Mike's PCjr Page

I finally received and tested the 3D printed enclosure I posted a few weeks ago. It was printed in nylon using an SLS process, but the model is also suitable for the typical at-home FDM 3D printing. https://www.raphnet.net/electronique/sdcartJR/th_sdcartjr_enclosure1.jpg https://www.raphnet.net/elec...

A new version (v04) of the SD-Cart JR software is available! Mostly compatibility improvements and small fixes: sdpart.com / sdcart.sys : Add retries reading MBR (fixes some non-working cards) sdcart.sys : Use CMD13 (Send Status) instead of CMD10 (Read CID) to detect card changes (Solves occasional ...

yes you're absolutely right I should first try running format /mbr ... thanks for all your help! If you get the chance, could you confirm if the DOS 5.0 fdisk /mbr command alone fixed it? I plan to write a few paragraphs about booting and related troubleshooting, and I would like to mention fdisk /...

That worked! I ran "c" and "w" in sdpart and then fdisk/format and now DOS 3.3 boots perfectly! So any reason I shouldn't try this with the DOS 5 sd card? I would just have to patch for the jr..which my version of DOS 5 format.com does seamlessly using /s since it has been patch...

Yes I've deleted/added/made active DOS primary partitions in fdisk for both 3.3 and 5.02 and then format/s. I tried again and now get an error message when I try to boot DOS 3.3 from the 64mb card (see left pic and error below). I also tried another card with patched DOS 5.02 (right top pic) and ge...

That worked! Kinda. Once. sdpart.com worked once when I used it right after booting up. But if I try it a second time (even immediately) it fails again. Rebooted and tried again and it didn't work. Ok, I may need to try several things to diagnose and correct this... so I ordered the same model of c...

raphnet wrote:Here is another debug build which will wait 4 times longer. Could you tell me if it makes any difference?

Sorry, here it is: https://www.raphnet.net/electronique/sd ... debug2.zip

E2 Error reading boot sector Thank you for testing! Ok, so E2 means a timeout waiting for the data packet from the card. Maybe this card is a bit slower than others? (or do you have a V20 CPU?) Here is another debug build which will wait 4 times longer. Could you tell me if it makes any difference?...

Code: Select all SDpart version 0.3 Partition tool for SD-Cart JR Running on DOS 5.0 Initializing card... OK Card: 74/J' (Transcend) SDC v1.0 Serial 38 00 EC CE , OCR: 80FF800 SD Version 1.0, Byte-addressed Sectors: 0x003BD800 SD-Cart geometry: CHS=244,255,63 Sorry for the delay! Unfortunately I do...

Release v03 is now available. Large cards are now supported, and there is an important bugfix for partitions larger than 32M using sdcart.sys! Add support for block-addressed cards (For cards >2GB) Implement >32M partition support in sdcart.sys Add a 'low memory' version of sdcart.sys (sdcartl.sys)....