I need someone to make two (relatively simple) schematics for me. One is the IBM card for the Lego kit, and one is the Lego interface box. Here is one side of the IBM card: http://snarc.net/lego_ibm_1.jpg Here is the other side: http://snarc.net/lego_ibm_2.jpg Here's a picture of the top of the interface board: http://4.bp.blogspot.com/-DGOlTkGXj_Q/U8-T2uBG5iI/AAAAAAAAATY/7ra6gVkSKg8/s1... Here's the bottom of the interface board: http://lukazi.blogspot.com/2014/07/lego-legos-first-programmable-product.htm... Here's a document Dan R. made of the board a year or two ago: http://snarc.net/9750.png Now here is the catch..... I absolutely MUST have a complete, perfect, finished schematic of the IBM card and the interface board by a week before Maker Faire -- so let's say the deadline is Friday, Sept. 14. There is no room for delay. I don't know enough about schematic-making to know if you can do it based on the above links or if you need the parts in your hand. If it's the latter, then you would need to make an appointment with me to come to the museum and do the work there. I am reluctant to mail the parts out, because I need to work with them and because if there's a delay then I have a huge problem. Who can do this? There's no pay, only glory. :) Someone already made a schematic of the Apple II card: http://lukazi.blogspot.com/2014/07/lego-legos-first-programmable-product.htm...
On 8/29/2018 1:15 AM, Evan Koblentz via vcf-midatlantic wrote:
I need someone to make two (relatively simple) schematics for me. One is the IBM card for the Lego kit, and one is the Lego interface box.
Here is one side of the IBM card: http://snarc.net/lego_ibm_1.jpg
Here is the other side: http://snarc.net/lego_ibm_2.jpg
Here's a picture of the top of the interface board: http://4.bp.blogspot.com/-DGOlTkGXj_Q/U8-T2uBG5iI/AAAAAAAAATY/7ra6gVkSKg8/s1...
Here's the bottom of the interface board: http://lukazi.blogspot.com/2014/07/lego-legos-first-programmable-product.htm...
Here's a document Dan R. made of the board a year or two ago: http://snarc.net/9750.png
Now here is the catch..... I absolutely MUST have a complete, perfect, finished schematic of the IBM card and the interface board by a week before Maker Faire -- so let's say the deadline is Friday, Sept. 14.
Do you have a backup plan? I say that because I professionally feel that creating a working and tested schematic within your timeline is going to be nearly impossible. * The first board is two sided, and those typically need to be unsoldered to ensure all traces under the ICs have been mapped. One can try to use a multi-meter, but there are pitfalls * Even if the schematic is doable, there's no way to truly ensure it's perfect unless one make a spin of the PCB, populates it, and tests it. unless one wants to spend $250.00, it takes about 2 weeks to spin a PCB. * Though the other board looks to be single sided, all of the items on the board must be described and validated. The toroids in the center and right seem particularly problematic, as one needs to determine the uH, turns, and such of the items in order to be perfect. As well, those TO-220 transistors (or maybe they are FETs) sandwiched in between the connectors need to be desoldered or somehow moved so the markings can be read. The LEDs need to be scoped to determine their mA rating, etc. I'm not trying to rain on the parade, but I do want to inject some realism into the request timeline. Doing such a reverse engineer will probably take a month or so, assuming someone squeezes it into their normal workflow and they do this regularly. Someone already made a schematic of the Apple II card:
http://lukazi.blogspot.com/2014/07/lego-legos-first-programmable-product.htm...
Regrettably, it looks like the Apple uses a different schematic completely (It uses a VIA instead of the IBM PC discrete TTL) and so this schematic will not help. Jim -- RETRO Innovations, Contemporary Gear for Classic Systems www.go4retro.com store.go4retro.com
participants (2)
-
Evan Koblentz -
RETRO Innovations