Questions tagged [65c02]

for questions about the 65c02 microprocessor

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8 votes
5 answers
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Is the W65C02S TTL-compatible?

According to the Western Design Center (WDC) W65C02S datasheet, table 6-2 on p.24, Vih on all inputs is VDD x 0.7 = 3.5 V when running the CPU at 5 V VDD. This is somwhat above the level at which it ...
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5 votes
0 answers
361 views

Transistor-level schematic of 65C02

I am looking for a transistor-level schematic for the 65C02, something like the one for the 6502 created by davidmjc (https://github.com/davidmjc/6502). I am a teacher planning to give a student ...
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21 votes
3 answers
4k views

What happened to the 65832?

In his June 1985 foreword to Programming the 65816 by David Eyes and Ron Lichty, Bill Mensch expresses his hopes for a 6502-derived 32-bit microprocessor: the 65832. WDC is still thriving, but the ‘...
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3 votes
3 answers
504 views

Interrupt pin type on the 6502

I have a really basic question. I have to design an 65C02-based personal computer for a school project. I have to draw my own footprint for the 65C02. My question is what type of pin is the IRQB (...
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4 votes
1 answer
225 views

65C816: Inputs TTL-compatible?

New 65C816 datasheets say that Vih (for the data bus in particular) is 0.8Vdd, i.e. not TTL-compaible. Old data sheets (for example, the one published in Apple IIgs Hardware Reference) say that at 5V ...
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15 votes
3 answers
627 views

What are the normal signals on a 65C02 in an Apple IIe?

I'm troubleshooting a dead Apple IIe enhanced, and I'm having trouble finding documentation on testing the 65C02 (as opposed to the 6502). Specifically, I've found using a logic probe that pin 6 (...
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