my own designed booklet covers for rca cosmac 1802 microprocessor
March 16, 2026 at 8:44 PM
my own designed booklet covers for rca cosmac 1802 microprocessor
solar powered cosmac computer
February 24, 2026 at 6:11 PM
solar powered cosmac computer
COSMAC Elf Turns 50
COSMAC Elf Turns 50
Hackaday Article
hackaday.com
September 5, 2026 at 5:06 AM
COSMAC Elf Turns 50
Polaroid of an RCA COSMAC VIP demonstration booth (1977)
From the Hagley Digital Archives
From the Hagley Digital Archives
December 14, 2025 at 9:59 PM
Polaroid of an RCA COSMAC VIP demonstration booth (1977)
From the Hagley Digital Archives
From the Hagley Digital Archives
Nyt ihan vähän itkettää. Kirjoitin muutaman byten COSMAC 1802 assembleria sisään vipukytkimillä; parin sadan juotoksen jälkeen tuo toimii 🥹 Tämä olisi pitänyt saada 9-vuotiaana eikä mitään valmista Commodorea 😆
May 3, 2025 at 6:18 PM
Nyt ihan vähän itkettää. Kirjoitin muutaman byten COSMAC 1802 assembleria sisään vipukytkimillä; parin sadan juotoksen jälkeen tuo toimii 🥹 Tämä olisi pitänyt saada 9-vuotiaana eikä mitään valmista Commodorea 😆
some overlooked microcomputers hitting the big 50 in 2026:
1. NEC TK-80 (August 3, 1976)
2. COSMAC ELF (August 1976)
3. iasys inc. ia7301 Computer in a Book (1976)
4. Compucolor 8001 (December 1976)
1. NEC TK-80 (August 3, 1976)
2. COSMAC ELF (August 1976)
3. iasys inc. ia7301 Computer in a Book (1976)
4. Compucolor 8001 (December 1976)
January 5, 2026 at 4:50 AM
some overlooked microcomputers hitting the big 50 in 2026:
1. NEC TK-80 (August 3, 1976)
2. COSMAC ELF (August 1976)
3. iasys inc. ia7301 Computer in a Book (1976)
4. Compucolor 8001 (December 1976)
1. NEC TK-80 (August 3, 1976)
2. COSMAC ELF (August 1976)
3. iasys inc. ia7301 Computer in a Book (1976)
4. Compucolor 8001 (December 1976)
my RCA 1802 / COSMAC ELF collection
October 25, 2024 at 5:24 PM
my RCA 1802 / COSMAC ELF collection
BRB gonna build the cosmac elf
May 19, 2025 at 3:15 AM
BRB gonna build the cosmac elf
challenged myself to assemble Lee Hart’s smallest COSMAC computer, the MemberCHIP Card, essentially a COSMAC ELF with no input switches, a ROM monitor, RCA BASIC3, serial output, and 32K static RAM.
it fits within an Altoids Smalls tin!
it fits within an Altoids Smalls tin!
October 4, 2025 at 11:31 PM
challenged myself to assemble Lee Hart’s smallest COSMAC computer, the MemberCHIP Card, essentially a COSMAC ELF with no input switches, a ROM monitor, RCA BASIC3, serial output, and 32K static RAM.
it fits within an Altoids Smalls tin!
it fits within an Altoids Smalls tin!
i’m building the original COSMAC ELF design from a newly made PCB by Emilio Aoi
October 18, 2024 at 12:01 PM
i’m building the original COSMAC ELF design from a newly made PCB by Emilio Aoi
A Cosmac VIP signed by Joyce Weisbecker!
September 8, 2024 at 11:02 PM
A Cosmac VIP signed by Joyce Weisbecker!
