Use the Core2x

New Features Documentation for the Core2x for K2 and Jr2

Overview

These new features were brought in as a new FPGA core back in August of 2025. It was feature complete for the K2 and mostly feature complete for the Jr2. Since early 2026, feature parity is coming to the Jr2.

Here is the original reference document from August 2025 from Stefany Allaire: Core2x_ShortForm_Documentation

Here is Stefany Allaire's video on the Core2x features: https://www.youtube.com/watch?v=ECu1Z3AwZEw

Flat mode 24 bit memory addressing and accessing 3 new banks of 512kb of SRAM

To do.

Moving I/O decoding and Flash/Cart to higher memory

To do.

Accessing an extra bank of 64 sprites

To access the extra bank of 64 sprites using the same register locations as the first 64 sprites, just set bit 6 to 1 of register 0x0001.

Keep it cleared when you want to access the first bank.

The sprite registers are well documented in chapter 5 of the Jr reference book at start at 0xD900, assuming you have i/o page set at 0.

I/O Memory Control Register (0x0001)

B7	B6	B5	B4	B3	B2	B1	B0
Not used	Sprite Block Select - 0:Sprite 0-63, 1:Sprite 64-127	Move Flash/Cart to High	Move IO Devices to High	Active IO Page[2]	IO Page Disable - 0:Enabled, 1:Disabled	Active IO Page[1]	Active IO Page[0]

New layer: memtext mode (more colors, fonts, background and foreground bigger LUTs)

To do.

VDMA Controller adds 16bit memcopy

To do.

Fast hardware line draw

To do.

Floating point module =

To do.