Z80-MBC2 is a 4 chip Z80 system using a Mega32a to provide I/O and via the Mega access to a uSD card. Z80 > 8MHz cpu, Mega32A, 128k x 8 RAM, 74HC00 and optionally an MCP23017 16 bit parallel port via I2C.
It has virtual disk images for CP/M2.2, CP/M3 and an implementation of UCSD IV included in the latest SD image.
UCSD disk is 1.2 Mega bytes as up to 77 tracks x 128 sectors @ 128 bytes in a 1232 Kb file, It actually configures the UCSD volume as 2400 blocks (so part of a track is not used).
The system comes with 2 such volumes: #4:SYS1 & #5:SYS2? (uSD files DS3N20.DSK & DS3N21.DSK)? It supports up to 6 Volumes: #4, #5, and? #9 to #12.
One can create additonal volumes (9-12) by copying a DS3N2x.DSK file to DS3N22 - 25.DSK UCSD will complain of duplicate volumes, but using Zero you can change the size of the extra volumes and fix the duplicate volume label problem. The files remain as 1.2 Mbyte but UCSD will work with any size you Zero them to. I have created 360 Kb (720 block) and 720 Kb (1440 block) #9 and #10. These seem to work fine but the uSD file remains at 1.2 Mbytes and are still not accessible to CiderPress.
So far I have not managed to successfully transfer files to / from it. Ciderpress does not understand the disk structure and other files I have created using Ciderpress are not recognised as UCSD volumes by it.
Under the P-System I can use filer to Zero a volume and set it to 494 blocks, However, the SD remains at 1.2 Mbytes.
Any suggestions on how to move files into / out of the system?
Thanks
Peter
