Chromatix wrote:
Mouser prices a W65C02S at $7 - plus shipping & handling. The latter could raise the perceived price rather a lot over the nominal one, even if the order also contains some glue logic chips and a breadboarding kit. It really is enough to make a novice think "I don't need a 14MHz 6502, maybe a second-hand one that runs at 1MHz or so would be cheaper." And they're not yet experienced enough to know the finer differences that come with it, nor how to distinguish a counterfeit from the genuine article, nor where to reliably obtain the latter at a reasonable total cost.
- And: I have 110 6512 microprocessors I bought in the mid-1980's for a project I never went through with, to make an inexpensive SBC for education, hobby, and light industrial applications. The 6512 is a 6502 whose Φ1 pin is an input rather than an output, and you would normally drive the Φ0 and Φ1 inputs using both the Q and Q\ outputs of a 74xx74. The 6512 also has a DBE (data bus enable) pin (pin 36). The data sheet says, "This input allows external control of the three-state data output buffers and will enable the microprocessor bus driver when in the high state. In normal operation DBE would be driven by the Φ2 clock, thus allowing data output from microprocessor only during Φ2." It also says this external-clock version is "geared for the multi-processor system applications where maximum timing control is mandatory." (It can be used in a single-processor system too though of course.) Make me a reasonable offer for some or all of them. I could sell them one at a time, but I prefer not to.
