2 layers213.4 × 130.8 mm
Issue 4
iansbremner/ZX-Spectrum-Issue-4B-KiCAD
Recreation of the ZX Spectrum Issue 4B board in KiCAD
199 parts22
2 layers214 × 130 mm
ZX Spectrum 48K Issue 6A
- Size
- 214 × 130 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 218
- Nets
- 174
- Pads
- 919
- Tracks, vias
- 6,507, 416
- Pours
- 54
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 21 Oct 2026
- Updated
- 27 Oct 2026
Overview
Issue6A is an open-source printed circuit board by liveboxandy, from the liveboxandy/ZX-Spectrum-48K-Issue-6A repository on GitHub, published under the CC0-1.0 licence. It is a 2-layer board of 214 × 130 mm with 218 parts on 174 nets, routed with 6,507 tracks and 416 vias.
It is built around the BC184. Its parts include 80 resistors, 62 capacitors, 19 ICs, 15 diodes and 4 connectors.
Main components
1README
README.mdThis Kicad 10 project and was only used to create an ibom with tracks to assist in the debugging of faulty boards. While the routing should be correct, the track widths have not been followed exactly, nor have component tolerances. Use at your own risk.
The ZX Spectrum Issue 6A PCB used for this has an MFG date of 8443, a silkscreen FAB revision of SRC168, a topside FAB revision of SRC166 and a solder side FAB revision of SRC167.
The created schematic was based on the physical layout of the PCB and appears to show the DC-DC circuit from a revision 4A PCB where capacitor C79 is before R79 and D19 is after R79 on the -5V line. which is not the same as the schematics available around the web show.
Note that R32 is fitted as a 0R link on this PCB.
Resistor and capacitor values in the schematic are taken from the Service Manual Revision 1.3 that was edited by Brendan Alford and appear to differ in various locations compared to various available schematics. Where they differed I have used the values from the PCB I was given by HappyLittleDiodes(Jim).
For the Ferranti ULA, do not fit R90, C100, C102, C103 and leave LK1, LK2, LK3 and LK4 open.
On the PCB I received, LKU and LKV were also open.
On the board I received,
C30 22nF Not Required for Saga ULA
C32 100nF Not Required for Saga
C35 100nF Not Required for Saga, Saga 10nF
C52/C53 150pF Not Required for Saga
C67 100pF Not Required for Saga
C68-C71 100nF Not Required for Saga
C76 22nF Not Required for Saga
C100 Not Fitted. For VHF 10nF
C101 Not Fitted. For VHF 22nF
C102 Not Fitted
C103 Not Fitted
R17-R23 470R Issue 5 Only?
R24 1K If TR3 is KSC839 should be 15K
R33 680R For Saga 560R
R34 15R 0.5/1W
R48 2K2 Not Required for Saga
R49 10K Not Required for Saga
R50 4K7 Not Required for Saga
R51 2K2 For Saga 1K2
R56 1K Not Required for Saga
R63 1K Not Required for Saga
R65-R67 10K Not Required for Saga
R68 6K8 Not Required for Saga
R69 10K Not Required for Saga
R73 1K Not Required for Saga
R74/R75 10K Not Required for Saga
R76/R77 1K Not Required for Saga
R80-R86 1K Issue 5 Only?
I would not use these gerbers to manufacture a PCB without a lot more checking as that is NOT why it was done.
Have fun.
Parts
218| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | 22nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C1, C2, C3, C4, C5, C26, C29, C30, C40, C41, C42, C48, C55, C101, C102, C104 +12 |
| 19 | 1K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R24, R42, R45, R46, R47, R56, R58, R63, R73, R76, R77, R80, R81, R82, R83, R84 +3 |
| 18 | 470R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R17, R18, R19, R20, R21, R22, R23, R26, R27 +2 |
| 12 | 10K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R28, R29, R30, R49, R65, R66, R67, R68, R69, R72, R74, R75 |
| 11 | 1N4148 | Mod:D_DO-35_SOD27_P12.70mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9, D11, D18 |
| 9 | 8K2 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R9, R10, R11, R12, R13, R14, R15, R16, R89 |
| 8 | 4116 | Mod:DIP-16_W7.62mm_Socket | IC6, IC7, IC8, IC9, IC10, IC11, IC12, IC13 |
| 8 | TMS4532 | Mod:DIP-16_W7.62mm_Socket | IC15, IC16, IC17, IC18, IC19, IC20, IC21, IC22 |
| 6 | 100nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C43, C68, C69, C70, C71, C75 |
| 5 | 22uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C28, C34, C50, C65, C80 |
| 4 | 2K2 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R48, R51, R52, R79 |
| 4 | ZTX313 | Mod:TO-92Flat | TR1, TR2, TR3, TR6 |
| 3 | 15R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R61, R62, R64 |
| 3 | 1uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C27, C46, C79 |
