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IO Prototype (aka Slot)

baldengineer·Mega-IIe·kicad files/gd io proto pcb/gd io proto pcb.kicad_pcb

IO Prototype (aka Slot) PCB layout, top view — open source board by baldengineer
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About the IO Prototype (aka Slot) PCB

IO Prototype (aka Slot) is an open source PCB design by baldengineer, published on GitHub under the MIT license. It is a 2-layer board measuring 94.8 × 64.6 mm, with 37 components from 29 distinct parts.

Other key parts include the Slotmaker, 74HCT245 and LM7905_TO220. By type, the board carries 19 connectors, 7 capacitors, 4 diodes, 4 resistors and 3 ICs.

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 IO Prototype (aka Slot)

Slotmaker74HCT245LM7905_TO220

IO Prototype (aka Slot) bill of materials (BOM)

37 components, 29 distinct parts.

QtyPartRefs
1
Slotmaker
U1
1
74HCT245
U2
1
LM7905_TO220
U3
1
Pwr
J1
1
CTRL2
J2
1
Add_Main_Data
J3
1
CTRL1
J4
1
SData LA
J5
1
INT6
J6
1
IOSEL LA
J7
2
Buffered LA
J8, J9
1
DEV LA
J10
1
Annunciate
J11
1
Apple_II_Slot
J12
1
Slot Maker
J13
1
Slot Maker LA
J14
1
Slot-Only Sigs
J15
1
IO Selector
J16
1
-5V
J17
1
IOSEL
J18
Show 9 more
QtyPartRefs
1
DEVx
J19
1
5v
D2
1
-5v
D4
1
+12v
D5
1
-12v
D7
5
10u
C1, C2, C5, C6, C7
1
1uF
C3
1
10uF
C4
4
1K
R2, R4, R5, R7

IO Prototype (aka Slot) 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.

IO Prototype (aka Slot): common questions

How big is the IO Prototype (aka Slot) PCB?

The IO Prototype (aka Slot) measures 94.8 × 64.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the IO Prototype (aka Slot)?

37 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the IO Prototype (aka Slot) 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 IO Prototype (aka Slot) design in my own project?

Yes, under the terms of its MIT license, which baldengineer chose for the repository.

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