Wire wrap slot expander for Replica 1 Ten

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Wire wrap slot expander for Replica 1 Ten

Hi all,

Now that my Replica 1 Ten has a basic compliment of I/O peripherals (ASCII keyboard, monitor, and CFFA1), I'm thinking of adding a slot expander. 

Comparing Vince Briel's no-longer-available Slot Expander 1 with Speedy G's Slotexpansioncard and Wendell Sander's Apple 1 Expansion Board, I have a couple of takeaways:

  1. Vince's board appears to be a set of expansion slots in series with no additional components (other than the 40-pin header needed for the original Replica 1)
  2. Speedy and Wendell's boards appear to use additional components to address the buffering, power regulation, and VMA line isolation needed by original Apple-1s and full-size replicas.

Is it reasonable to assume that, given that the Propeller chip handles all I/O, that a wire wrap board with an edge connector and 44-pin slots wired in series would function properly with my Replica 1 Ten? Or am I mssing key considerations around buffering, regulation, and isolation?

P.S. I fully understand that the Replica 1 doesn't provide -12v and that cards that required -12v would require me to add an additional power supply and that might, in turn, require regulation. So, let's assume no -12v for any cards in my system.

Thanks—Jameson

Tom Owad's picture
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The 44-pin bus exposes the

The 44-pin bus exposes the address and data bus directly. How is the Propeller involved?

As far as wire-wrapping in general, my wire-wrap processor section worked fine. I used buffers for the 44-pin connector, but all I used it for was to make a single-step board with LED status.

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Thanks.

Tom,

Thanks for the correction regarding the Propeller chip and for sharing that link. I'll give it a closer look.

Jameson

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