CBM Disk Transfer Benchmark v1.1

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• Create Date July 8, 2026
• Last Updated July 8, 2026
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CBM Disk Transfer Benchmark v1.1 By Obliterator918/Strate (2021)

Standardize your Commodore 64 disk speed testing.

Stop relying on manual smartphone stopwatches. DTB provides accurate, repeatable benchmarks of KERNAL SAVE and LOAD performance on serial devices 8–11 (1541, SD2IEC, Ultimate 64, etc.).

Key Features

• Measures real KERNAL routine execution time using the CIA Time-of-Day clock (accurate on both PAL and NTSC systems).
• Tests a consistent 44,956-byte (177-block) data file.
• Reports Bytes per Second (Bps) and a DTB Score — how many times faster than a stock C64 + 1541 with original KERNALs.
• Baseline scores:
  • SAVE: 369 Bps (1x)
  • LOAD: 400 Bps (1x)
• Easy one-key operation:
  • F1: Cycle device (8–11)
  • F3: KERNAL SAVE benchmark
  • F5: KERNAL LOAD benchmark
  • F2: Read drive error channel
  • F7: TOD clock test / verification

Ideal For

• Comparing fast loaders, JiffyDOS, custom KERNALs, SD2IEC, RAMLink, CMD HD, Ultimate 64 DMA, and other storage solutions.
• Getting reliable “how much faster?” numbers without guesswork.

Simple, lightweight, and precise — perfect for retro computing enthusiasts who want trustworthy disk transfer metrics.

-Sutehk