Gd MegaII proto
About the Gd MegaII proto PCB
Gd MegaII proto is an open source PCB design by baldengineer, published on GitHub under the MIT license. It is a 4-layer board measuring 98.8 × 115.3 mm, with 56 components from 29 distinct parts.
Other key parts include the Apple_MEGA_II, DRAM64KX4, 74HCT245 and 74HCT86. By type, the board carries 12 connectors, 12 resistors, 11 capacitors, 9 ICs, 9 jumpers and 2 test points.
From the project
Using the Mega II from a IIgs to make a Apple IIe compatible computer: The Mega IIe!
It connects to both the VGC and 6502 boards. The VGC connects with a 40-pin cable, like an IDE cable. The 6502 connects with a couple of ribbon cables.
Main components on the Gd MegaII proto
Gd MegaII proto bill of materials (BOM)
56 components, 29 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Apple_MEGA_II | PLCC-84_THT-Socket | U1 |
| 4 | DRAM64KX4 | DIP-18_W7.62mm_Socket_LongPads | U2, U4, U7, U9 |
| 3 | 74HCT245 | SOIC-20W_7.5x12.8mm_P1.27mm | U3, U5, U8 |
| 1 | 74HCT86 | SOIC-14_3.9x8.7mm_P1.27mm | U6 |
| 1 | ABDIR | PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | ABEN | PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | FLIP | PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | DBDIR | PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | DBEN | PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | VGC Extra 1 | PinHeader_1x03_P2.54mm_Vertical | J6 |
| 1 | Bald-Ext-1 | PinHeader_2x20_P2.54mm_Vertical | J7 |
| 1 | VGC Extra 2 | PinHeader_1x03_P2.54mm_Vertical | J8 |
| 1 | Address | PinHeader_2x10_P2.54mm_Vertical | J9 |
| 1 | Data | PinHeader_2x05_P2.54mm_Vertical | J10 |
| 1 | PWR | PinHeader_1x04_P2.54mm_Vertical | J11 |
| 1 | CLKS | PinHeader_1x04_P2.54mm_Vertical | J12 |
| 1 | RGB Binary | PinHeader_1x04_P2.54mm_Vertical | JP1 |
| 4 | P54-63 | PinHeader_1x10_P2.54mm_Vertical | JP3, JP7, JP12, JP16 |
| 4 | P64-74 | PinHeader_1x11_P2.54mm_Vertical | JP4, JP8, JP11, JP15 |
| 2 | TestPoint | Harwin-S1751-46-Test-Point | TP97, TP98 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PWR | LED_1206_3216Metric | D1 |
| 1 | 100nF | C_0805_2012Metric | C1 |
| 1 | 100uF | CP_Radial_D8.0mm_P5.00mm | C2 |
| 8 | 1uF | C_0805_2012Metric | C3, C4, C5, C6, C7, C8, C9, C11 |
| 1 | 10uF | C_0805_2012Metric | C10 |
| 1 | 1k | R_0805_2012Metric | R1 |
| 2 | 100 | R_0805_2012Metric | R14, R15 |
| 6 | R_Pack04 | R_Array_Convex_4x0612 | RN1, RN2, RN3, RN4, RN5, RN6 |
| 3 | 100 | R_Array_Convex_4x0612 | RN7, RN8, RN9 |
Gd MegaII proto design files
The KiCad project lives in the baldengineer/Mega-IIe repository on GitHub; these links point at the commit this page was built from.
Gd MegaII proto: common questions
How big is the Gd MegaII proto PCB?
The Gd MegaII proto measures 98.8 × 115.3 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Gd MegaII proto?
56 components, from 29 distinct parts. The full bill of materials is listed on this page.
Where can I download the Gd MegaII proto design files?
From the baldengineer/Mega-IIe repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Gd MegaII proto design in my own project?
Yes, under the terms of its MIT license, which baldengineer chose for the repository.
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