Physical Computing Mini-Projects
Joined January 2012
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834 Photos and videos
May 24
Testing the Demo program from the IMSAI 8048 Manual using a low cost 4 Channel DC 5V Relay Module from Amazon.
#IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller
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May 24
The IMSAI 8048 can download or upload binary data.
I will use an Arduino to convert the paper tape format into Intel HEX, enabling the use of a serial terminal like TeraTerm, PuTTY, etc.
#IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller
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May 20
Benchy detected!
Doing some tests to use E18-D80NK ir proximity sensors in simple model trains setups with the IMSAI 8048 replica.
#IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller
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May 17
The relay module has arrived—time to test the relay routine from the IMSAI 8048 manual.
#IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller
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May 10
Replacing my vintage microprocessor trainer's RAM with FM16W08 F-RAM is the best way to enjoy those nostalgic routines without having to retype them or deal with the hassle of a cassette recorder or serial terminal.
#IMSAI8048 #D8748H #D8749H #Retrocomputing #vintagecomputers
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May 8
Bringing a rare piece of computing history back to life!
The IMSAI 8048 Control Computer is a total rarity (only about 350 were ever produced) it was overshadowed by the success of the IMSAI 8080.
#IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller
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May 8
Using an online OCR tool to extract the monitor program from the IMSAI 8048 manual, I made some adjustments to use the 2500 A.D. cross-assembler and linker. Everything is going well so far.
#IMSAI8048 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #Microcontroller
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May 3
Finally, everything fell into place—my @vintagechips board is up and running. Time to move on to some others #MCS48-related projects in my stack.
#D8748H #D8749H #INTEL #Retrocomputing #vintagecomputing
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Apr 29
After nearly a month in customs, the LEDs and 7-segment displays finally arrived from Poland...
I have no more excuses not to solder the board from @vintagechips.
#D8748H #D8749H #INTEL #Retrocomputing #MCS48 #vintagecomputing
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Apr 22
Running an Intel 8749 simulator on a Raspberry Pi Pico 2. Assembler monitor program Bit-banging at 9600 bauds. Next up: adding binary/hex file downloads. MONITOR.ASM github.com/jim11662418/Intel…
#Retrocomputing #MCS48 #Intel8749 #VintageComputing #RaspberryPi #ArduinoPico
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Apr 18
Usually, it does not matter which USB-to-TTL interface chip is used by Arduino Nano clones; however, at lower speeds (300–1200 baud), it is always preferable to have the FTDI used by the original Nano.
#Maker #Arduino #Nano #ArduinoNano #Electronics #Hardware #Microcontroller
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Apr 16
Now simulating the 8749 with the #Arduino #NanoR4 . Original Jim11662418's monitor program runs on the 8049 at 10 MHz. Simulation at 1/8 of the speed: 9600 bauds becoming 1200.
github.com/jim11662418/Intel…
#D8748H #D8749H #INTEL #Retrocomputing #MCS48 #vintagecomputing #Arduino
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Apr 13
After several tricks—such as using a LUT in RAM...
I am updating a single byte (8 bits) on the #Arduino #NanoR4 pins four million times per second.
#Maker #Arduino #NanoR4 #Electronics #Hardware #Microcontroller
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Apr 11
Arduino Nano running an 8748 binary ROM!.Accurate machine cycle emulation. Jim11662418's monitor program using bit-banging serial comms. Original speed 10MHz (9600 bauds), simulation 625kHz (600 bauds),
#D8748H #D8749H #INTEL #Retrocomputing #MCS48 #vintagecomputing #Arduino
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Apr 11
The 8748 simulated using an Arduino Nano. Jim11662418's monitor program running on the 8047 at 10 MHz. 1/16 speed simulation: 9600 baud -> 600.
github.com/jim11662418/Intel…
#D8748H #D8749H #INTEL #Retrocomputing #MCS48 #vintagecomputing #Arduino
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Apr 9
I set up a simple 8048 simulator on an Arduino Nano. Here, you can see @vintagechips' DEMO8749 running. It is executing at 16 scans per second. This is likely half of the actual speed.
#D8748H #D8749H #INTEL #Retrocomputing #MCS48 #vintagecomputing
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Apr 5
I'm going to reproduce MCS48 evaluation board from @vintagechips. While I wait for the hard-to-find axial LEDs and 7-segment displays to arrive from Poland, I'm programming the PIC (clock and single-step function).
#D8748H #D8749H #INTEL #Retrocomputing #MCS48 #vintagecomputing
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Apr 1
I replaced the Microprofessor's 6116 RAM with my #FM16W08 FRAM adapter card. It works perfectly, retaining its contents during power-off.
#SDK85 #Microprofessor #retrocomputing #MCS84 #MCS85 #Z80 #MOS6502 #vintagecomputing
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Mar 31
I made my own adapter cards to create a simulated 6116 RAM using the #FM16W08 to retain what I was programmed in my vintage microprocessor trainers
#SDK85 #Microprofessor #retrocomputing #MCS84 MCS85 #Z80
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Mar 21
Only ~350 units of the IMSAI 8048 Control Computer were ever produced, making it a very rare find. My goal is to build a hardware version to get the original ROM running again.
#IMSAI8048 #MCS48 #D8748H #D8749H #INTEL #Retrocomputing #MCS48 #vintagecomputing
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