enrico
Experienced Member
I would like to implement CP / M or similar with DUAL SIDE DUAL DENSITY disk management and eventually a new BIOS on the following two boards:
A) Clone Bigboard (MK83) equipped with 4MHz Z80A, 32x4116 RAM, Z80ASIO, 2x2716 EPROM and FDC 1797. The board has unknown firmware with entry table to F800H.
B) Bigboard clone (Fabio) equipped with Z80B, 8x4164 RAM, 1x2732 EPROM and FDC 1797. The board has unknown firmware with entry table to F800H.
I have another clone card with Z80 at 2.5MHz, 32x4116 RAM, Z80ASIO, 1x2732 EPROM and FDC 1771. The card has CP / M 2.2 and Russel Smith firmware with entry table to F000H.
Copying the firmware of this card to eprom to be inserted in the first two ones they performe loading the CP / M but of course only in single density.
Thanks in advance for any suggestions.
Enrico
A) Clone Bigboard (MK83) equipped with 4MHz Z80A, 32x4116 RAM, Z80ASIO, 2x2716 EPROM and FDC 1797. The board has unknown firmware with entry table to F800H.
B) Bigboard clone (Fabio) equipped with Z80B, 8x4164 RAM, 1x2732 EPROM and FDC 1797. The board has unknown firmware with entry table to F800H.
I have another clone card with Z80 at 2.5MHz, 32x4116 RAM, Z80ASIO, 1x2732 EPROM and FDC 1771. The card has CP / M 2.2 and Russel Smith firmware with entry table to F000H.
Copying the firmware of this card to eprom to be inserted in the first two ones they performe loading the CP / M but of course only in single density.
Thanks in advance for any suggestions.
Enrico