2 layers98 × 27 mm
2 layers18 × 31.2 mm
Addr dec
codepainters/e800j_addr_dec_atfElwro 800 Junior - address decoder PROM replacement using ATF1502.
- Size
- 18 × 31.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 5
- Nets
- 43
- Pads
- 78
- Tracks, vias
- 128, 37
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 10 Feb 2025
- Updated
- 11 Feb 2025
Overview
Addr dec is an open-source printed circuit board by codepainters, from the codepainters/e800j_addr_dec_atf repository on GitHub. It is a 2-layer board of 18 × 31.2 mm with 5 parts on 43 nets, routed with 128 tracks and 37 vias.
Its parts include 2 capacitors, 2 connectors and 1 IC. It belongs with the FPGA and CPLD boards of this library.
README
README.mdPROM replacement for Elwro 800 Junior - ATF1502ASL SMD variant
Elwro 800 Junior uses two SN74S474 512x8 PROMs as IO and memory address decoders. These PROMs are increasingly difficult to obtain (and program), this project provides a plug-in replacement for both address decoders based on ATF1502ASL CPLD in TQFP-44 package.
Note: there is another version using GAL16V8 in DIL-20.
Hardware files:
- pcb - schematic/PCB project in KiCAD 8 format
- PDF schematics - color and black&white
- interactive BOM file (you have to download it and open locally)
- Gerber files (in a jlcpcb-compatible ZIP format):
- addr_dec_atf.zip - single PCB
- addr_dec_atf_panel.zip - two PCBs panelized
For bitstream files and programming instructions go to bitstreams.
Under src you can find Quartus projects for I/O and MEM decoders (look there for details).
Parts
5| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 1 | ATF1502AS-xAx44 | Package_QFP:TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | JTAG | Connector_PinHeader_2.00mm:PinHeader_2x03_P2.00mm_Vertical | J2 |
| 1 | Plug | addr_dec:DIP-24_W15.24mm | J1 |
Questions
How big is the Addr dec PCB?
It measures 18 × 31.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Addr dec use?
5 parts. 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 Addr dec KiCad files?
From the codepainters/e800j_addr_dec_atf repository on GitHub, at the commit this page was made from: the board is pcb/addr_dec.kicad_pcb and its schematic pcb/addr_dec.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Addr dec design in my own project?
Its repository states no licence, so its author keeps all rights: ask codepainters before reusing the design.
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