VME SystemBoard
VME SystemBoard is an open source PCB design by transistorfet: a 2-layer, 100 × 100 mm board with 31 components (17 distinct parts). It is built around the ATF1508AS-10JU84, 74HC14, VME64-P1-3R. Filed under retro computing.
A collection of VME-based hardware and software for modular computers
A somewhat generic card with an ATF1508 programmable logic device, which is intended to act as the system board of the VME bus, handling the resolution and granting of the bus during bus arbitration, and interrupt acknowledging. It has a clock and a reset button, which can be programmed in the logic to reset all devices on the bus.
I have not actually built this version of the card, and instead built the SystemBoardSMT after finding out that the PLCC version of the ATF1508AS was End-of-Life, and out of stock at Digikey and Mouser. It should work, but I'd recommend comparing the signals to…
Built around
Parts list
31 components, 17 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATF1508AS-10JU84 | PLCC-84_THT-Socket | U1 |
| 1 | 74HC14 | DIP-14_W7.62mm_LongPads | U2 |
| 1 | VME64-P1-3R | DIN41612_C_3x32_Male_Horizontal_THT | U3 |
| 1 | Crystal | Crystal_HC49-4H_Vertical | Y1 |
| 2 | 5V | PinHeader_1x02_P2.54mm_Vertical | J1, J2 |
| 1 | JTAG | PinHeader_2x05_P2.54mm_Vertical | J3 |
| 1 | RESET | SW_PUSH_6mm | SW1 |
| 1 | Ground Loop | TestPoint_Loop_D2.60mm_Drill1.6mm_Beaded | TP1 |
| 1 | POWER | LED_D3.0mm | D1 |
| 1 | STATUS | LED_D3.0mm | D2 |
| 9 | 0.1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C7, C8, C9 +1 |
| 1 | 4.7uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 2 | 18pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C10, C11 |
| 3 | 4.7k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R4 |
| 2 | 220 | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R3, R6 |
| 2 | 10k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R5, R8 |
| 1 | 15k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R7 |
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