BUILD.txt

 ** 6809v2 SBC Assembly instructions **

Parts needed:

#	Part
--	--IC's--
1	63c09E cpu	dip40
1	68681  duart	dip40
1	128k-512k sram	dip32*
1	2764 eprom	dip28
1	74ls10		dip14
1	74ls00		dip14
1	74ls32		dip14
1	74ls133		dip16
1	74lxc244	sop20
2	max232		dip16
1	14.750mhz oscillator
1	3.3v LDO	TO220 or SOT-83

--	--discretes--
13	.1uf decoupling caps
9	1uf  electrolytic caps
1	10uf electrolytic cap
1	51kohm [513] 1206 resistor
1	51 ohm [510] 1206 resistor
1	10k (brown black red) resistor
1	100k (brown black yellow) resistor
1	1n4148 diode
1	6mm push switch
1	LED

--	--ports--
2	solder-cup DB9 male jack
1	wurth 693072010801 (or similar) micro-sd slot
1	micro-b usb jack (optional if barrel jack is fitted, power inlet only)
1	2.5mm barrel jack(optional if usb is fitted)
1	2-pin header

--	--IC sockets (optional)--
1	dip28 .600
1	dip32 .600
2	dip40 .600
4	dip14 .300
3	dip16 .300
1	crystal socket**

* A 512k sram may be fitted, but the board lacks hardware to effectively map more than 256k.  A jumper under the ram socket connects A18 to ground.
** Oscillator cans don't tend to stick well in DIP sockets.  It's recommended to either have a specific socket type or solder the oscillator to the board.

Assembly:
If your board is from VCFMW 13, it's likely that all SMT components are already mounted.  Bare-board purchases may not be this way.

Mount the surface mount components first.  The surrounding components will interfere with soldering later.
* The 74lxc244 may be mounted before the USB jack to aid in drag soldering.

Mount the chip sockets if provided

Mount the oscillator (X1)

Mount the discrete components:
 Value	location(s)
 10uf	C22 (unmarked, near barrel jack )
 1uf	c6 (reset circuit)
 1uf	c18,c19,c20,c21 (near u11)
 1uf	c1,c2,c3,c4 (near u6)
 .1uf	C5 (reset circuit) and near all IC's
 100k	R1 (reset circuit)
  10k	R3 (between CPU and DUART)
 Switch	SW1 (reset circuit)
 diode	D1  (reset circuit)
 3.3v	U8 (near power jack) or U13 (bottom of pcb): Fit one only!