am95 photos on Flickr

My fourth training Z80 board, completed with vent power supply, Z80 ceramic purple Mostek-Zilog CPU, ROM 8K (Bios plus main programs), RAM 8 + 8K (SRAM or NVRAM) , SIO RS-232 USART 8251, PIO 8255, 25 pin IBM PC Standard Parallel Port bidirectional nibble mode interface, additional memory mapped 8bit parallel I/O, E2/Eprom programmer via HW bit-to-bit or SW with ZIF sockets, programmable tone generator (555 as orgue), Hex keyboard (74C923), Hex LED Display, ASCIII 16 segment LED Display (DL2416), 3 Clocks types ( 2.5MHz; 4 Hz; instruction stepping), dip switches for interrupt Zero Mode, Windows Visual Basic Software for serial & parallel data transmission between the Z80 and an IBM Personal Computer. Quite all components are vintage original 1980's

Z80/AM95 NANO COMPUTER: COMPONENT PERSPECTIVE by G.G. (Italy)

4 1

Z80/AM95 NANO COMPUTER: Expansion Card with AM9511 by G.G. (Italy)

5

Homemade Z80/AM95 8-bit NANO COMPUTER in a briefcase by G.G. (Italy)

5 2

Z80 - Reverse of the Board (perfboard) by G.G. (Italy)

5 2

Reverse of the board (connections are soldered).

My Z80/AM95 8-bit NANO COMPUTER FINAL RELEASE by G.G. (Italy)

4 2

Retro vintage DISPLAY SECTION with red filter by G.G. (Italy)

2

Adding a red filter really enhances the LED display contrast.

am95 close up of the sweat by Steve

3

hot trainers n sweaty sox

am95 sweaty trainers after a run by Steve

1 1

hot trainers n sweaty sox

OG Nike Air Max 95 Neon Yellow by Gooey Wong

6 1

MILITARY CPU Z80 MOSTEK by G.G. (Italy)

2

Arithmetic Processor AMD AM9511 vintage original by G.G. (Italy)

3

AMD produced what is probably the first floating point "coprocessor" for microprocessors, the AMD 9511 "arithmetic circuit" (1979), which performed 32 bit (23 + 7 bit floating point) RPN-style operations (4 element stack) under CPU control.

________________________________________________________________

AM9511 APU (arithmetic processing unit) performs floating point calculations that would be too time-consuming or cumbersome if done on Z80 microprocessor.

In addition to the four basic operations, the 9511 can implement transcendental functions (sin, log, etc.), and it can also perform conversion from floating point to fixed point and vice versa. It can also perform operations in 16 or 32 bit fixed point two's complement integer representation.

The fastest instruction is 16 bit fixed point addition which takes 4 microsec, the slowest instruction is arc-tangent which takes almost 2 milisec; 32 bit floating point addition takes 14-87 microsec.

The 9511 is an autonomous processor: it acts like a peripheral and it in not tied to any particular microcrocessor. AM9511 is configured as a pair of I/O ports with the capability of causing the Z80 to pause for completion of the processor's operation if it has not been completed by the time the Z80 code requires the results.

The 9511 is a stack orientaded processor. Operands are first pushed onto the internal stack, and then a comand is issued to the processor to perform an operation on the stack. Results are removed from the stack.

All transfers, including operands, results, status and command information, take place over an 8-bit bidirectional data bus. The internal data paths and the internal ALU are 16 bits wide, even though some operations are on 32 bits operands (this fact indicates that extending the 9511 to handle double precision format could have been implemented internally quite easily). The transcendental functions are evaluated using Chebyshev Polynomials which provide an even distribution of errors within the selected data representation.

The 9511 was in 1980's an high cost device: the APU was far more complex than the CPU and the volume of sales was not so high. As a result this was reflected in the price: in 1983 the Am9511@2Mhz cost £90 (considering inflation it would cost £240 now in 2009), the 3Mhz £123.75, the 4Mhz £146.25 ..