| 2 | 100nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.40mm_Horizontal | C31, C32 |
| 2 | 100uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C44, C45 |
| 2 | 150pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C52, C53 |
| 2 | 16pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C72, C73 |
| 2 | 33pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C37, C38 |
| 2 | BA157 | Mod:D_DO-41_SOD81_P12.70mm_Horizontal | D15, D17 |
| 2 | BC184 | Mod:TR9 | TR8, TR9 |
| 1 | 0R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R87 |
| 1 | 100pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C67 |
| 1 | 10K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.40mm_Horizontal | R35 |
| 1 | 10nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C39 |
| 1 | 10nF | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | C100 |
| 1 | 10nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.40mm_Horizontal | C35 |
| 1 | 14Mhz | Mod:X1 | X1 |
| 1 | 15R 0.5W | Mod:R_Axial_DIN0516_L15.5mm_D5.0mm_P20.32mm_Horizontal | R34 |
| 1 | 180R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R25 |
| 1 | 180pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C105 |
| 1 | 1K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.40mm_Horizontal | R37 |
| 1 | 1K8 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R59 |
| 1 | 1N4148 | Mod:D_DO-35_SOD27_P12.40mm_Horizontal | D13 |
| 1 | 220K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R31 |
| 1 | 220R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R60 |
| 1 | 22pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C103 |
| 1 | 22uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.00mm_Horizontal | C25 |
| 1 | 2K7 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R90 |
| 1 | 390R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R53 |
| 1 | 3K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R43 |
| 1 | 4.43Mhz | Mod:X2 | X2 |
| 1 | 4.7uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C74 |
| 1 | 47nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C33 |
| 1 | 4K7 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R50 |
| 1 | 560pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C49 |
| 1 | 5K1 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R44 |
| 1 | 5V1 | Mod:D_DO-35_SOD27_P12.70mm_Horizontal | D19 |
| 1 | 680R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.40mm_Horizontal | R36 |
| 1 | 680R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R33 |
| 1 | 7805 | Mod:TO-220-3_Horizontal_TabDown | REG1 |
| 1 | Barrel_Jack_MountingPin | Mod:BarrelJack_Horizontal | J7 |
| 1 | CLK | Mod:KEYSTONE_1430-5 | LK1 |
| 1 | Conn_02x03_Odd_Even | Mod:RASCASLINK | J1 |
| 1 | EAR1 | Mod:3.5mm_socket | EAR1 |
| 1 | Edge_Connector | Mod:Edge Connector | E1 |
| 1 | JROM | Mod:ROM_WireLink | JROM1 |
| 1 | Keyboard5 | Mod:Keyboard5 | KB1 |
| 1 | Keyboard8 | Mod:Keyboard8 | KB2 |
| 1 | L1 | Mod:Wire_Link_7.62mm | L1 |
| 1 | L2 | Mod:Wire_Link_7.62mm | L2 |
| 1 | LK2 | Mod:Wire_Link_7.62mm | LK2 |
| 1 | LK3 | Mod:Wire_Link_7.62mm | LK3 |
| 1 | LKU | Mod:Link2.54 | J3 |
| 1 | LKV | Mod:Link2.54 | J2 |
| 1 | LM1889 | Mod:DIP-18_W7.62mm_Socket | IC14 |
| 1 | LS04 | Mod:DIP-14_W7.62mm_Socket | IC28 |
| 1 | MIC1 | Mod:3.5mm_socket | MIC1 |
| 1 | OKI | Mod:Wire_Link_7.62mm | OKI1 |
| 1 | OKI-H | Mod:Wire_Link_7.62mm | OKI-H1 |
| 1 | OKI-L | Mod:Wire_Link_7.62mm | OKI-L1 |
| 1 | Optional RESET Switch | Mod:PinHeader_1x02_P2.54mm_Vertical | SW2 |
| 1 | ROM | Mod:DIP-28_W15.24mm_Socket | IC5 |
| 1 | SW_SPDT | Mod:SHM1260H | SW1 |
| 1 | Speaker | Mod:Speaker | LS1 |
| 1 | TI | Mod:Wire_Link_7.62mm | TI1 |
| 1 | TI-3 | Mod:Wire_Link_7.62mm | TI-3 |
| 1 | TI-4 | Mod:Wire_Link_7.62mm | TI-4 |
| 1 | TV | Mod:Modulator4B | TV1 |
| 1 | Transformer_1P_1S | Mod:Coil | T1 |
The 211 most common of 218 parts.
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Questions
How big is the Issue6A PCB?
It measures 214 × 130 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Issue6A use?
218 parts, built around the BC184. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Issue6A KiCad files?
From the liveboxandy/ZX-Spectrum-48K-Issue-6A repository on GitHub, at the commit this page was made from: the board is Issue6A.kicad_pcb and its schematic Issue6A.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Issue6A design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).