System Requirements

Retro7zip System Requirements

DOS System Requirements

• 386 CPU
• 4 MB RAM
• DOS 3.3 Compatibility

FreeDOS, MS-DOS, PC-DOC, SvarDOS, IBM OS/2 and others are compatible.

Long File Names are supported through the DOSLFN TSR on plain DOS, or natively on Windows 95, Windows 98, and Windows Me.

Windows System Requirements

• 386 CPU
• 12 MB RAM
• Win32c Compatibility

Windows 9x, Windows NT 3.50, Windows NT 3.51, and Windows NT 4.0 are compatible.

Program Variants

Variant	Features	Oldest DOS	Oldest Windows	CPU	RAM	HDD	Optimizations
7za.exe for Win32c	All		Windows 95 or Windows NT 3.50	386	12MB	1,203 KB	686 Texan
7za.exe for DOS	All	DOS 3.3	Windows 95	386	12MB	1,260 KB	686 Texan
7zr.exe for DOS	Most	DOS 3.3	Windows 95	386	8MB	642 KB	686 Texan
7zm.exe for DOS	Some	DOS 3.3	Windows 95	386	4MB	317 KB	386 Size
7zdec.exe for DOS	None	DOS 3.3	Windows 95	386	2MB	45 KB	386 Size

System Sizing

• 7zr.exe is the best choice for distribution.
• Use 7zdec.exe in boot media and embedded solutions.
• Use 7zm.exe on computers that have an actual 80386 processor made in the 1980s, or in places where 300 KB of payload space matter.

Texan Mode

All wcc386 compiler optimizations are enabled in Texan mode.

• [-6r] Emit 386 instructions ordered for a 686-class CPU
• [-oh] Repeat optimizations
• [-ot] Prefer faster products
• [-oe] Expand functions inline
• [-ox] Balance optimizations for space and time
• [-oa] Relax pointer alias checking
• [-on] Use numerically unstable floating point arithmetic
• [-ob] Predict branching
• [-ol] Tune loops aggressively
• [-ol+] Unroll loops
• [-or] Schedule instructions