78h-7Bh (alias 7Ch-7Fh) - Memory page select registers. In such case CP/M should be warm rebooted. This can be used by the OS to detect floppy disk change. Bit 7 - Disk Changed (DC) output from floppy drive. This port should be read following FDC data transfer command (read, write, format, etc.) to properly terminate data transfer. Read - Pulse FDC's /DACK and TC control lines. Write - FDC Diginal Output Register (DOR), also known as latch. 31h (aliases 33h, 35h, 37h) - FDC Data Register. 30h (aliases 32h, 34h, 36h) - FDC Main Status Register. 28h (aliases 29h - 2Fh) - FDC CCR Register. See Interrupts section for Zeta SBC V2 specific CTC implementation and programming notes. 20h - 23h (aliases 24h - 27h) - CTC Registers. 
Zeta SBC V2 - Gerber - 2.0.zip Input/Output Ports
Zeta SBC V2 - Schematic - Color - 2.0.pdf PCB Version 2.0
An easy way to get a "taste" of CP/M era computing.įile downloads are at the bottom of this page. PCB mounted connectors, no need to build cables. Easy to use flash memory instead of UV EPROM. Although it should work with 5.25" drives too. Assumes using commonly available 3.5" floppy drives (not many people have 5.25" drives and even less 8" ones). Footprint of an 3.5" floppy drive (100 mm x 170.18 mm) and PCB can be mounted under a 3.5" drive. Zeta SBC V2 is compact and easy to build: Western Digital WD37C65, SMC FDC37C65, or GoldStar GM82C765B floppy disk controller. Z80 CTC - can be used to generate periodic interrupts, and as an interrupt controller for UART and PPI. 8255 PPI - can be used for attaching a ParPortProp board, a hard drive using PPIDE or controlling some external devices. Zeta SBC V2 features following components: Replace with Zeta SBC V2 when available.) Zeta SBC with ParPortProp and a Floppy Drive And lastly it is made using CMOS technology and more power efficient than FDC9266 Pictures Complete Board 
Additionally 37C65 FDC is easier to obtain than FDC9266. Compared to FDC9266 used in Zeta SBC it integrates input/output buffers and floppy disk control latch. It adds Z80 CTC which is used for generating periodic interrupts and as a vectored interrupt controller for UART and PPI. Compared to the first version this version features updated MMU with four banks, each one of those banks can be mapped to any 16 KiB page in 1 MiB on-board memory. Zeta SBC V2 is a redesigned version of Zeta SBC.
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