P112
The P112 single board computer was designed by David Brooks and was last available in kit form in 1996. In 2004, David Griffith made arrangements to issue new P112 kits. Three 'Beta' kits were assembled and debugged in late 2005, and new software development efforts began.
The original operating system software is still available here. It includes all source code for the ROM, BIOS, and a few utilities.
The new system software can be downloaded here. Included is a fully-configured Z-System with ZSDOS, ZCPR3, all source code, and numerous Z-System utilities. The only configuration item still necessary is to define your terminal capabilities with a Z3TCAP file. The downloaded file is an image of the system disk; DD.EXE is used to write the image to a formatted floppy (also available here.)
P112-GIDE
The original GIDE (Generic IDE) interface was designed by Tilmann Reh of Germany. This webpage contains the latest information. The GIDE added 16-bit IDE disk I/O capability to a generic Z80-based computer. The P112-specific version described here does the same thing, but is specifically designed to accommodate the expansion connector and mounting holes of the P112 and the Z80182 CPU. It provides 16-bit I/O to your 'typical' IDE drive, along with the software necessary to format and partition the drive. Also included is Hal Bower's B/P BIOS, a Banked and Portable BIOS that can make use of the entire 1MB address space of the P112. With the current-version ROM and B/P BIOS, the GIDE is the primary P112 cold-boot device.
The P112-GIDE has also been tested satisfactorily with a 128MB Compact Flash-IDE adapter in place of a hard drive, and is maybe a little faster. A 64MB Compact Flash module is recommended; larger is OK, but probably unnecessary. A second CF adapter can also be used in a master-slave configuration.
A dual-GIDE adapter setup has been configured and tested. The BIOS does not support a secondary adapter, but certain utilities do. The CDZSWP program has been modified to allow reading/copying CDROM contents via the secondary adapter, and a BACKUP/RESTORE program is being written to copy/restore the primary Master to/from the secondary Master or Slave. The primary Slave device can also be used for backup purposes.
Production Status and What's New
UPDATE: The Stack Mainboard is final. Photos available here. All prototype work is complete. Ordering information will be updated soon.
UPDATE: A new CPU/Motherboard system is under development. The CPU and Dual GIDE boards have been finalized. Check the Updates page for further details.
I have a couple of CF-IDE adapters available with 512MB CF modules.
Orders are shipped as they arrive. You can request specific information via e-mail by clicking here.
The website is open for ordering via e-mail. All kit prices have been lowered; international shipping now has two options - see the Services page.