Avaruussukkula oli viileintä mitä tiesin 10v:nä vuonna 1981. (Ok, oli myös se yksi Peppi-lettinen tyttö.) Mutta vasta nyt rakensin COSMAC 1802-tietokoneen jota myös sukkulassa käytettiin 🥰
May 2, 2025 at 10:03 PM
Avaruussukkula oli viileintä mitä tiesin 10v:nä vuonna 1981. (Ok, oli myös se yksi Peppi-lettinen tyttö.) Mutta vasta nyt rakensin COSMAC 1802-tietokoneen jota myös sukkulassa käytettiin 🥰
The People's Computer at 50! The COSMAC ELF
YouTube video by Tech Time Traveller
youtu.be
August 31, 2026 at 5:05 PM
RCA COSMAC Game Manual II
RCA VP-720 (1980)
Cover illustration of the second COSMAC VIP game and program manual. Games were typed in through the VIP’s hex keypad, or saved and loaded through cassette tape.
Printed August 1980
RCA VP-720 (1980)
Cover illustration of the second COSMAC VIP game and program manual. Games were typed in through the VIP’s hex keypad, or saved and loaded through cassette tape.
Printed August 1980
July 22, 2026 at 9:21 PM
RCA COSMAC Game Manual II
RCA VP-720 (1980)
Cover illustration of the second COSMAC VIP game and program manual. Games were typed in through the VIP’s hex keypad, or saved and loaded through cassette tape.
Printed August 1980
RCA VP-720 (1980)
Cover illustration of the second COSMAC VIP game and program manual. Games were typed in through the VIP’s hex keypad, or saved and loaded through cassette tape.
Printed August 1980
happy 50th anniversary to the COSMAC ELF, designed by Joseph Weisbecker! my favorite microcomputer platform to tinker with.
i’ve built many ELFs and clones over the past two years. this CPU is the first CMOS CPU, and was used in NASA’s Galileo spacecraft, as it is low-power.
i’ve built many ELFs and clones over the past two years. this CPU is the first CMOS CPU, and was used in NASA’s Galileo spacecraft, as it is low-power.
August 2, 2026 at 6:49 PM
happy 50th anniversary to the COSMAC ELF, designed by Joseph Weisbecker! my favorite microcomputer platform to tinker with.
i’ve built many ELFs and clones over the past two years. this CPU is the first CMOS CPU, and was used in NASA’s Galileo spacecraft, as it is low-power.
i’ve built many ELFs and clones over the past two years. this CPU is the first CMOS CPU, and was used in NASA’s Galileo spacecraft, as it is low-power.
Game of Life program timelapse for the COSMAC VIP, code by Ben Hutchinson.
Original machine code published in Ipso Facto Issue #6 (June 1978)
Original machine code published in Ipso Facto Issue #6 (June 1978)
September 8, 2025 at 12:06 AM
Game of Life program timelapse for the COSMAC VIP, code by Ben Hutchinson.
Original machine code published in Ipso Facto Issue #6 (June 1978)
Original machine code published in Ipso Facto Issue #6 (June 1978)
new CHIP-8 setup!
i now have an SD ELF II card and VIP hex keypad that can put my AVI ELF II into an RCA Cosmac VIP-compatible mode.
portable b/w TVs pair so well with the CDP1861’s 64x32 graphics.
i now have an SD ELF II card and VIP hex keypad that can put my AVI ELF II into an RCA Cosmac VIP-compatible mode.
portable b/w TVs pair so well with the CDP1861’s 64x32 graphics.
June 1, 2025 at 6:56 AM
new CHIP-8 setup!
i now have an SD ELF II card and VIP hex keypad that can put my AVI ELF II into an RCA Cosmac VIP-compatible mode.
portable b/w TVs pair so well with the CDP1861’s 64x32 graphics.
i now have an SD ELF II card and VIP hex keypad that can put my AVI ELF II into an RCA Cosmac VIP-compatible mode.
portable b/w TVs pair so well with the CDP1861’s 64x32 graphics.
