Re: Video ROM

From: Ray Arachelian <ray.arachelian_at_email.domain.hidden>
Date: Tue, 27 Feb 2007 10:47:57 -0500

The Lisa Emulator does not make use of the video state ROM. This is where the serial number is stored on a real Lisa along with timing information for the VSYNC, HSYNC signals.

The serial number that's the default for the emulator comes from one of my own Lisas. There's no need to crack anything as you can get your Lisa's serial number directly from service mode.

(The emulator will actually correct the checksum portions of the serial number where it can, but this isn't guaranteed to produce a valid serial number - for example, all zeros will not be a valid number.)

All that's needed is any valid serial number for Lisa Office System to run and allow you to install the tools (LisaWrite, etc. The default will work just fine.

You are free to enter the serial number from your own Lisa, which you can find in service mode in memory at 0x240-0x25F. You'll have to remove the extra 0's - either the low nibble or the high nibble if I remember correctly. One of David T. Craig's docs on serialization tells you the exact procedure which escapes me for the moment - part of it contains manufacture data information, another part is a network ID for a Lisa network that wasn't actually sold.

On 2/27/07, lisa_at_email.domain.hidden <lisa_at_email.domain.hidden> wrote:
> Has anybody out there cracked the code on the video ROM? The serial
> number that shows up when you choose 'attributes' of preferences does
> not show up in the actual ROM code. If I remember correctly the
> serial number that shows up in service mode doesn't match either one.

Received on 2015-07-15 16:36:58

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