The Marathon RackMac TS 750/275 was a professional-grade rack-mountable Mac clone, introduced in February 1998. Designed for institutional and enterprise environments, it featured a 275 MHz PowerPC 750 (G3) processor upgrade card, up to 256 MB of RAM, and a 4 MB IX-Micro Twin Turbo video card, all encased in a 4U rack-mountable chassis with a lockable front panel.
Like other Marathon models, the TS 750/275 was built on the Tsunami architecture, allowing it to support Mac OS versions up to 9.0 (officially up to 8.1). With dual processor upgrade capability, 6 PCI slots, and SCSI-II drives, this machine was geared for scalable, secure Mac deployments.
Marathon RackMac TS 750/275 – Technical Specifications
| Component | Specification |
|---|---|
| Model | Marathon RackMac TS 750/275 |
| Architecture | Tsunami |
| Form Factor | Marathon Rack (4U 19″) |
| Processor Type | PowerPC 750 (G3) |
| Processor Speed | 275 MHz |
| Backside Bus Speed | 183.3 MHz |
| System Bus Speed | 45.83 MHz |
| FPU | Integrated (PowerPC 750) |
| Processor Upgrade | Daughtercard (supports dual CPUs) |
| Level 1 Cache | 64 KB |
| Level 2 Cache | 1 MB (backside) |
| Data Path | 64-bit |
| ROM Size | 4 MB |
| RAM Type | 70 ns 168-pin DIMM |
| Standard RAM | 32, 64, 94, or 256 MB |
| Maximum RAM | 1040 MB |
| Motherboard RAM | 16 MB |
| RAM Slots | 8 |
| Video Card | IX-Micro Twin Turbo with 4 MB VRAM |
| Maximum VRAM | 8 MB |
| Hard Drive | 2.1 GB SCSI-II |
| CD-ROM | 8X |
| Floppy Drive | 1.44 MB (manual eject) |
| Modem | Not included |
| Ethernet | AAUI, 10Base-T |
| Expansion Slots | 6 PCI |
| Expansion Bays | 1 (5.25″ external), 2 (3.5″ internal) |
| Battery Type | 3.6V Lithium |
| Built-in Display | None |
| Supported Mac OS | 7.5.3–7.6.1, 8.0–9.0 (officially supported up to 8.1) |
| Dimensions (HxWxD) | 7.0 x 17.25 x 17.75 inches |
| Weight | 42 lbs |
| Original Price | $4500–$6000 USD |
Built for Rackmount Power and Security
The Marathon RackMac TS 750/275 delivered Mac OS functionality in secure, professional IT environments. It stood out with its lockable front panel, modular RAM options, and rack-optimized dimensions. With interleaved RAM support, SCSI-II throughput, and robust G3 processing, the unit excelled as a server, workstation, or network node in critical deployment zones.
