FreeDOSNews 5 min read
Microsoft Declares MS-DOS 6.22 and Earlier Obsolete
Microsoft's archived table records December 31, 2001 as DOS support retirement, but its surviving row names MS-DOS 6.0 rather than 6.22.
#news#ms-dos#end-of-life
Read more All posts - Page 34
Operating systems, infrastructure, emulation, and technical history.
FreeDOSNews 5 min read
Jim Hall Posts the PD-DOS Announcement That Became FreeDOS
Jim Hall's June 29, 1994 Usenet post proposed PD-DOS with a manifest and task list; contributors responded, and the GPL project became Free-DOS within weeks.
#news#freedos#jim-hall
Read more FreeDOSDeep Dive 5 min read
Upper Memory Blocks and Loading TSRs High
How DOS users reclaimed conventional memory by relocating drivers and TSRs into unused upper memory gaps, which varied by machine and BIOS.
#umb#tsr#memory-optimization
Read more FreeDOSDeep Dive 5 min read
XMS, EMS, and the Many Kinds of DOS Memory Beyond 640K
Why DOS ended up with three separate, incompatible ways to access memory beyond the conventional 640K barrier, and what each one was actually solving.
#xms#ems#memory-management
Read more FreeBSDDeep Dive 7 min read
Capsicum Beyond the Basics: Building Capability-Mode Services From Scratch
How to design a FreeBSD service around Capsicum descriptor rights, capability mode, process descriptors, and delegated Casper services.
#capsicum#security#sandboxing
Read more FreeBSDFix 6 min read
Fixing bhyve VMs That Refuse to Boot With UEFI Firmware
A layered bhyve UEFI diagnostic for firmware paths, VNC output, NVRAM state, EFI partitions, virtual disks, drivers, and stale VMs.
#bhyve#uefi#virtualization
Read more FreeBSDFix 5 min read
Fixing a Corrupted GPT Boot Partition on FreeBSD
How to distinguish damaged GPT metadata from missing BIOS or EFI boot code, recover safely from the backup table, and verify every write.
#fix#boot#gpt
Read more FreeBSDFix 6 min read
Diagnosing FreeBSD Ethernet Link Flapping at the Driver Level
How to correlate FreeBSD link events, counters, negotiated media, switch logs, optics, driver messages, and EEE before changing anything.
#networking#drivers#ethernet
Read more FreeBSDFix 6 min read
Diagnosing a FreeBSD Kernel Panic from a Crash Dump
How to verify FreeBSD dump capture, preserve vmcore evidence, match kernel symbols, read crashinfo and kgdb traces, and report a panic.
#fix#kernel#debugging
Read more FreeBSDFix 6 min read
Fixing FreeBSD Time Sync Drift When ntpd Won't Converge
How to diagnose FreeBSD ntpd source selection, reachability, offset thresholds, drift, virtual clocks, and safe one-time clock steps.
#ntpd#time-sync#networking
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