Lmst

Current brain squirrel: #RCA #CDP1802 #COSMAC processors and hardware that used them.

A System For The Sixties: The RCA Studio II

https://nicole.express/2024/radio-keith-orpheum.html

#computers #retrocomputing #microprocessors #games #technology #rca #cosmac #chip8

A square plastic box with a 4x4 keypad, small square TV, and a cassette recorder against a gradient background. Text reads: COSMAC VIP: $249 gets the entire family into creating video games, graphics and control functions For starters. COSMAC VIP, the completely assembled, read-to-operate RCA Video Interface Processor, opens up a whole new world of computer excitement. New challenges in graphics, games and control functions. Yet it's just $249.00. Soon RCA will offer options for color graphics and 256 tone sound generation. An optional auxilliary keyboard will open up an exciting world of two-player games.

My CDP1802-equivalent RTL core can run at 166 Mhz in an XCKU5P Kintex Ultrascale+ FPGA (-1 speed grade). Given that my core takes exactly 1/8 as many clocks per instruction as a real CDP1802, this means that it will run at the equivalent speed of a 1.33 GHz CDP1802.
The real CDP1802 typically ran at 2.0 to 3.2 MHz.
#fpga #cdp1802 #cosmac

Repórter Retro 104

https://retropolis.com.br/2024/06/26/reporter-retro-104/

#ReprterRetro #Allejo #Amiga #Asianometry #ATAIDE #BancoDeDados #BASIC #Bloodfest #CasualRetroGamer #Centurion #COSMAC #CPM #CRT #Dartmouth #DavesGarage #dBASE #DBASEIII #DiscoRgido #EDS #EngenhariaReversa #Grficos #HappyLittleDiodes #IBM #IEEE #Jogos #KariLawler #LCD #Linux #Livros #MSDOS #MSX #Netware #Novell #OldComputersSucked #PCTools #PhintageCollector #ProteoContraCpia #Python #RetroGamesRediscovered #RetroH

"The COSMAC (Complementary Symmetry Monolithic Array Computer) is an 8-bit microprocessor family introduced by RCA. It is historically notable as the first CMOS microprocessor."

"Successors to the 1802 [ . . . ] have [ . . . ] enhanced features [ . . . ] There are also some minor pin function changes, but the line continues to be produced in its original 40-pin dual in-line package (DIP) format."

en.wikipedia.org/wiki/RCA_1802

That's pretty cool! Just learned about the #COSMAC from @requiem 's comment hackers.town/@requiem/11209580… .
8-bit CMOS microprocessor

🌘 COSMAC VIP 的 Chip-8 字符集 - Laurence Scotford
➤ COSMAC VIP 的 Chip-8 字符集分析
✤ https://www.laurencescotford.net/2020/07/19/chip-8-on-the-cosmac-vip-the-character-set/
本文分析 COSMAC VIP 電腦上 Chip-8 解釋器的字符集。Chip-8 字符集是一個精心設計的 sprite 集合，讓程式師能夠使用 DXYN 指令顯示這些字符。
+ 這篇文章對 COSMAC VIP 的 Chip-8 字符集進行了詳細的分析，對於想要了解這個老式電腦的程式設計和操作的人們非常有用。
+ 這篇文章的總結是非常精簡的，但仍然保留了原文的主要內容和意義。
#Programming #Retro Computing #chip-8 #COSMAC VIP

@vertigo for some reason I constantly mix-up SPI & i2c...

But regardless, my #rc2024 is going to be based on the #COSMAC (a much cooler name than "RCA 1802" or whatever) because I like it weird.

@freakazoid

I have other projects that should take precedence but I couldn't help myself. I put one of the #COSMAC #ELF boards on the workbench and entered the traditional test program which simply flashes the Q LED. Absolutely chuffed to see it working first try!

#VintageComputing / #RetroComputing

@trithorn I'd argue that there are people better positioned to make good use of this. I didn't know anything about the #COSMAC 1802 stuff until today. I'm excited to learn more about it. I've been reading a lot already and what I HAVE learned is that the 1861 Pixie graphics chip is really hard to find right now so I'm glad that at least one of the two systems in the box has the chip present.

It's alive! "Flash Q LED" code from the book working as it should #cosmicos #cosmac #cdp1802

Veroboard with ICs, more or less in the original layout of the Cosmicos. It's running the "flash Q LED" code from the book, with input showing E0 active, LED display showing 00.

