Re: Disassembly of the Z80 ROM of the C128

From: geneb <>
Date: Tue, 28 Feb 2017 07:06:49 -0800 (PST)
Message-ID: <>
On Tue, 28 Feb 2017, smf wrote:

> On 27/02/2017 14:43, geneb wrote:
>> On Mon, 27 Feb 2017, smf wrote:
>>> According to bill herds talks the z80 boot rom was hand assembled by the 
>>> wife of the cpm developer, because they needed it urgently and he was out 
>>> at the time.
>> Not the ROM, but the BIOS.
> What do you mean?

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.


Proud owner of F-15C 80-0007 - The only one of its kind. - Go Collimated or Go Home.
Some people collect things for a hobby.  Geeks collect hobbies.

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Received on 2017-02-28 16:00:02

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