If you find issues or odd behavior, please send an email.
To: mr-atari @ mr-atari . com (remove the spaces)
Please zip and attach the software you are running.

Features:
Fully XL/XE-compatible
Fully 400/800-compatible
Fast mathpack routines

Supports:
PBI (if present on your hardware)
MyIDE-][ (if present and updated)
SIO2BT
U1MB, ANTONIA and other upgrades with flashable OS-space

MyIDE-][ layout:
128k reserved for emulating cartridges and atarimax fat32-loading
 64k reserved for 64k memory load/save
304k reserved for device "D8:" SRAMDISK
 15k reserved for MyIDE-code
896b reserved for MyIDE work SRAM
128b reserved for Atarimax work-SRAM

--------------------Change log--------------------

02-02-2018 V04
CARTRIDGE CONTENT:
Changed, upgraded ATBasic to 1.55
MYBIOS:
-changed, version 4
-added, one try to connect with 112k (115k2 baud)
-fixed, corrected user feedback from keyklick to beep.
-fixed, serin-routine wrapping on a page-boundary, wasting cycles.
-removed, usage of wsync in SIO-wait routines.
MYIDE:
-changed, version 3
-fixed, on-the-fly, menu changes and coldstart did not accept this.
-fixed, activity LED stays ON, remove DRQ on partial sectors.
-changed, moved MyIDE-buffer, fixes some illegal stack-usage.

07-07-2017 V03
MYBIOS:
-changed, version 3
-changed, welcome screen layout and controls (removed "S").
-added, conditional toggling of BASIC.
-removed, conditional SIO2BT-support, now always supported.
-fixed, flaky powerup with myide-][ inserted (on realhardware).
-updated, MyBIOS manual.
MYIDE-PLUGIN:
-changed, version 2
-added, reset MyIDE-II in the MAIN MENU
-added, experimentel: search first 32k memory for possible DLIST if shadow-registers are zero (STAR RAIDERS)
-fixed, keep changes made in the main menu
-unlocked, MAIN MENU S(ave) and L(oad): 64k user RAM, PORTB and MyIDE-settings.

27-06-2017 V02
Reprogrammed most of the bootloader routines since they were corrupted.
So a fresh start (again).....
-changed, welcome screen layout and controls
-changed, MyBIOS version -02
-changed, MyIDE PLUGIN version -1
-fixed, some SIO time-out error/handling
-fixed, SIO2BT support with 850 bootstrap-support

21-06-2017
DUE TO SOME WEIRD BEHAVIOR, ZIP-FILE TAKEN OFF-LINE FOR SOME DAYS.

20-06-2017 V01
-added, support for relocate-able BIOS.PAC on flash-content (custom MCW-usage).
-added, HELP-key as reboot/backdoor-entry, when no MyIDE PLUG-IN is loaded. 
-added, optional separation, MyBIOS-RAM and MyIDE PLUG-IN.
-added, optional support, MyBIOS-ROM uses MyIDE PLUG-IN from MyBIOS-RAM.PAC
-added, show CAR when MyIDE-][ is in use as (emulated) cartridge or such.
-added, Show Vx (version) of MyIDE PLUG-IN when loaded.
-removed, need of hidden MENU's on flash-content (custom MCW-usage).
-fixed, boot-error retry/reload handling.
-fixed, several RESET-issues regarding "safe handling" under the running software.
-changed, SIO2BT-support less retries (takes too long) but breaks 850 bootloader support.
-changed, WIP to Vxx (version).
-updated, MyBIOS manual

11-06-2017
-uploaded, MyBIOS manual.

27-05-2017
-added, MENU, do coldstart when internal rom is toggled.
-fixed, 400/800/1200XL, test presence of internal rom.
-fixed, NTSC-antic, fit welcome screen into frame.
-fixed, RTC during SIO.
-fixed, HELP/MENU killing IO.
-fixed, SIO-loss, block custom NMI/DLI/IRQ.
-update, Altirra basic 1.54

22-04-2017 Updated upload:
-added MyBIOS-RAM to MyIDE-][ content.
-changed V0x to WIP.

20-04-2017 Initial upload:
-MyBIOS-ROM, based on 4.8 and 4.9 development/feedback.
-MyIDE-][ content with IDE-extensions hidden in banks $3E/$3F.
-added FMP, Fast Math Pack.