Model B - Video ULA Replacement V03
About the Model B - Video ULA Replacement V03 PCB
Model B - Video ULA Replacement V03 is an open source PCB design by kgl2001, published on GitHub. It is a 2-layer board measuring 17.8 × 35.6 mm, with 17 components from 11 distinct parts.
Other key parts include the VC2069 Socket, ATF1504AS-xAx44, IS62C256AL-45TLI and 74LVC1G17. By type, the board carries 8 capacitors, 4 ICs, 3 resistors, 1 crystal and 1 connector.
From the project
VideoULA replacement for BBC Micro - 44 pin ATF1504AS version
This repository contains the hardware design and firmware for the VideoULA V03, a drop-in replacement for the VC2069 Video ULA (IC6) in the Acorn BBC Micro Model B and Master 128.
The original BBC Micro Video ULA (IC6) is a custom ASIC that is no longer manufactured. Failed or missing ULAs result in a non-functional machine. This project provides a modern replacement using a CPLD and a small external SRAM for palette storage.
Main components on the Model B - Video ULA Replacement V03
Model B - Video ULA Replacement V03 bill of materials (BOM)
17 components, 11 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | VC2069 Socket | DIP-28_W15.24mm | IC6 |
| 1 | ATF1504AS-xAx44 | TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | IS62C256AL-45TLI | TSOP-I-28_11.8x8mm_P0.55mm_SRAM | U2 |
| 1 | 74LVC1G17 | SOT-23-5 | U3 |
| 1 | 48MHz | Oscillator_SMD_Yajingxin_TFOM48M4RHKCNT2T-4Pin_3.2x2.5mm | X1 |
| 1 | Conn_01x01 | PinHeader_1x01_P2.54mm_Horizontal | J2 |
| 7 | 100n | C_0603_1608Metric | C1.1, C1.2, C1.3, C1.4, C2, C3, C4 |
| 1 | 10u | C_0603_1608Metric | C5 |
| 1 | 47R | R_0603_1608Metric | R1 |
| 1 | 10K | R_0603_1608Metric | R2 |
| 1 | 10K | R_Array_Convex_4x0603 | RN1 |
Model B - Video ULA Replacement V03 design files
The KiCad project lives in the kgl2001/VideoULA_V03 repository on GitHub; these links point at the commit this page was built from.
Model B - Video ULA Replacement V03: common questions
How big is the Model B - Video ULA Replacement V03 PCB?
The Model B - Video ULA Replacement V03 measures 17.8 × 35.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Model B - Video ULA Replacement V03?
17 components, from 11 distinct parts. The full bill of materials is listed on this page.
Where can I download the Model B - Video ULA Replacement V03 design files?
From the kgl2001/VideoULA_V03 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Model B - Video ULA Replacement V03 design in my own project?
The repository has no license, so all rights stay with kgl2001. Use it as a reference, and ask the author before reusing the design.
