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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.
There is a reason why I re-sprayed this VIC-20. It was soooooo yellow. No retr0bright solution was available at the time.
When I was spraying the machine, I ran out of paint. You can still see some of the original colour around the edges. Im going to get another can of paint soon and finish the job. Need to get rid of a couple of finger prints too! :)
Dont forget to checkout www.retrocomputers.eu for more info about my retro computer collection.
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.
Puzzles, tests and problems to improve your skills.
Please take a look at www.retrocomputers.eu for more info about my retro computer collection.
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
This program (written in Visual Basic) let my Z80 NANO COMPUTER communicate with an IBM PC Computer. You can choose either a serial or a parallel transmission for both the directions.
This 60 sec. video demo will show both Serial and Parallel transmission (TX and RX respectively)
In the demo the software will import the Assembly code from a third-party PC Z80 Simulator and then transmit it from the PC to the Z80 NANO COMPUTER ram. This trasmission in this demo is serial (RS-232). A 16 bit checksum is calculated on both the machines, transmitted to the Z80 machine and there checked. Serial transmission allows also a parity checking control. Then the program will re-import data from the Z80 to the PC, via parallel transmission this time. I have choosed a slow 10 ms handshaking to let you see the data while imported. A 16 bit checksum is calculated on both the machines, transmitted from the Z80 to the PC and here checked.
Hexadecimal data are manually copied from the program and pasted in a notepad to show you that data have been sent and received in a correct way.
One of my hobbies is collecting retro-computers, focusing on computers made by Atari. I have currently have eleven different Atari-models, three from Commodore and one other model in my collection.
The Commodore 64 was probably the dream computer for most kids in the early 1980ies. It outperformed most of the contemporary home-computers when it came to graphics and sound in 1982, however the BASIC interpreter was anything but impressive.
Lived in a veritable desert when it came to computer technology in in 1983, if memory serves me correct the VIC 20 me and my four year older brother got for Christmas in 1982 was bought in Stockholm, the capital of Sweden, 450 km south of us, we were a bit lucky when a local store mostly sold office equipment like type writers and office computers decided to also sell home computers in form of Commodore 64. My brother and his friend spent much time during the summer of -83 there playing the limited amount of games that were available at the time, then later nagging on our parents to get one for Christmas. So by using most of my and my brothers savings, and selling the VIC 20 we got our precious Commodore 64 for Christmas in 1983.
A few years later we also acquired a 1541 disk drive, as far as I can remember it costed as much as the computer had in 1983. Today you get a quite decent laptop for that kind of money.
I sold mine in 1989, so this is not the one I had back then.
The seven trimmers (all connected to a 555 oscillating circuit) are tuned to play the seven musical notes (Major Scale). The two quad analog/bilateral switch 4016 select the appropriate resistor, according to a seven bits word. The last bit is used to activate or mute the sound. The amplifier is just a simple general purpose low-power amplifying transistor (2N2222A).
◦ Co-processor manufacturer: AMD (AM9511) or Rochester Electronics replacement, licensed by Intel (c) 1980 (C8231A).
Rochester Electronics is licensed and authorized by semiconductor manufacturers to provide a continuing manufacturing source for mature/discontinued products.
AM9511 APU performs floating point calculations that would be too time-consuming or cumbersome if done on Z80. 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.
A portable DVD player with a video input jack provided a handy test screen for ELF2K's vintage PIXIE (RCA1861) graphics chip output.
Running an 1802 machine code routine using EF1 sync (not interrupts) to display 36 characters from a message buffer.
Identification plate on Burroughs TD700 Self-Scan early gas plasma display screen with main control unit and keyboard. Design Level (DL) 4 c1973.
Although the control unit identity plate is stamped for 240 volts, the power supply test points for 5.1v, 12v, -12v, 30v, and -250v were all up to required values on 110 volts AC supply from the variac..!
Please take a look at www.retrocomputers.eu for more info about my retro computers and Raspberry Pi collections.
Commodore Amiga 500, Commodore Amiga 1081 monitor, The Arcade joystick, Hitachi boombox. And the Settlers!!!
I picked up a silver Game Boy Advance SP at a carboot sale for £4, but it was very scratched. So I bought a replacement case off eBay for £6.
The Game Boy now looks brand new.
Please take a look at www.retrocomputers.eu for more info about my retro computer collection.
For more information about The National Museum of Computing , visit www.tnmoc.org
Please take a look at www.retrocomputers.eu for more info about my retro computer collection.