The PCB

I routed a custom PCB which can be stuffed inside the S&S for embedded operation (but not inside the cartridge slot, which is way too small).

The PCB can be ordered on BatchPCB for $7.50.

Here are the manufacturing files: Layout for Proteus 7.2 and in 200 DPI PNGs.

The schematic is the one shown on this page.

(Real PCB pictures to come... )

Bill of materials:

• U1: 16 or 32kB Flash or (E)EPROM 16ko. 27C/29W128/256 in DIP28 (eBay), between $2 and $4
• U2: EPM3064ATC44 CPLD Farnell 1549417 3.08€
• U5: 1117CE33 3.3V LDO regulator Farnell 2057285 0.31€
• U4: L78L05ACZ 5V regulator Farnell1467763 0.124€
• U3: CD4093BM NAND with Schmitt trigger inputs Farnell 0.35€ (or MC74VHC1G14 in SOT353 Farnell 1353868 0.087€)
• Q1: BC817 transistor Farnell 2114873 0.025€
• C1: 10uF electrolytic capacitor 2.54mm
• C2, C3: 100nF capacitor 1206
• R1,R3,R5,R7,R9,R11,R13: 68k 1206
• R2,R4,R6,R8,R10,R12,R14: 27k 1206
• R15: 150 1206
• R16: 2.2k 1206
• R17: 10k 1206

The final cost is around $18 without shipping, and without the CPLD and flash programmer.