hey kid (tosses you a quarter) why don't you go an build the cosmac elf
May 19, 2025 at 3:25 AM
hey kid (tosses you a quarter) why don't you go an build the cosmac elf
COSMACもやっています。
kanpapa.com/cosmac/
kanpapa.com/cosmac/
COSMAC研究会
1970年代のCOSMAC CPU(RCA CDP1802)でレトロなマイコンシステムの実験をしているCOSMAC研究会です。
kanpapa.com
February 13, 2024 at 10:06 PM
COSMACもやっています。
kanpapa.com/cosmac/
kanpapa.com/cosmac/
From the Twitter archives - My first Retro Festival from 2017. The luxury of two tables!! That year, I took some modern clones. A Superboard II, Apple 1 (x2), Cosmac ELF and a SCELBI 8B
November 14, 2024 at 11:10 PM
From the Twitter archives - My first Retro Festival from 2017. The luxury of two tables!! That year, I took some modern clones. A Superboard II, Apple 1 (x2), Cosmac ELF and a SCELBI 8B
December 31, 2025 at 2:34 AM
Mouse Trap (1978) by Dan Rubis
Type-in game for the COSMAC ELF (1976), with the CDP1861 PIXIE chip. Fits under 256 bytes of RAM. Game machine code is displayed above playfield on the 64x32 screen.
Object of the game is to capture the 🐁 inside a 📦 made of 4 pixels. Records if you capture or miss.
Type-in game for the COSMAC ELF (1976), with the CDP1861 PIXIE chip. Fits under 256 bytes of RAM. Game machine code is displayed above playfield on the 64x32 screen.
Object of the game is to capture the 🐁 inside a 📦 made of 4 pixels. Records if you capture or miss.
February 27, 2025 at 9:19 PM
Mouse Trap (1978) by Dan Rubis
Type-in game for the COSMAC ELF (1976), with the CDP1861 PIXIE chip. Fits under 256 bytes of RAM. Game machine code is displayed above playfield on the 64x32 screen.
Object of the game is to capture the 🐁 inside a 📦 made of 4 pixels. Records if you capture or miss.
Type-in game for the COSMAC ELF (1976), with the CDP1861 PIXIE chip. Fits under 256 bytes of RAM. Game machine code is displayed above playfield on the 64x32 screen.
Object of the game is to capture the 🐁 inside a 📦 made of 4 pixels. Records if you capture or miss.
The CDP1802 is a 8bit CMOS processor introduced by RCA back in 1976. It is fully static meaning the clock input can be stopped, saving power without affecting registers/status. Famously, it was used on the Galileo spacecraft. Since it's nearly Christmas, 2nd photo is a COSMAC ELF ... on a shelf 😉
December 11, 2024 at 8:22 PM
The CDP1802 is a 8bit CMOS processor introduced by RCA back in 1976. It is fully static meaning the clock input can be stopped, saving power without affecting registers/status. Famously, it was used on the Galileo spacecraft. Since it's nearly Christmas, 2nd photo is a COSMAC ELF ... on a shelf 😉
Happy to have helped a bit with the background history for this game, written for the hobbyist Cosmac Elf computer. Every excuse to help tell the cool story of Joe Weisbecker and the 1802 microprocessor is a good one!
Next on All the Adventures:
Come for a tale that leads from 1949 all the way to 1981, with passionate developers trying to bring computers to the masses, and an obscure game called Tiny Adventure, a complete "outsider work" in computer game history.
#history
bluerenga.blog/2025/06/04/t...
Come for a tale that leads from 1949 all the way to 1981, with passionate developers trying to bring computers to the masses, and an obscure game called Tiny Adventure, a complete "outsider work" in computer game history.
#history
bluerenga.blog/2025/06/04/t...
Tiny Adventure (1981)
Today’s story is complicated, as it involves multiple threads converging at a central moment during the history of computing. THREAD 1: Edmund Berkeley You might think the first personal comp…
bluerenga.blog
June 5, 2025 at 4:34 PM
Happy to have helped a bit with the background history for this game, written for the hobbyist Cosmac Elf computer. Every excuse to help tell the cool story of Joe Weisbecker and the 1802 microprocessor is a good one!