Air max 95 junior size 6 by odarallo

4 6

am95 5 by Steve

2

hot trainers n sweaty sox

A ZIF socket also for the CPU ... by G.G. (Italy)

2 1

Briefcase Computer Case for Z80 machine by G.G. (Italy)

3

Z80 CPU MOSTEK (1980) by G.G. (Italy)

3

MK3880P-10 (Z80 CPU)

§ Purple Ceramic

§ 2.5 MHz

§ -40° to +85°C

§ Data code: 1980

Here is protected by a transparent plexiglass window

Mostek cut a deal with a startup Zilog, in which Mostek provided fab resources to manufacture the Zilog microprocessors in return for second sourcing rights to the Zilog family. Mostek produced MK3880, the Zilog Z80 and a series of Z80 support chips, until Zilog built their own fab.

Rare 1980 Mostek MK3880P-10 Z80 CPU by G.G. (Italy)

3

MK3880P-10 (Z80 CPU)

§ Purple Ceramic

§ 2.5 MHz

§ -40° to +85°C

§ Data code: 1980

Here is protected by a transparent plexiglass window

Mostek cut a deal with a startup Zilog, in which Mostek provided fab resources to manufacture the Zilog microprocessors in return for second sourcing rights to the Zilog family. Mostek produced MK3880, the Zilog Z80 and a series of Z80 support chips, until Zilog built their own fab.

Z80/AM95 NANO COMPUTER: the two boards in one shot by G.G. (Italy)

2

Z80/AM95 NANO COMPUTER: COMPONENT PERSPECTIVE by G.G. (Italy)

3

APOLLO181 HOMEMADE TTL CPU by G.G. (Italy)

4 1

APOLLO181 is a homemade didactic CPU made of bipolar logics and memories, characteristic of the TTL Bugbook® era in 1970s

Enjoy the project at

ygg-it.tripod.com/

Technology:

TTL Schottky (1974 Bugbook® era technology)

Data word size:

4-bit

Instruction word size:

8-bit

On-board RAM:

256 byte

On-board ROM:

64x16 bit

ALU type:

74181

Number of basic instructions:

16

Addressable memory locations:

256

Clock frequency:

2,5 MHz single phase

Clock cycles per instruction:

4

Interrupt levels (max):

256 without RTI

Number of internal registers:

16

Number of I/O ports (max):

16

Number of integrated circuit:

59

Board size:

300 x 300 mm (11,8 x 11,8 in.)

On board Power Supply (V/I)

5V/ 3500 mA (40VA transformer)

APOLLO181 has been conceived and assembled in Italy in 2012 by Gianluca G. (author of the homemade Z80/AM95 microcomputer) using early 1970s TTL technology. Designed and tested with the aid of a hardware simulator, APOLLO181 is running today at 2.5 MHz on a 12x12 inches single perfboard.

APOLLO181 is a multi-chip board and its peculiarity is that all the employed TTL components were described in the Bugbook® I & II (LOGIC & MEMORY EXPERIMENTS USING TTL INTEGRATED CIRCUITS, written by Dr. Peter R. Rony © 1974, 1st edition), as a Gianluca G.'s personal tribute to these books. By happy coincidence we are also approaching the 40 years Bugbook® publication anniversary.

TFK CQX 87 Seven-Segment Numeric LED Display by G.G. (Italy)

2

TFK CQX 87 KG

CQX87K

Vishay Telefunken

Seven-Segment Numeric LED Display - Com Ka

Package Style (Basic)=DIP

Number of Characters=2

Color=Red

Character Height (mm)=13

Peak Wavelength (m)=660n

Iv Min.(cd) Luminous Intensity=300u

@I(F) (A) (Test Condition)=20m

V(F) Max.(V) Forward Voltage=2.0

@I(F) (A) (Test Condition)=20m

I(F) Max. (A) Forward Current=25m

Status=Discontinued

Package=DIP

Explore

Language

View allAll Photos Tagged am95

Tags am95

View allAll Photos Tagged am95