svi-328.dev

New information and research about the Spectravideo SVI-318/328 home computers.

Articles

SVI-608M Expansion Unit — CP/M Hard Disk System Analysis

Analysis of the SVI-608M memory and hard disk expansion unit for the SVI-328. The SVI-608M adds a SASI hard disk controller (Western Digital WD1002-SHD) with a 10 MB Seagate ST-212 Winchester drive, a Centronics printer port, and additional memory — running CP/M 2.27.

Includes:

• Complete CP/M 2.27 BIOS disassembly and boot sequence analysis
• SVI-608M SASI host adapter port map (ports 40h–46h) and bus protocol
• Hard disk partition layout and drive letter mapping
• SVI-609 Bootstrap Card ROM analysis
• MSYSGEN and MFORMAT utility disassemblies
• SVI-328 I/O port reference