[Coco] CocoMIDI and Other Boards Available

Jayeson Lee-Steere cocolistemail at titaniumstudios.com
Sat Aug 20 00:52:32 EDT 2016

Quick note about the rev 1.0 boards since it has come up. I would not avoid
the 1.0 boards over a rev 1.1 board unless you find the patch wires
unsightly. The 1.0 boards circuit is identical to the 1.1 boards. If I were
selling the boards fitted in a case, I wouldn't even bring the issue up.

Patch wires are common in electronics, including a number of Coco
revisions. They aren't typically attached as robustly as they are on this
board. This is the "A" PAL Coco 2 board for example (photo by Daniel Campos
of his Misedo):


- Jayeson

On Fri, Aug 19, 2016 at 9:55 AM, Jayeson Lee-Steere <
cocolistemail at titaniumstudios.com> wrote:

> All of the rev 1.1 MIDI boards I have on hand have been spoken for. I'll
> order more today but it will be at least two weeks before I have them
> built.
> I do still have one rev 1.1 board with tin edge connector on one side. The
> gold plate was missing from this area. US$59 with the 6850 UART.
> I also have fourteen rev 1.0 boards with the patch wires on the underside.
> I don't have any functionality or reliability concerns with these and the
> patches won't be be visible once in a case. US$74 with the 6850 UART.
> - Jayeson
> On Thu, Aug 18, 2016 at 5:26 PM, Jayeson Lee-Steere <cocolistemail@
> titaniumstudios.com> wrote:
>> For those not on Facebook:
>> CocoMIDI 2016 boards are finally available! These follow the de facto
>> Coco MIDI standard used by the original Rulaford, Glenside, etc. MIDI
>> cartridges. They ended up being more expensive to build than my initial
>> estimates. There are a few options available.
>> John Strong is designing a case - current work-in-progress is looking
>> great. Please purchase case(s) directly from him when available.
>> I also have the pictured Coco 1 E-Board Solderless 64k Circuit boards.
>> These allow the Coco 1 E board machines to address the full 64k. Previously
>> this involved soldering an (IMO) ugly mess wires. You still need to supply
>> 8 4164 DRAM chips. The color of the attached jumper wire varies - if you
>> have a prefer please request a color and I will try to accommodate.
>> I may be able to ship the Coco 2 SRAM boards right now, subject to
>> testing this updated board design. These 64k boards are for later Coco 2
>> models which have the two white header sockets for a RAM board. The board
>> does not require any soldering but a single wire jumper does need to be
>> soldered onto the Coco main board. A pre-shaped wire jumper and a short
>> length of solder included. You'll need tweezers/fine tipped pliers, a
>> soldering iron and a helping hand to solder the jumper.
>> Pricing follows. All prices are in US$. If you are in Australia, I will
>> convert to AU$ and add GST. Some options are very limited quantities -
>> Michael Brant​, Randy Weaver​, Ed Orbea​, Anthony Mori​ and André Ballista​
>> are first in line. Please message me for a total - I check for message
>> requests often. Payment will be via Paypal.
>> Fully assembled and tested CocoMIDI 2016 rev 1.1 board with standard 6850
>> UART.  (Boards on left of first photo). Ignore the unpopulated chip sockets
>> on some of the boards in the photos - all board options come complete and
>> tested. As mentioned above, no case is supplied. $79
>> Fully assembled and tested CocoMIDI 2016 rev 1.0 board with standard 6850
>> UART. (Board on bottom right of first photo, and in second photo). This
>> earlier board revision has a number of patches on the bottom side. The wire
>> patches are soldered into the board through-holes, so are very solid. These
>> are functionally identical to the rev 1.1 boards, other than the lack of a
>> front set of mounting holes. I'm not sure John Strong's case will even use
>> these holes. $74.
>> Upgrade UART to 68B50. The 68B50 are rated for 2MHz operation so Coco 3
>> users may wish to choose this option. I am uncertain if any Coco MIDI
>> software accesses the MIDI port with the Coco running at 2MHz - there is no
>> need in assembly language and the earlier MIDI devices do not specify a
>> 2MHz part. If you plan on writing a BASIC MIDI program on your Coco 2, then
>> this option will allow you to use the high speed poke with confidence. Add
>> $9. Fourteen only, then they are gone.
>> Upgrade UART to new-old-stock, ceramic/gold, Soviet 6850 clone. Add $19.
>> Two only, then they are gone. I quite like these, so grab them quick before
>> I change my mind about selling them.
>> Buy two or more CocoMIDI 2016 boards at once. Save $10 per board.
>> E-board 64k Circuit board. $15
>> 64k SRAM board for late model Coco 2: $18
>> Postage is from Australia. As an example, postage and packaging to the
>> USA starts at $13.50 and typically delivers within 2 weeks.
>> Please note that the boards are hand-assembled in small quantities and
>> may have minor cosmetic flaws. If you are unsatisfied for any reason, send
>> back  boards within 15 days of receipt for a full refund (less shipping).
>> Cheers,
>> Jayeson
>> https://drive.google.com/file/d/0B_lZwDmP8D1aZjJEczNCQ2JmbkU
>> /view?usp=sharing
>> https://drive.google.com/file/d/0B_lZwDmP8D1aMmxDdmNZYUJFS2M
>> /view?usp=sharing

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