Re: Hardware emulation of 6509 using 6502?

From: Steve Gray <sjgray_at_rogers.com>
Date: Wed, 7 Mar 2018 01:18:17 +0000 (UTC)
Message-ID: <1891191927.9256222.1520385497252@mail.yahoo.com>
The Max Machine uses a 6566 VIC-II chip (which uses SRAM rather than DRAM). Early documentation of the CBM-II series (source code) also mentions use of the 6566. However, released machines use the 6567, which leads me to believe that both were developed at almost the same time. The CBM-II series and the C64 are also very close, and were announced at the same time, unfortunately delays in the CBM-II line release make it seem much later.
In my B-Series prototype: Commodore CBM-II B-Series Prototype Computer, which so far is the earliest known CBM-II machine, the 6509 CPU is dated 2282 (22nd week of 1982), the SID is 1382, and the 6526 is 0882
Steve

      From: Michał Pleban <lists@michau.name>
 To: cbm-hackers@musoftware.de 
 Sent: Tuesday, March 6, 2018 5:10 PM
 Subject: Re: Hardware emulation of 6509 using 6502?
   
smf wrote:

> The design is horrendous, fortunately they sorted it out when they did
> the c64.

I am not sure what was the actual timeline here? Was the P500 or 64
developed first? The CPU part numbers (6509 vs. 6510) might suggest that
the B series were designed first, but the MAX Machine (which is the true
ancestor of the 64) was being sold some time before the B series was
even announced.

Regards,
Michau.


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Received on 2018-03-07 03:00:03

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