[Patch] 8088 Zenith Data SupersPORT

Post Reply
User avatar
Posts: 16
Joined: Thu 03 May, 2018 6:36 pm
Location: Germany

[Patch] 8088 Zenith Data SupersPORT

Post by Tux »

Finally I got the [8088] Zenith Data SupersPORT running...

The problem was the very special memory handling of this machine.
The SupersPort has a so called Scratchpad RAM. It is used by the Monitor program to temporarily store intermediate information used by the CPU and BIOS.
It is located from F0000H to F3FFFH in upper memory.
The BIOS (therefore) starts at F8000H, not as usual at F0000H.

Using the BIOS "z184m v3.1d.10d", you boot into the Monitor program ("MFM-180 Monitor, Version 3.1D").
Typing "?" gives a short help, typing "b" continues to boot from the first floppy disk.

Recommended configuration: CGA video, 640 KB memory, Floppy 3,5 '' 720K.
I got MS-DOS 3.21 to start. There is also a (DOS-compatible) Zenith-DOS version floating around...

Note: The patch is against plain PCem v14 (!).
With the latest development version some adaptations are necessary, as BIOS loading was moved out of mem.c to mem_bios.c.
However, everybody who uses the development version should be able to handle this ;)
(8.66 KiB) Downloaded 204 times
User avatar
Site Admin
Posts: 1886
Joined: Thu 24 Apr, 2014 4:18 pm

Re: [Patch] 8088 Zenith Data SupersPORT

Post by SarahWalker »

Merged at rev 1206. I did rework the memory mapping a bit.
Post Reply