6501 and 6500/1 (was Re: Revamped Web site up)

From: Richard A. Cini, Jr. <rcini_at_email.msn.com>
Date: Fri Nov 6 17:07:25 1998

OK, I looked at the data sheet:

    "The 6500/1 is a complete, high-performance 8-bit NMOS microcomputer on
a single chip, ans it totally upward/downward software compatible with all
members of the 6500 family."

    "The 6500/1 consists of a 6502 CPU, an internal clock oscillator, 2048
bytes of Read Only Memory (ROM), 64 bytes of Random Access Memory (RAM) and
flexible interface circuitry. The interface circuitry includes a 16-bit
programmable counter/latch with four operating modes, 32 bidirectional
input/output lines (including two edge-sensitive lines), five interrupts and
a counter I/O line."

    "Mask Programmable Options: Internal pull-up resistors on ports A, B, C,
D. Selectable for 8-bit port groups only, not for individual port lines.
Internal pull-up resistor on the CNTR line."

    Kind of sounds like a 6502 and a 6522 rolled together with a small ROM
and some RAM. Other interesting tidbits: no mention of 6800 compatibility;
separate power pin for the internal RAM; five interrupts include reset, NMI,
two edge-sensitive, counter overflow.

    None of the data sheets that I have (not even the "family" ones) mention
a 6501.

Rich Cini/WUGNET
  - ClubWin!/CW7
  - MCP Windows 95/Windows Networking
  - Collector of "classic" computers
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Received on Fri Nov 06 1998 - 17:07:25 GMT