Gd IWM proto
About the Gd IWM proto PCB
Gd IWM proto is an open source PCB design by baldengineer, published on GitHub under the MIT license. It is a 2-layer board measuring 93.2 × 54.7 mm, with 60 components from 29 distinct parts.
Other key parts include the NE556, IWM and HCT251. By type, the board carries 25 resistors, 16 connectors, 11 capacitors, 4 ICs and 4 diodes.
From the project
Using the Mega II from a IIgs to make a Apple IIe compatible computer: The Mega IIe!
The Proto PCBs are boards to prototype an IIe from the IIgs ASICs. Eventually, these will be condensed to a single board.
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.
The VGC also generates the 14 MHz clock from a 28 MHz oscilliator. (It is not clear yet which clocks the MEGA-II generates and which the VGC does.)
Main components on the Gd IWM proto
Gd IWM proto bill of materials (BOM)
60 components, 29 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | NE556 | SO-14_3.9x8.65mm_P1.27mm | U1, U2 |
| 1 | IWM | PLCC-28_THT-Socket | U3 |
| 1 | HCT251 | SOIC-16_3.9x9.9mm_P1.27mm | U4 |
| 1 | DB19_4 | PinHeader_1x02_P2.54mm_Vertical-LOCK | J1 |
| 1 | DSUB19 | DSUB-19_Apple_II_Floppy | J2 |
| 1 | DB19_16 | PinHeader_1x02_P2.54mm_Vertical-LOCK | J3 |
| 3 | EN | PinHeader_1x03_P2.54mm_Vertical-LOCK | J4, J5, J17 |
| 1 | PWR | PinHeader_2x04_P2.54mm_Horizontal | J6 |
| 1 | 555_LA | PinHeader_2x05_P2.54mm_Horizontal | J8 |
| 1 | CPx_LA | PinHeader_2x05_P2.54mm_Horizontal | J10 |
| 1 | Addr_Main_Data | PinHeader_2x16_P2.54mm_Horizontal | J11 |
| 1 | Game Port | DIP-16_W7.62mm_Socket | J13 |
| 1 | CTRL2 | PinHeader_2x05_P2.54mm_Horizontal | J14 |
| 1 | IWM-LA | PinHeader_2x06_P2.54mm_Horizontal | J15 |
| 1 | FDC Hdr | PinHeader_2x10_P2.54mm_Vertical | J16 |
| 1 | CTRL1 | PinHeader_2x05_P2.54mm_Horizontal | J18 |
| 1 | Slot_Maker | PinHeader_1x02_P2.54mm_Vertical-LOCK | J19 |
| 1 | -5v | LED_1206_3216Metric | D2 |
| 1 | +5v | LED_1206_3216Metric | D3 |
| 1 | +12v | LED_1206_3216Metric | D4 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | DSK | LED_1206_3216Metric | D5 |
| 4 | 10u | C_0805_2012Metric | C1, C6, C7, C8 |
| 4 | .1u | C_0805_2012Metric | C2, C3, C4, C5 |
| 3 | 1u | C_0805_2012Metric | C9, C10, C11 |
| 7 | 1K | R_0805_2012Metric | R3, R4, R7, R8, R9, R10, R11 |
| 4 | 100 | R_0805_2012Metric | R5, R6, R12, R13 |
| 8 | 22 | R_0805_2012Metric | R14, R15, R16, R17, R18, R19, R20, R21 |
| 4 | 4k7 | R_0805_2012Metric | R22, R23, R24, R27 |
| 2 | 200k | R_0805_2012Metric | R25, R26 |
Gd IWM 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 IWM proto: common questions
How big is the Gd IWM proto PCB?
The Gd IWM proto measures 93.2 × 54.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Gd IWM proto?
60 components, from 29 distinct parts. The full bill of materials is listed on this page.
Where can I download the Gd IWM proto design files?
From the baldengineer/Mega-IIe repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Gd IWM proto design in my own project?
Yes, under the terms of its MIT license, which baldengineer chose for the repository.
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