{"id":22869005,"url":"https://github.com/jbilander/reagnus-megachip","last_synced_at":"2026-01-11T02:47:54.346Z","repository":{"id":156591920,"uuid":"527705223","full_name":"jbilander/ReAgnus-MegAChip","owner":"jbilander","description":"A ReAgnus MegaAChip PCB that takes a Gowin FPGA with embedded PSRAM, a PLCC-84 plug and FET level shifters.","archived":false,"fork":false,"pushed_at":"2025-01-27T17:33:15.000Z","size":34293,"stargazers_count":25,"open_issues_count":1,"forks_count":0,"subscribers_count":7,"default_branch":"main","last_synced_at":"2025-03-20T23:51:20.540Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"","language":"Verilog","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"cc-by-sa-4.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/jbilander.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null}},"created_at":"2022-08-22T19:29:49.000Z","updated_at":"2025-02-12T11:27:08.000Z","dependencies_parsed_at":null,"dependency_job_id":"473b51ba-18b8-4b87-a22c-bec32623b23d","html_url":"https://github.com/jbilander/ReAgnus-MegAChip","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/jbilander%2FReAgnus-MegAChip","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/jbilander%2FReAgnus-MegAChip/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/jbilander%2FReAgnus-MegAChip/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/jbilander%2FReAgnus-MegAChip/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/jbilander","download_url":"https://codeload.github.com/jbilander/ReAgnus-MegAChip/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":246458009,"owners_count":20780678,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-12-13T12:44:51.677Z","updated_at":"2026-01-11T02:47:54.339Z","avatar_url":"https://github.com/jbilander.png","language":"Verilog","funding_links":[],"categories":[],"sub_categories":[],"readme":"# ReAgnus-MegAChip\nA ReAgnus MegaAChip PCB that takes a Gowin FPGA with embedded PSRAM, a PLCC-84 plug and FET level shifters.\n\n***\n\nTHIS IS WORK IN PROGRESS, HARDWARE IS VERIFIED WORKING. FIRMWARE YET TO BE DEVELOPED. BUILD AT YOUR OWN RISK.\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic1.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic1.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic21.png\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic21.png\" width=\"459\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic2.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic2.jpg\" width=\"400\" height=\"292\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic22.png\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic22.png\" width=\"455\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003cbr /\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic23.png\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic23.png\" width=\"800\" height=\"311\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic24.png\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic24.png\" width=\"800\" height=\"453\"\u003e\n\u003c/a\u003e\n\n***\n\n\n\n***\n\nFor hi-res pics goto the hi-res folder in pics\nhttps://github.com/jbilander/ReAgnus-MegAChip/tree/main/pics/hi-res\n\n***\n\nBOM Rev. 2C\n---------\nDesignator  | Name/Value   | Package | Notes\n-|-|-|-|\nU1 | Gowin FPGA GW1NR-UV9LQ144PC6/I5 | LQFP-144 | FPGA - Field Programmable Gate Array, 8640 LE, 121 I/O, Embedded 64Mbit 16-bit PSRAM \u003cbr /\u003e [GW1NR-UV9LQ144PC6/I5](https://www.mouser.com/ProductDetail/192-1NRUV9LQ144PC6I5)\nU2 | Voltage Regulator 3.3V, \u003cbr /\u003e LM1117-3.3 or \u003cbr /\u003e AMS1117-3.3 | SOT-223 | 3.3V 1A Low Drop-Out (LDO) Voltage regulator. https://www.aliexpress.com/item/32869037691.html\nU3 | Voltage