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Model Electronic Railway Group

The Leading Society for Model Railway Electronics

MERG DCC System - Downloads

Last updated 23 September 2019

These pages are a resource area for projects members are working on or have completed and wished to make publicly available. Some of these projects have resulted in MERG kits but nothing on these pages should be taken as definitive information about the kits, members should check the kit pages for up to date information on the kits.

The files in the matrix below provide the information needed to construct the MERG dcc system. For anyone having trouble downloading the source code .asm files they are included in .zip packages. (The .zip includes all files for the item concerned). For more general information on MERG DCC visit the main DCC page

Current MERG DCC system kits

CBUS Command Station (CANcmd) Kit 91

Full Zip File: Download
Parts List: CMD_parts.xls
15-Aug-10
Schematic: CANcmd_sch.pdf
15-Aug-10
PCB Layout: CANcmd_pcb.pdf
15-Aug-10
Component Layout: Image
Code: CANcmd_j.hex
15-Aug-10

CBUS Hand Controller (CANCAB) Kit 92

Full Zip File: Download
Parts List: CAB_Insts.pdf
Cab_parts.xls
15-Aug-10
Schematic: CAB1A_sch.pdf
15-Aug-10
PCB Layout: CAB1F_pcb.pdf
15-Aug-10
Component Layout: Image
Code: CAB1u.asm
15-Aug-10

New Booster (NB1B) Kit 59

Description: Description.pdf
23-Jan-11
Schematic: Schematic.pdf
23-Jan-11
PCB Layout: Layout.pdf
23-Jan-11
Component Layout: Image
17-Aug-07

Accessory Encoder (ACE) kit 51

Full Zip File: ace2b.zip
Parts List: ace2btxt.pdf
1-Apr-03
ace2parts.xls
1-Apr-03
Schematic: ace2bsch.pdf.
1-Apr-03
PCB Layout: ace2bpcb.pdf
1-Apr-03
Component Layout: Image.
Code: ace3a.asm
ace3a.hex
18-Jan-06

Accessory decoder (ACC2) Kit 52

Full Zip File: acc.zip
Parts List: acc2btxt.pdf
1-Apr-03
acc2parts.xls
1-Apr-03
acc5txt.pdf
6-Aug-05
Software description
27-Jan-04
Schematic: acc2bsch.pdf
1-Apr-03
PCB Layout: acc2bpcb.pdf
4-Jun-03
Component Layout: Image
Code: acc4.asm
acc4.hex
6-Aug-05
acc5.asm
acc5.hex
6-Aug-05
dbacc5.asm
dbacc5.hex
11-Nov-01

Accessory decoder for Tortoise etc. (ACC3) Kit 53

Schematic: acc3sch.pdf
13-Feb-03
PCB Layout: acc3pcb.pdf
13-Feb-03
Component Layout: Image
Code: See Kit 52

Other MERG DCC Projects

Items listed here are projects that have not been produced as kits as well as earlier kits that have been replaced by the current kits above.

Click here for original MERG DCC system overview PDF

Combined Command Station, Booster and Power Supply (BC1A)

Was Kit 42 - now discontinued

Full Zip File: bc1a.zip
Parts List: bc1adoc.pdf
6-Jan-01
bc1apart2.xls
12-Dec-02
Schematic: bc1asch-e.pdf
7-Apr-04
PCB Layout: bc1a-epcb.pdf
7-Apr-04
Code: bc1a_2.asm
11-Feb-06

bc1a_2.hex
23-Feb-06

Hand Controller - Mark 2

Was Kit 43

Full Zip File: hs2.zip
Parts List: Parts list
24-Feb-03
Schematic: Schematic.pdf
8-Jan-03
PCB Layout: hs2bpcb.pdf
hs2bcut.pdf
8-Jan-03
Code: hs2lbl1.pdf
hs2blay.pdf
8-Jan-03

New Booster - NB1A

Description: Description.pdf
12-Feb-09
Schematic: Schematic.pdf
11-May-10
PCB Layout: Layout.pdf
10-May-10
Component Layout: Picture.jpg
17-Aug-07

Original Command Station

Full Zip File: dcc8.zip
Parts List: dcc81.pdf
28-Nov-99
Schematic: dccstn8d.pdf
8-Jul-99
PCB Layout: dcc8stnu.pdf
22-Nov-99
Code: dcc8g.asm
dcc8g.hex
29-Feb-00

Booster (Boost5)

Full Zip File: booster.zip
Parts List: booster.pdf
7-Jul-99
Schematic: boost5g.pdf
7-Jul-99
b5pwrstg.pdf
7-Jul-99
PCB Layout: b5pcb.pdf.
7-Jul-99
boost5.pcb

