RISC-V CoPro BBC BASIC memory map

[gerph]

I've created a diagram showing the memory map as used for the RISC-V CoPro's BBC BASIC, from https://github.com/hoglet67/PiTubeDirect/wiki/RISC-V-Co-Pro-Notes#rvbasic-memory-map using my 'memory layout' tool.

The output looks like this.

This is using the memory layout tool I wrote - https://pypi.org/project/memory-layout/

Generating the output

1. Create a file called riscv-bbcbasic.mld:

   
   %YAML 1.1
   ---
   # BBC BASIC for RISC-V memory map, from https://github.com/hoglet67/PiTubeDirect/wiki/RISC-V-Co-Pro-Notes#rvbasic-memory-map
   defaults:
   # Layout options
   unit_size: 0x10000
   unit_height: 0.3
   min_height: 0.3
   max_height: 1.0
   discontinuity_height: 2
   region_width: 3.25
   
   # Presentation options
   background: "#FFF"
   fill: "#FFF"
   outline: "#487748"
   outline_width: 2pt
   colour: "#487748"
   position: l
   
   # Address labels
   address_format: acorn

layout:

0x00000000: size: 0x10000 labels: "l": Basic String Buffer (64KB)

0x00010000: size: 0xC00 labels: "l": Basic Miscellaneous Buffers (3KB)

0x00010C00: size: 0x76F400 labels: "er,ib": "&00010C00 = default PAGE"

0x00780000: size: 0x780000 labels: "er,ib": "&00780000 = default HIMEM" "er,it": "&00F00000 = maximum HIMEM" "b": "BASIC Program/Workspace" junction_low: ticks

0x00F00000: size: 0x40000 labels: "l": C language heap (256KB, grows upwards)

0x00F40000: size: 0x40000 labels: "l": RISC-V stack (256KB, grows downwards)

0x00F80000: size: 0x40000 labels: "l": BBC Basic (256KB, 140KB used)

0x00FC0000: size: 0x3FFE0 labels: "l": Tube ROM (256KB, 5K used) 0x00FFFFE0: size: 0x20 labels: "l": Tube Registers

automatic: discontinuities: outline: "#487748" style: cut-out

addresses: side: left start: true final_end: true end_exclusive: false

2. Install the memory layout tool:

pip install memory_layout

3. Generate an SVG:

python -m memory_layout riscv-bbcbasic.mld

I'm not sure if it's at all useful to you, but it was fun, and this is exactly the sort of thing that I created the tool for. If it's not useful, feel free to close. If it is useful, feel free to use, and close... It's just fun after all :-)

[hoglet67]

Thanks for this Charles,

I'll add it in to the wiki page tomorrow.

Dave

[hoglet67]

This is now included in the wiki page, thanks.