Regulator 4.3V, TPS73643DBVR or \u003cbr /\u003e ABLIC S-1132B43-M5T1U | SOT-23-5 | 4.3V LDO Voltage Regulator\u003cbr /\u003e[TPS73643DBVR](https://www.mouser.com/ProductDetail/595-TPS73643DBVR) \u003cbr /\u003e[S-1132B43-M5T1U](https://www.mouser.com/ProductDetail/628-S-1132B43-M5T1G)\nU4,U5,U6,U7 | Digital Bus Switch ICs 20-Bit FET, SN74CBT16210CDGVR | TVSOP-48 | FET Level-shifter \u003cbr /\u003e [SN74CBT16210CDGVR](https://www.mouser.com/ProductDetail/595-SN74CBT16210CDGV)\nU8 | 74LVC1G07 Single Buffer With Open-Drain Output | SOT-353, SC-70-5 | [74LVC1G07](https://www.mouser.com/ProductDetail/621-74LVC1G07SE-7)\nU9 | X-tal driver 74LVC1GX04  | TSOP-6 1.65x3.05mm P0.95mm | [74LVC1GX04](https://www.mouser.com/ProductDetail/771-LVC1GX04GV125)\nU10 | Bus Transceiver 74LVC245APW,118 | TSSOP-20 | [74LVC245APW-T](https://www.mouser.com/ProductDetail/771-74LVC245APW-T)\nU11 | Voltage Regulator 1.8V, \u003cbr /\u003e MCP1702T-1802E/CB | SOT-23 | 1.8V Low Drop-Out (LDO) Voltage regulator. [MCP1702T1802E-CB](https://www.mouser.com/ProductDetail/579-MCP1702T1802E-CB)\nU12 | Winslow PLCC-84 Plug | PLCC-84 Plug | Optionally homemade plug\nU13 | PLCC-84_TH_pin_holes | Agnus_TH_plug_pins | Pins to use with homemade plug, 1.27mm pitch Long Pin 1x40P or 1x50P [Aliexpress](https://www.aliexpress.com/item/32894911767.html) Cut to length after soldering.\nY1 | 18pF Crystal 28.6363 MHz (NTSC) or 28.375 MHz (PAL) | 3.2 mm x 2.5 mm | [ECS-286.3-18-33-JEM-TR](https://www.mouser.com/ProductDetail/520-286.3-18-33-JEMT) (NTSC)\u003cbr /\u003e [ABM8-28.375MHZ-B2-T](https://www.mouser.com/ProductDetail/815-ABM8-28.375-B2-T) (PAL)\nR1 | Resistor 1k Ω | 0603 | Resistor in optional Oscillator-circuit\nR2 | Resistor 2.2M Ω | 0603 | Resistor in optional Oscillator-circuit\nR3 | Resistor 33 Ω | 0603 | Series resistor for CLK from U9 to avoid reflections (in optional Oscillator-circuit).\nR4 | Resistor 10k Ω | 0603 | Pull-up resistor for pin 41 (PAL/NTSC-selector for A500 Rev.6A/A2000/A3000-pinout) since A500 Rev.6A doesn't have pull-up on motherboard like A2000/A3000/A3000T have. Only needed for A500 Rev.6A. but doesn't hurt to populate anyway. \nR5 | Resistor 4.7k Ω | 0603 | Pull-down resistor for TCK in JTAG.\nRN1 | 4.7k or 10k Ω RES ARRAY 4 Resistors | 1206 | [CAY16-4701F4LF](https://www.mouser.com/ProductDetail/652-CAY16A-4701F4LF) or [CAY16-103J4LF](https://www.mouser.com/ProductDetail/652-CAY16-103J4LF)\nRN2 | 4.7k (CAY16-4701F4LF) RES ARRAY 4 Resistors | 1206 | [CAY16-4701F4LF](https://www.mouser.com/ProductDetail/652-CAY16A-4701F4LF)\nC1 | Capacitor Radial Polarized 100uF | 2.5mm pitch, Through-Hole | [ECE-A0JKA101I](https://www.mouser.com/ProductDetail/667-ECE-A0JKA101I)\nC2-C4 | Capacitor 10uF | 1206 | \nC5 | Capacitor 1uF | 0805 | \nC6 | Capacitor 10uF | 0805 |\nC9 | Capacitor 1uF | 0805 |\nC7,C8,C10-C16 | Capacitor 0.1uF = 100nF | 0805 |\nC17-C19 | Capacitor 0.01uF = 10nF | 0805 (or 0603) |\nC20 | Capacitor 0.1uF = 100nF | 0603 | Decoupling cap for U8\nC21-C24 | Capacitor 0.1uF = 100nF | 0603 | Decoupling caps for U4-U7\nC25 | Capacitor 0.1uF = 100nF | 0603 | Optional cap for U3, NR (Noise Reduction) pin 4 on TPS73643DBVR, this pin is NC on ABLIC S-1200B43-M5T1U\nC26 | Capacitor 0.01uF = 10nF | 0603 |\nC27-C28 | Capacitor 0.1uF = 100nF | 0603 |\nC29-C30 | Multilayer Ceramic Capacitors MLCC - 32pF | 0603 | [06031A320FAT2A ](https://www.mouser.com/ProductDetail/581-06031A320FAT2A) Caps for optional oscillator circuit \nL1 | (Ferrite Bead 600ohms 100MHz .5A Monolithic) or 0 Ω resistor  | 0805 | [HZ0805E601R-10](https://www.mouser.com/ProductDetail/875-HZ0805E601R-10) or 0 Ω resistor \nJ1 | VCC/GND Power Header Male | TH 1 x 2 Pin, 2.54mm pitch | For external power supply to allow programming of device when not plugged into the Amiga socket.