GUI RAM

RAM Panel

This panel configures the amount and type of memory available to the emulated Amiga. Each memory type corresponds to a specific hardware expansion slot or on-board memory region.

Memory Settings

Each memory type is configured with a slider. The current size is shown in a read-only field to the right of the slider.

Chip

• Main memory shared between the CPU and all custom chips (Agnus, Denise, Paula).
• Sizes: 256KB, 512KB, 1MB, 1.5MB, 2MB, 4MB, 8MB
• Enabling more than 512KB automatically enables ECS Agnus (required to address the extra memory).
• Chip RAM above 2MB conflicts with Z2 Fast RAM — Z2 Fast RAM will be reduced automatically.

Z2 Fast

• Zorro II expansion memory. CPU-only access, not accessible by custom chips.
• 16-bit bus, maximum 8MB.
• Cannot be used simultaneously with Chip RAM above 2MB.

Processor slot

• Fast RAM provided by a CPU accelerator card installed in the processor slot.
• Not accessible by custom chips.

Motherboard Fast

• Fast RAM built into the motherboard (A3000/A4000 style).
• Not accessible by custom chips.

Slow

• Slow RAM (also called Bogo RAM or Ranger RAM), located in the A500/A2000 trapdoor expansion slot.
• Accessible by custom chips but slower than Chip RAM.
• Sizes: None, 512KB, 1MB, 1.5MB, 1.75MB

Z3 Fast

• Zorro III expansion memory. 32-bit bus, used with 68030+ CPUs.
• Requires 32-bit addressing mode (disabled when 24-bit address space is active).
• Not accessible by custom chips.

32-bit Chip

• Extended Chip RAM accessible by custom chips, mapped in the Zorro III address space.
• Requires 32-bit addressing mode.

Memory info line

• Displays a summary of configured Z3 memory, total host memory reserved, and available Z3 space for UAE and real address modes.

Advanced Memory Settings

Provides per-board configuration for individual RAM expansion slots.

Board selector

• Dropdown listing all available memory boards: Chip RAM, Slow RAM, Z2 Fast RAM #1–#N, Z3 Fast RAM #1–#N, Processor Slot Fast RAM, Motherboard Fast RAM, and 32-bit Chip RAM.
• Boards with memory configured show their size in brackets.

Size slider

• Sets the size of the selected memory board. Available sizes depend on the board type.

Manufacturer

• Hexadecimal manufacturer ID for the Autoconfig board identification.
• Only editable when "Edit Autoconfig data" is checked.

Product

• Hexadecimal product ID for the Autoconfig board identification.
• Only editable when "Edit Autoconfig data" is checked.

Autoconfig data

• Read-only display of the raw Autoconfig bytes for the selected board.

Memory board

• Selects a specific real-world RAM expansion board type (e.g., a particular manufacturer's Z2 or Z3 card).
• Only available for Z2 and Z3 Fast RAM boards.
• Selecting a board sets the manufacturer and product IDs and Autoconfig data accordingly.
• Select - to clear the board selection and use default Autoconfig data.

Address range

• Start and end addresses for manually configured boards.
• Only editable when "Manual configuration" is checked.

Edit Autoconfig data

• Enables editing of the manufacturer and product ID fields for custom board identification.

Manual configuration

• Overrides automatic address assignment and allows specifying a custom address range.

DMA Capable

• Indicates whether the memory board supports DMA transfers. Most expansion RAM supports DMA.

Force 16-bit

• Forces 16-bit access width for this memory board. May be needed for compatibility with some older boards.

Slow RAM

• Uses Chip RAM timing for this memory board. Slower but may be required for certain configurations.

Z3 mapping mode

• Controls how Zorro III memory addresses are mapped.
• Options:
  • Automatic (*) — Uses the optimal mapping for the current configuration
  • UAE — Uses UAE-compatible address layout
  • Real — Uses real Amiga hardware addresses
• Only available when 32-bit addressing mode is active.