Talk:MOS Technology 8502

Differences from the 6510: The 8502 has an extra I/O-pin and lacks the PHI2-pin. This should be listed on this page (since it talks about the evolution from the 6510).

The pinout is incorrect

The on-chip parallel port pins are P0 through P4 inclusive and then P6 and P7. There is no P5. The digits the in labels correspond directly to the bit positions in the bytes at locations $0000 and $0001 used to interact with these pins.

Sunplus 8502

After looking at the reference for the HP35s, I question whether the Sunplus 8502 is the same as the MOS/CSG 8502. It appears that the Sunplus model is a microcontroller that includes ROM, power management and an LCD driver. The MOS 8502/CSG 8502 never had any of that. So, unless somebody can confirm that the Sunplus version is the same as the MOS version, or even a 650x derived chip, the section should be deleted. -- Dinjiin (talk) —Preceding undated comment added 22:49, 1 July 2009 (UTC).[reply]

The Sunplus is NOT the same thing. See this disucssion. Maury Markowitz (talk) 16:26, 5 October 2020 (UTC)[reply]

Was that the only actual change?

Looking over this article, it seems the only change to the 8502 was the I/O port. Yes, it could run at higher speed, but so could any B-model 6502, like the ones Atari and BBC used. Is there anything special about the 8502 in this regard? Did it respond to clock changes faster, for instance? Maury Markowitz (talk) 15:38, 31 October 2019 (UTC)[reply]

The original 6502 came in three versions...

This paragraph is incorrect. The original 6502 ran at 1 MHz. As the process improved 2 MHz could be achieved and these parts were sold as the 6502A. There was never a 6502B; possibly the writer is getting confused with the 68B00? Also there was never a 6502C; there was a 65C02, but it was a much later chip on a CMOS process with a completely different design, and rated clock speeds 1, 2, 3 or 4 MHz. 81.102.25.109 (talk) 06:51, 12 May 2023 (UTC)[reply]