Boot ROM v0.41 for use with SD-Cart JR

Update your SD-Cart JR with this new boot ROM which supports the use of other hard drives on the system, such as a jr-IDE.

  • This item
  • New: Options menu (SD-Cart JR + other hard disk)
  • New: Options menu (SD-Cart JR alone on the system)

Description

This is a pre-programmed EPROM containing the latest version of the SD-Cart JR BIOS. Intended as an easy upgrade path for SD-Cart JR owners without an EPROM programmer.

New in this version (0.41):
  • Fdisk now sees all drives, so you can, for instance, boot from your jr-IDE to partition a new card in your new SD-Cart JR, or the opposite. (Boot from an SD-Cart JR to install DOS on a jr-IDE)
  • The boot count-down can now be skipped by pressing ESCAPE.
What was new in version 0.40:
  • Added support for system with multiple hard drives. (Tested with jr-IDE).
  • New options menu, allowing to:
    • Install the SD-Cart JR as last drive (default)
      (i.e. if C: is your jr-IDE, the SD-Cart JR will be D:)
    • Install the SD-Cart JR as first drive
      (i.e. if C: is normally your jr-IDE, it becomes D: and the SD-Cart JR is C:)
    • Install the SD-Cart JR as single drive
      (other drives not visible)
    • Disable the SD-Cart JR BIOS.

Note: The chip cannot be reprogrammed.

Ordering

Buy here

In stock : Ships within 5 business days unless noted otherwise (out of stock, pre-order, holidays, etc).
This summer, we are be taking a break from July 22 (2026) to July 30. Most orders placed in that period will only be shipped after July 31.

Item #ROM-SDCARTJR_0.41
DescriptionBoot ROM for SD-Cart JR v1 (to upgrade to ROM version 0.41)
Price$7.95
Country of originTaiwan

We normally ship within 5 days (excluding week-ends and holidays) after payment.
Prices are in US dollars and are subject to change without notice.

Other ways to buy

Related products

Product photo
SD-Cart JR: A card reader cartridge for the IBM PCjr

This cartridge PCB lets you use MMC/SD cards as a removable storage medium for your PCjr and can even replace a hard drive!

Starting from $35.99

Keywords

components
retro computing
pcjr