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ECB Prototyping Board with I/O decode - ordering new boards [message #89] Thu, 26 November 2015 02:40 Go to next message
ewout is currently offline  ewout
Messages: 30
Registered: October 2015
Member
EDIT:
John has designed a new v3 Prototype board.
https://www.retrobrewcomputers.org/forum/index.php?t=msg& ;amp ;th=132&start=0&

{I want to start a new batch run of the 'ECB Prototyping Board with I/O decode' as nobody is listed anymore for that board. If anyone is also interested please let me know in this thread.
Maybe if someone has a preference for the 'ECB C'T Protoboard' please also let me know here. Personally I find the header exposure of the ECB bus lines on the Proto w/IO board a big advantage if I want to do some on board testing with logic analyzers.

Planning to order the boards at Eurocircuits as I have a student discount for small prototype batches though my university. The board will be send from Europe.

According to the board calculator, a eurocard format board (100mm x 160mm) with 2 layers cost €10.08 with an 30 boards batch, with 40 €8.26 and 50 €7.44. Excluding the postage costs of course Smile. 50 boards brings it on a total of €372~ which I want to consider if enough people get in on it.
The final costs will probably be the same as they take a very complex design as an example.

Current total: 18+ boards
5 myself
5+ Sarah
2 Andrew B
2 computronik
2 crusader49
2 inerlogic

Inventory left: 22}

[Updated on: Sun, 19 February 2017 02:38]

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Re: ECB Prototyping Board with I/O decode - ordering new boards [message #91 is a reply to message #89] Thu, 26 November 2015 07:10 Go to previous messageGo to next message
sarah is currently offline  sarah
Messages: 15
Registered: October 2015
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ewout has me down for at least five of the "ECB Prototyping with I/O decode" boards. I hope we can get enough support together for this order; once I get all my ECB boards assembled I'm going to be ready to do some prototyping!
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #92 is a reply to message #91] Thu, 26 November 2015 11:02 Go to previous messageGo to next message
Andrew B is currently offline  Andrew B
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Registered: October 2015
Location: Hawthorne, CA
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How much would shipping to the US cost? Zip code 90250.

If the shipping isn't too much, I'd be interested in 2 of the prototyping boards so I can work on my "Memory Mapped Propeller Video".

Also - in the past we have split the shipping on some orders up, and had all the boards for US people sent to one person in the US and then re-distributed them from there to save on $$$ for everyone. I'd be willing to help with that if there are enough of us in the US who are interested.
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #94 is a reply to message #92] Thu, 26 November 2015 11:40 Go to previous messageGo to next message
ewout is currently offline  ewout
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Registered: October 2015
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From my local post office to US I have 3 options:
Package with max size 100x50x50 cm and weight 2kg.
-Without track&trace: €18 =~ $19,09
-With track&trace: €24,30 =~ $25,78
-With insurance (<€500) and track&trace: €25,95 =~ $27,53

If we do the redistribution in the US, the insurance option would be my preference.
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #99 is a reply to message #94] Sun, 29 November 2015 05:22 Go to previous messageGo to next message
computronik is currently offline  computronik
Messages: 5
Registered: October 2015
Location: Spain
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Hello, I would like to build two of these new pcb´s.

Thank you .
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #272 is a reply to message #99] Fri, 15 January 2016 02:21 Go to previous messageGo to next message
ewout is currently offline  ewout
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Registered: October 2015
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Hi all,
I will order 40 boards end of January, so there will be at least 20+ boards left for future requests.
For everyone listed and who ordered early, the price is €8.26 per PCB (ex. mail).

@Andrew
Do you have a idea how many boards you would like for later orders in the US/Canada and re-distribution?

[Updated on: Fri, 15 January 2016 02:27]

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Re: ECB Prototyping Board with I/O decode - ordering new boards [message #559 is a reply to message #272] Sun, 24 April 2016 08:13 Go to previous messageGo to next message
crusader49 is currently offline  crusader49
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Registered: April 2016
Location: The netherlands
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Are there any boards left? I would like to build 2 of them.
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #561 is a reply to message #559] Sun, 24 April 2016 09:51 Go to previous messageGo to next message
jcoffman is currently offline  jcoffman
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Registered: October 2015
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Caution: if the prototyping board has not been re-ordered, then there is a circuit update needed.

Currently the board will select on IORQ# at a range of 16 selected device codes. For the Z80, this is incorrect. I/O requests are identified not by IORQ# low, but by the combination IORQ# low and M1# high. In an interrupt environment, the Z80 Interrupt Acknowledge operation is identified by IORQ# low and M1# low. Hence, if only IORQ# low is identified, spurious I/O selects can occur on an Interrupt Acknowledge request.

AFAIK, all RetroBrew I/O boards get this I/O qualification correct. The prototyping board should get it right, too.

Since the Z80/Z180 SBC's do not operate in an interrupt environment, this is not an issue. It could be an issue with CPU boards which do operate with interrupts enabled: SBC-188, Mini-M68k, and KISS-68030.

If the board has been re-ordered already, I wouldn't sweat the issue. I've use the old board for successful prototyping on two occasions. The circuit modification can be done as part of the prototype. Just be aware of the oversight.

--John


Re: ECB Prototyping Board with I/O decode - ordering new boards [message #618 is a reply to message #561] Tue, 03 May 2016 20:34 Go to previous messageGo to next message
inerlogic is currently offline  inerlogic
Messages: 2
Registered: October 2015
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i missed this post on the first go-round, otherwise i would've jumped on the pre-order, if there are any left i would like 2 boards, shipping would be to the US, 02719 is the zip. just need the payment details Smile
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #841 is a reply to message #618] Wed, 22 June 2016 10:07 Go to previous messageGo to next message
ewout is currently offline  ewout
Messages: 30
Registered: October 2015
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Hi all,

my graduation did eat up more of my time as I initially thought. The boards still need to be ordered so I can include the circuit update if wanted.
John could you specify me the changes needed for the update?
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #924 is a reply to message #841] Sun, 10 July 2016 14:23 Go to previous messageGo to next message
jcoffman is currently offline  jcoffman
Messages: 326
Registered: October 2015
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Ewout,

Any update on the status of the Prototyping boards? I sent you Kicad files on about 6/25, but have not heard from you. Status?

--John
Re: ECB Prototyping Board with I/O decode - ordering new boards [message #1684 is a reply to message #89] Sun, 19 February 2017 03:56 Go to previous message
ewout is currently offline  ewout
Messages: 30
Registered: October 2015
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I would like to apologize for the confusing I caused. Due to my graduation project taking more time than I first assumed it would, I couldn't continue working on the proposed new version that John send me months ago.

John has designed a new v3 Prototype board. If you would like to order this board please go to the following new topic:
https://www.retrobrewcomputers.org/forum/index.php?t=msg& ; ;amp ;th=132&start=0&
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