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

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 <========= reply separator ==========>