Indigo Alpha4

This is an alpha release of the PiTubeDirect Indigo version.

IMPORTANT: If you want to use RISC-V BBC Basic on the RISC-V Co Processor, you must use version 20230924 or later, available here.

Changes from Indigo Alpha3 include:

Co Pro 8 (80x86 Co Pro):

• 9e9f9ee Co Pro 80x86: Change Co Pro name from 80286 to 80186

Co Pro 23 (RISC-V Co Pro):

• 993adc2 RISC-V Co Processor: Make R4 IRQ Re-enterant (#199)
• f4454ed RISC-V Co Processor: Implement the X bit in the Ecall Handler (#200)
• e5d175e RISC-V Co Processor: Preserve A7 in local OSCLI commands

Firmware Blob:

• 60e8f7d Updated firmware blob to current on 2023/10/13 (#204)