Re: Differences between 8501R1 and 8501R4

From: smf <smf_at_null.net>
Date: Sat, 7 Dec 2019 14:23:19 +0000
Message-ID: <6edd371f-dd86-568c-a1fc-10b51795c52e_at_null.net>
Interesting, my poor addled brain thought the extra two bits couldn't be
read back.

The 6510-1 & 6510-2 do actually have all 8 data bits.

http://archive.6502.org/datasheets/mos_6510_mpu.pdf
<http://archive.6502.org/datasheets/mos_6510_mpu.pdf>

But then what is weird is the data sheet says hmos, not nmos. So maybe
this is actually the 850x??

I still think it's strange they couldn't fit the extra bits in the 8500,
when they were able to on the 8501 & 8502

On 06/12/2019 19:41, Frank Wolf wrote:
> No that's not correct. The 6510 already had 8 bits of which only 6
> were bonded.
>
> I also did a side-by-side comparison of theĀ  8500<->6510 some time ago
> and they are 100% identical
>
> apart from the outer perimeter were the buffers/drivers reside.
>
Received on 2020-05-29 23:47:19

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