Re: MicroSoft Softcard?

[Patrick Schaefer <pa.schaefer@fz-juelich.de>]

Christopher Rose wrote:

> Would anybody happen to know what the DIP switch settings are? I think
> I got the 2 disks for the thing but when I try to boot it it goes into
> the monitor??? What slot does this thing go in?

I don't remember the right order, but one connects the Slot NMI to the
Z80, one connects Slot IRQ to Z80 INT, and one disables address
translation. The fourth one is just for fun. It was intended to allow
Z80 DMA (use a SCSI card for CP/M), but this never (?) worked

The z80 starts at 0000h after reset, the 6502 uses $00xx for pointers
and $01xx for its stack area. For this reason the Z80 uses translated
adresses. Z80 0000h is in reality $1000 and so on.

A schematic diagram of the Microsoft Z80 Softcard should be somewhere at
apple.cabi.net.


Patrick