nedoPC.org

DESCRIPTION:

◦ Manufacturer: homemade by GG

◦ Model's name: Z80/AM95 8-bit NANO COMPUTER

◦ Typology: training minicomputer

◦ Number produced: 1

◦ Country of Origin: Italy

◦ Year: 2008-2010

◦ Style: vintage 1980's original components on perfboard

◦ Price: $-- (Not for sale)

◦ Ultimate aim: hobby and recreation, educational, chip-oriented retrocomputing,
DIY electronics, 'Homebrewing' (designing and building of retro-styled computers)
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SPECIFICATIONS:

◦ Processor: Z80 (MK3880P-10 8 bit CPU, ceramic purple, 2.5 MHz, -40° to +85°C)

◦ CPU Datacode: 1980

◦ CPU Speed: 2.5MHz, 4 Hz, instruction stepping

◦ Co-processor: AM9511 ( C8231A 16 bit Arithmetic Processing Unit @ 2.5MHz)

◦ Co-processor capability: 16-Bit Integer, 32-Bit Integer, 32-bit Floating Point. In addition to the four basic operations, AM9511 can implement transcendental functions.

◦ Data bus width: 8 bit

◦ RAM: 16K SRAM (or 8K NVRAM + 8K SRAM)

◦ ROM: 8K Eprom (or 8K E2prom)

◦ Storage: NVRAM and/or external IBM PC disk equipment

◦ Display: six chars numeric red LED 7-segment display (TFK CQX87),
eight chars ASCII red LED 16-segment display (DL2416),
COKIN P003 filter to enhance LED's light

◦ Sound: on board 555 chip tone generator (seven notes of the major scale) with speaker

◦ OS: 8BASIC (C) an interpreted BASIC dialect resident in ROM : 3 Commands, 51 Stetements (of which 23 floating point mathematical functions) ; machine code (HEX)

◦ I/O Ports: bidirectional RS232 Serial Interface (USART 8251),
bidirectional PC IBM LPT parallel port (nibble mode 8255 PIO with software ACK),
memory mapped 8 bit parallel I/O

◦ Error detecting mode: RAM test (bit-to-bit memory and adjacent cells),
ROM test (checksum control),
Serial communication (parity bit, buffer size control and checksum control),
Parallel communication (software acknolegment and checksum control)

◦ 16 bit Checksum algorithm (c):
CheckSum = 65535 - Sum [(CheckSum [t0] + 8bit Data [t+1]) Mod 65280]

◦ Input: on-board hex keypad (74C923),
Dip-switches for binary programming

◦ Software on CD-ROM: Serial & Parallel interface communication with an IBM PC (running in Visual Basic for Windows XP using inpout32.dll and MSCOMM32.OCX)

◦ BIOS PROM programming: built-in hardware and software burner for EPROM and E2PROM, equipped with ZIF sockets

◦ Briefcase Computer Case for Z80 machine

◦ Circuit protections: fuse, voltage regulators, schottky diodes in reverse bias, 1.5KW transient voltage suppression (TVS) diodes

◦ Power Supply : 220 V - 20 VA
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77 photos, 2 videos | 7,338 views
items are from between Sep 2009 & 31 Aug 2010.

Year: 2008-2010

Type: CPT 8515
Manufacturer: CPT
Technology: uP i8080, CP/M 1.2
128K RAM
Year: 1980