Hand controller - Mark 1

Full Zip File: hsc.zip
Parts List: dcc8hscl.pdf
20-Jan-00
hsparts.xls 10-May-01
hsparts.htm 10-May-01
Schematic: dcc8hsd.pdf
29-Jan-01
PCB Layout: dcc8hsg3.pdf
29-Jan-01
hsspcb.pdf
8-Jul-99
dcc8hsg6.pcb
8-Aug-02
Component Layout: hslbl.pdf
hslblm3.pdf
20-Jan-00
hslblkn.gif
8-Aug-02

Accessory Encoder PC adapter board

Was MERG kit 54 (Discontinued)

Parts List: APC1_txt.pdf
18-Aug-08
Schematic: APC1_sch.pdf
10-Nov-05
PCB Layout: APC1_pcb.pdf
10-Nov-05
Code: Ace_PC1.asm
Ace_PC1.hex
18-Aug-08

Auto reverse and cutout module (ARC)

Full Zip File: arc.zip
Parts List: arc.pdf
26-Jan-02
arcparts.xls
31-Jan-02
Schematic: arc1sch.pdf
26-Jan-02
PCB Layout: arc1pcb.pdf
26-Jan-02
Code: arc1.asm
26-Jan-02
arc1.hex
26-Jan-02

Cutout module (BCO1)

Full Zip File: BCO1.zip
Description: Description.pdf
Schematic: Schematic.pdf
PCB Layout: Circuit board.pdf
Code: Hex file,
ASM file

Cut out and detection module (BDC1)

Description: Description.pdf
Schematic: Schematic.pdf
PCB Layout: Board.pdf
Component Layout: Picture.jpg

Block Occupancy Detector (BOD1)

Description: Description.pdf
Schematic: Schematic.pdf
PCB Layout: Board.pdf
Component Layout: Picture.jpg

Accessory decoder (ACC6)

Revised version for Fulgurex etc point motors

Parts List: ACC6_txt.pdf
04-Feb-07
Schematic: ACC6_sch.pdf
04-Feb-07
PCB Layout: ACC6_pcb.pdf
04-Feb-07
Code: Acc6_3.asm
23-Mar-07
Acc6_3.hex

Programmer

MERG kit 41 (Discontinued)

Full Zip File: prog.zip
Operating instructions: Operating instructions
7-Jan-07
Parts List: prognlb.pdf
15-Jul-99
progpa~1.pdf
12/12/02
Schematic: dccprog1.pdf
15-Jul-99
dccprog2.pdf
15-Jul-99
PCB Layout: progpcb.pdf 
22-Jul-99
prog.pcb
Other: Box label and cutting template
23-Jun-08
Code: for 16F84 (obsolete)
progg1H.asm
07-Jan-07
progg1H.hexfor 16F628A (current)
progg2K.asm
21-Sep-08
progg2K.hex

MERG DCC Locomotive Decoders

Most of these were produced as kits for a few years but needed very good soldering skills and the reducing price of commercial decoders removed the cost advantage. The dec12/13 series do give very good performance

Loco Decoder

Full Zip File: dec10-11.zip
Parts List: decoder2.pdf
26-Apr-00
make101.pdf
26-Apr-00
INTDEC10version103.pdf
3-Feb-01
software desription
27-Jan-04
Schematic: decod10b.pdf
3-Apr-00
PCB Layout: dec10bpc.pdf
7-Apr-00
Component Layout: dec10pc2.pdf
7-Apr-00
decod10 image
7-Apr-00
Code: decod10d.asm
decod10d.hex
8-Feb-01
mbint105.asm
mbint105.hex
27-Jan-04
16f628.asm
1-Apr-03

Small loco decoder

Full Zip File: dec10-11.zip
Parts List: As loco decoder above
Schematic: dec11sch.pdf
14-Jun-00
PCB Layout: dec11pcb.pdf
28-Apr-00
Component Layout: dec11pc2.pdf
20-Apr-00
decod11 image
20-Apr-00
Code: As loco decoder above

Small loco decoder with feedback and stealth

Full Zip File: dec12-13.zip
Parts List: dec131tx.pdf
9-May-02
dec131~1.pdf
10-Jan-03
Schematic: de12dsch.pdf
27-Apr-01
PCB Layout: de12dpcb.pdf
27-Apr-01
Component Layout: decod12 image
27-Apr-01
Code: dec133a.asm
dec133a.hex
14-Mar-03

Loco decoder with feedback and stealth

Full Zip File: dec12-13.zip
Parts List: As small loco decoder above
Schematic: decod13.pdf
10-May-01
PCB Layout: dec13pcb.pdf
10-May-01
Code:

Flash unit

Full Zip File: flash.zip
Parts List: flash.pdf
5-Feb-02
Schematic: flashsch.pdf
5-Feb-02
PCB Layout: flashpcb.pdf
5-Feb-02
Component Layout:
Code: flash12a.asm
17-May-02
flash12a.hex