Attached is a scan of the original SCELBI bill of materials for the boards and a consolidated version in excell format. I forget where I got the scan, and apoligize in advance for not giving credit to the person that did this work. I haven’t checked for accuracy, but it “feels” right.
The hardest part to find is the 8008, though there always seem to be a few on ebay (at crazy prices). I plan on offering a bundled 8008D as an extra cost option with PCB sets. The D part is a package type, not a speed option. Most original SCELBIs had C package type, but they are harder to find (and more expensive). American Microsemiconductor has thousands of 1101s in stock at good prices (under $4). I have some extra 1101s, and may offer a bundle of 8 as an extra cost option. 74XX parts are available from unicorn electronics in PA.
Each memory board supports up to 4 banks of 8 chips each bank, for a maximum total of 32 chips per board (1K of memory). You can add up to 4 memory boards into a 8H for a maximum of 128 chips and 4K of memory. The minimum is 1 bank of 8 chips on 1 SRAM board for a total of 8 chips and 256 bytes.
You need 6K of memory to run SCELBI BASIC, so it is not possible on a normal 8H. I’ve already started development of the additional/different 4 boards needed for a SCELBI 8B, which can run SCELBI BASIC. The 4 additional boards are a different backplane, 4K SRAM board, memory expansion board and a PROM board. The CPU, DBB, INPUT and front panel are exactly the same for both 8H and 8B systems.
I’m currently looking at edge connector options and will post information on that and other chassis parts in a few days. The edge connector is .156 pin spacing and .140 row spacing, same as Apple 1, though you want ears and longer pins, if possible. Some wires are connected to the edge connector from the back side of the backplane, which makes longer pins desirable.
Here is an interesting bit of trivia – not including the chassis components, the 8 boards making up a fully populated 4K SCELBI 8H require 587 individual components compared to 221 making up an Apple 1 motherboard populated with 8K and 278 making up a 48K Apple II, rev 0.