Re: FPGATED

From: smf <*smf_at_null.net*> Date: Sat, 23 Jul 2016 22:45:30 +0100 Message-ID: <b4e6537a-2052-64ab-531b-2a5fdd018a56@null.net> · smf_at_null.net

Even more interesting. The november 1982 datasheet says the 6510 is nmos 
but the other data sheet says hmos.

On 23/07/2016 22:35, smf wrote:
> On 23/07/2016 20:08, Segher Boessenkool wrote:
>> Why do you think you can set all port bits on the 8500? 
>
> Interestingly the preliminary 6510 datasheet has a different pinout 
> that includes all 8 bits on the io port.
>
> http://archive.6502.org/datasheets/mos_6510_mpu_nov_1982.pdf
>
> The later datasheet lists three chips (6510, 6510-1 & 6510-2). The 
> former is the c64 pinout, the other two have all 8 bits on the io port.
>
> http://archive.6502.org/datasheets/mos_6510_mpu.pdf
>
> So at least on the 6502, I would expect it to be a bond out issue. 
> However If you can't read back what you've written to outputs then the 
> sense lines aren't connected to the output buffers, or there may not 
> be output buffers on the missing bits. It would seem odd for them to 
> create masks for each pin configuration, but then we don't know that 
> these chips were even produced.
>
>
>
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