Changes
(infos taken from wikipedia)
http://it.wikipedia.org/wiki/NEC_PC-6001
*6001 : no built in mass data storages
*6601 : Floppy disk interface and drive
*CPU : PD 780C-1, seems to be Z80 clone with various clocking, according to video system.
*Co-CPU : PD8049
*Year : 1981
*CPU clock : 3,9936 MHz
*RAM :16KB (max 32K)
*ROM : 16KB Basic, 4KB caratteri
*Graphics :
**128x192x4(/15 colours)
**256x192x2(/15 colours)
**Text mode : 32x16
*Sound :AY-3-8910
*Built-in Peripherals :
*Basic and firmware :N60(Microsoft 16K)
==PC-6001 MK2 and PC 6601==
*Year : 1983
*CPU clock : 4 MHz
*RAM : 64KB or 64KB + 1KB (floppy interface)
*ROM :32KB Basic, 32KB caratteri kanji, 16KB generatore caratteri(modo 4), 16KB sintesi vocale
*Graphics :
**160x200x15 (/15 colours)
**320x200x4 (/15 colours)
**Text mode : 40x20 (40x25?)
*Sound :AY-3-8910, speech synthetiser (japanese)
*Built-in Peripherals :6601 : 1 Floppy 1D singolo lato
*Basic and firmware :N60(16 e 32K RAM), N60 Extended(16 e 32K RAM), N60m (64K RAM)
==PC-6001 MK2 SR and PC6601 SR==
*Year : 1984
*CPU clock : 3,58 MHz
*RAM : 64KB or 64KB + 1KB (floppy interface)
*ROM :32KB N66SR Basic, 32KB N66 Basic, 32KB caratteri kanji, 16KB generatore caratteri(modo 5), 32KB sintesi vocale
*Graphics :
**320x200x15 (/15 colours)
**640x200x4 (/15 colours)
**Text mode : 80x25
*Sound : FM synthesis, speech synthetiser (japanese)
*Built-in Peripherals : 6601 SR : 1 Floppy disk 1DD singolo lato, doppia densità
*Basic and firmware :N60, N60 Extended, N66, N66 SR
=CPC related?=
Just check the specs from the PC-6001 MK2 and the PC-6601.
Those are basically Amstrad CPCs with extra sound capability and less video modes and palette.
