Minimig Manufacture

Minimig

List of interest:

Name	Comment
Freqmax	depending on price/offer
..	..

Use headers rather than ports? (suggested by many)
Use PSRAM ..?

jkonstan (on SRAM 070729):

68AW512M ,an ST 512Kx16 SRAM in a 44 pin TSSOPII package, is no longer produced. We will have to substitue a Cypress (CY62157EV30LL-45ZSXI), ISSI (IS62WV51216BLL-55TI), or Renesas (HM62V16514LTTI-5) SRAM.

PCB can be manufactured by Olimex or Myro (does assembly aswell) or one of the other PCB Manufacturers.

Resources:

http://bazix.nl/onechipmsx.html Inspiration

Case design: solidworks, Maya, Rhino, Blender 3D, Wings 3D.

Case manufacture: http://www.protocase.com/ http://www.emachineshop.com/

CD32Freak (070730):

Make PCB's with a laser printer

Easy PCB Fabrication

Express fabrication of pcbs from gerber files

Nusim (070730):

Small run of original (Minimig ver. 1.0) bare PCBs.

The only change is the silk screen just to identify the source for quality control.

I stress that these are suitable only for the serious electronics dudes, experimenters and people interested in 1st wave prototypes. They will involve smd work and so are not for the faint hearted!

We are expecting them in next week. As soon as they arrive we will post a link to a paypal shopping cart.

Pricing will be;

£11 - Shipped U.K.

£13 - Shipped Europe (Airmail)

£15 - Shipped USA (Airmail)

We will also try to source the original ST memory and make those available as well.

Any profit will be donated to the TeamAros Kickstart II bounty!

Hans_ 070730:

Actually, it helps with both VCC dip/bounce and ground bounce as it provides a low-inductance path for transient currents on both sides. If you draw out the circuit schematic for a decoupling-capacitor connected to an IC, you'll see that it affects both VCC and ground.

A ground plane is still a good idea. You should be able to create a reasonable ground plane on a 2-layer board if you keep most signal lines on one side and keep any signal traces on the lower layer short.

basman74 070731:

For 100 off, My guess would be like this (prices are in USD) most prices were obtained from Digikey:

Per unit cost - Minimig Rev. 1.0

FPGA: $19.25

PIC: $5.15

PCB: $7.00

2 x SRAM: $14.50

68k CPU: $11.00

misc IC's: $1.80

MMC slot: $2.20

Connectors: $5.50

Headers: $0.50

Passive parts: $4.00

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Bare PCB: $7.00

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parts delivery: $3.00

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Subtotal: $80.90

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Assembly: $25.00(hand assembled?)

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Unit cost: $105.90

Deduct $32.00 from the above to give you your answer for parts cost minus PCB and assembly.

freqmax 070731:

gEDA electronic CAD (geda.seul.org)

useing a 1Mx16 ram one can free RAM_SEL1 by using RAM_SEL0 as additional address pin. And one sram instead of two saves a lot of wiring.

Crom00 070811:

http://www.fujiyama.cn/Company.asp

Shenzen China.. classic Nintendo 16,8bit,gameboy emulator,AVI,WMV,ebook,picture viewer & camera features, 1 gig ram, sd card slot, FM radio, usb2 with a TFT monitor, and TV output. .. Seems if larger numbers with a complete system are ever considered an outfit like this can do the job.

Used components store - rocelec.com (Troika 070731) digikey: PIC18LF252I/SP (RoHS)
Conrad - Inflated prices, small selection, messy website
Component store - RS-Components rswww.com
Component store - rs-components.com
Component store - Reichelt.de
Howto solder BGA with toaster oven (instructables.com)
Advanced & Expensive? BGA socket