\nJ2 | JTAG Pin Header Male | TH 2 x 5 Pin, 2.54mm pitch|\nJ3 | A20-A23 Pin Header Male | TH 2 x 2 Pin, 2.00mm pitch | Input Address lines for jumper-wires A20-A23\nJ4 | GND MountingHole_2.2mm_M2_Pad_Via | nut and bolt M2 size | for solid grounding via a ring lug connector and a thick jumper wire to Motherboard\n\n***\n\nSelect one of the crystals 28.375 MHz (PAL) or 28.6363 MHz for the optional onboard oscillator circuit. Probably you want to select PAL/NTSC opposite to what your CLK on motherboard has, this in order to be able to switch between native PAL/NTSC with only a JP-setting on the MegaChip board.\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic5.png\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic5.png\" width=\"500\" height=\"328\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic6.png\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic6.png\" width=\"237\" height=\"328\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic7.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic7.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic8.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic8.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic9.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic9.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic12.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic12.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic10.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic10.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic11.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic11.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic13.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic13.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/A500_plus_ReAgnus_MegAChip_board.png\"\u003e\n\u003cimg src=\"pics/A500_plus_ReAgnus_MegAChip_board.png\" width=\"403\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/A500_rev5_ReAgnus_MegAChip_board.png\"\u003e\n\u003cimg src=\"pics/A500_rev5_ReAgnus_MegAChip_board.png\" width=\"436\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/A500_rev6a_ReAgnus_MegAChip_board.png\"\u003e\n\u003cimg src=\"pics/A500_rev6a_ReAgnus_MegAChip_board.png\" width=\"435\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/A2000_ReAgnus_MegAChip_board.png\"\u003e\n\u003cimg src=\"pics/A2000_ReAgnus_MegAChip_board.png\" width=\"345\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/A3000_ReAgnus_MegAChip_board.png\"\u003e\n\u003cimg src=\"pics/A3000_ReAgnus_MegAChip_board.png\" width=\"330\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic14.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic14.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic15.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic15.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic16.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic16.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic17.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic17.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n\n\u003ca href=\"pics/ReAgnus-MegAChip_pic18.jpg\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic18.jpg\" width=\"400\" height=\"300\"\u003e\n\u003c/a\u003e\n\u003ca href=\"pics/ReAgnus-MegAChip_pic19.png\"\u003e\n\u003cimg src=\"pics/ReAgnus-MegAChip_pic19.png\" width=\"585\" height=\"300\"\u003e\n\u003c/a\u003e\n\n***\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjbilander%2Freagnus-megachip","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjbilander%2Freagnus-megachip","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjbilander%2Freagnus-megachip/lists"}