Back of the veroboard Cosmicos showing an insane amount of hand wired soldered connections in a variety of colours.

In the early 80s I came across the 1802-based Cosmicos in a book at the local library. I hand copied the schematics from that, which I recently came across. I decided to finally build it. I probably could have recreated the pcb, although that would have been expensive. So hand wiring it is. The data and address busses will be erm… interesting to do. #cosmac #8bit

Partially populated veroboard with switches and ICs. Some LEDs light up, and two 7-segment displays show FF.

Back of the veroboard showing colored wiring.

Repórter Retro 093

https://retropolis.com.br/2023/06/28/reporter-retro-093/

#ReprterRetro #6800 #68000 #AdrianBlack #Aesthedes #AlsGeekLab #AnotherBoringTopic #AtariSt #AugustoBaffa #BBS #BenZotto #BITNET #Commodore64 #ComputaoGrfica #COSMAC #Doom #ethernet #FitaCassete #Hackaday #Holanda #HUG1802 #Intel #Jogos #LinguagemC #MicroCoreLabs #microsoft #ModernVintageGamer #Mouse #MSX #Multibus #NostalgiaNerd #NovaZelndia #os2 #PCXT #RCACDP1802 #recap #RetroRio #RNP #SID #SnteseDeVoz #Sphere #T

A new (non-radio) project: a #COSMAC-ELF RCA 1802 based microcomputer that fits in an Altoids tin. 1970’s computing in the palm of your hand complete with flippy switches and blinky lights. http://www.sunrise-ev.com/1802.htm

The unassembled parts of an 1802 Membership Card microcomputer kit are shown.

Repórter Retro 090

https://retropolis.com.br/2023/03/29/reporter-retro-090/

#RepórterRetro #6502 #8-BitResurgence #ActionRetro #adrianblack #anime #Arcade #Assembler #Assembly #Austrália #bug #Commodore128 #Commodore64 #Commodore900 #consoles #COSMAC #Cromemco #DennisRitchie #fliperama #fusion-C #GEOS #HTML #IBM #internet #Japão #Kokusai #LinguagemC #mostechnology #MrLurch #MS-DOS #MSX #MSXSJC #MSXVDP #NECPC-9801 #Obituário #PCXT #PlayChoice-10 #PowerPC #programação #Protótipo #RCACDP1802

Queen Victoria’s Secret (Teletype and COSMAC Elf)

We don't really think anyone in the Victorian era had a COSMAC Elf -- the homebrew computer based around the RCA 1802 CPU. But if they did, it might have looked like [Daniel Ross'] steampunk recreation of the system that includes an appropriate-looking teletype device. You can see the thing in a series of videos, below. There are actually quite a few videos showing different parts of the system, along with several blog postings stretching back a few months.

A magic eye tube doesn't look out of place in this build. We especially liked the glass tube displays and the speaker, although we thought the USS Enterprise looked out of place with the technology based on stone knives and bearskins, to paraphrase Mr. Spock. On the plus side, the VFD displays have the right glowing look, although a Nixie would have been pretty good there, too.

The videos don't have much detail, but the blog posts do if you wanted to attempt something similar. Honestly, 1802 system design is pretty easy thanks to the its on-chip DMA that allows you to load memory from switches with no actual software like a monitor. The teletype started out life as a Remington #7 from around 1900, although another newer machine donated parts to get everything working. It is a testament to how well things were built then that it took as much abuse as it did and still has working parts.

We have a soft spot for the 1802 -- it was a very good design for its time. We've even gone as far as to simulate it.

#retrocomputing #1802 #cosmac #cosmacelf #steampunk #vintagecomputer

Multithreading? Virtual memory? Supervisor mode? Floating point? Multiply and divide? All unnecessary! The 1802 doesn't even have a subroutine call. Or a dedicated PC register.

https://en.wikipedia.org/wiki/RCA_1802

As for computers, well, they certainly don't need sound. Or video. Or keyboards. See Lee Hart's membership card:
http://www.cosmacelf.com/gallery/membership-cards/

You *do* need blinking lights though.

#cosmac #retrocomputing #frontpanel #blinkenlights

@vidak @bhtooefr

#COSMAC

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