Re: Disassembly of the Z80 ROM of the C128

From: geneb <>
Date: Wed, 1 Mar 2017 05:51:02 -0800 (PST)
Message-ID: <>
On Wed, 1 Mar 2017, smf wrote:

> On 28/02/2017 15:06, geneb wrote:
>> Patches that were done were applied to the BIOS, not the ROM. Keep in mind 
>> that under CP/M, the BIOS is loaded off of disk and isn't ROM-resident. 
>> CP/M is kind of a stack.  The BDOS, the BIOS, and the CCP. The BDOS is the 
>> same for every CP/M system.  The BIOS is modified to match the hardware 
>> that CP/M is running on, and the CCP is basically equivalent to COMMAND.COM 
>> in DOS - it's transient.
> The phone call was about the boot ROM for the Z80, that worked out whether to 
> go into C64 mode or C128 mode. Before that call the 6502 started first & it 
> tried to handle the mode switch, but that caused a problem with the magic 
> voice cartridge.
Must not have been the story I was thinking of then.

> It had nothing to do with CPM.

It's CP/M. :)


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Received on 2017-03-01 14:00:02

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