the process I use.

    1) Save the “tape” to a file using Virtual II’s normal tape saving process. This file is in AIF format, but volume probably needs to be increased in order to be read by a real Apple II from an Ipod type music player.

    2) Rename the file to a .aif suffix from the .cass that Virtual II normally uses.

    3) Covert the AIFF file to 16bit 41.1 kHz sampling rate and size. This can easily be done by loading the file into Quicktime PRO and using the export command to convert it.

    4) Now the AIF file can be dragged into a GarageBand track. Add 6dB volume to the track and optionally cut out any unnecessary silence at the beginning of the recording.

    5) Finally export to itunes and sync to your ipod.

    6) Play back to your Apple II at maximum volume and you should be able to read your Virtual II generated tape.

    The same process can be used to generate audio files for the Apple 1, using the Wozanium Pack ROM image loaded into Virtual II. However, you may not need to increase volume for real Apple 1’s or clones as they don’t seem to need as much volume as the Apple II.

    Prototype Protoboard working

    I use a GAL to reduce part count in this design. I’ve had a terrible time programming the GAL with a vintage Data I/O 29B and finally gave up and bought a cheap chinese programmer that seems to work better.

    Prototype Prototype with LED on

    After a few tweaks, especially surrounding the difficult timing on the 6522 VIA, I have the prototype up and running and even blinking a LED. I found an Apple tech note about interfacing to the 6522 that I decided to follow exactly. I had one other issue with handling the release of the selection of the C800-CFFF ram space. Some of the schematics I found online, use some inverters and a cap to slow down response to releasing the selection, presumably to ignore glitches. I found that using the same delayed clock to condition this signal as is used by the 6522 interface, seems to work as well.

    I implemented the PROM on this device with an EEPROM and I have been able to write some small test programs and save them in EEPROM without any need for a prom programmer. I think experimenters are going to love this feature. I wish I had done this on the Brain Board, but I didn’t think of it at the time.

    For Apple 1 lovers, note that I did a quick checkout in a Brain Board/Wozanium environment this morning and had no issues.

    I have lots of ideas for projects and it will be easy to connect it to a solderless breadboard for quck and easy prototyping. Besides use for experienced hackers, I want to make this a tool for people who want to learn fundamentals of computer interfacing and hope I can find time to do a series of introductory projects. What it ends up doing, besides blinking a LED, and the projects I come up with, is up to the creative people in the Apple II community.

    I’ll definitely bring the prototype to TCF east next month. I’ll have to figure out how much more testing is required before ordering a batch of boards. I’ll definitely try it in my IIe, but what else I run it in remains to be seen. The PCB layout has been tracking changes made in the prototype, so once I decide I have a good final design, it will not take long to get the boards made.