106 Results for "68000"

How fast is this thing, anyway ?
Log from Kobold K2 - RISC TTL Computer
It is interesting to know how the performance of the Kobold K2 compares to well-known processors. I did compare it to: AVR (16 MHz)6502 (2 MHz)68000 (8 MHz)8086 (10MHz) Summary If you don't have the time to read the whole log, here are the results for...

1617 SPAL analysis
Log from Applix 1616 Documentation
U24 ("SPAL") - the expansion bus interface logic Pins 1 and 2 go low at the I/O space (A23 to A8 are high). A7-A1, R/W, and /LDS are basic 68000 signals. The manual states that the memory map looks like this: $FFFFFC1 R/W ZDATA Read: Data...

Lots and Lots and Lots of Fake v9958
Log from MSX1 Homebrew Clone for Baffa-2 Project
Hi folks, bad news. The retro market is flooded by rebranded v9958 fake chips. I bought six already from different Aliexpress stores and all came with the same serial and "notch". As we know, the package of yamaha v9958 has no...

A Long, Long Overdue Update
Log from MC68000 Computer
Quick story. I brought this computer to the Vintage Computer Festival 9.1 last year to show Bil, Dave, and all the other cool people at the event. At the time, I was freerunning the processor, watching the blinkenlight count up. Great stuff, and proof...

Paradigm Shift
Log from Reverse Engineering Soneplex SPX-MPU SBC
(This is continuation of my previous log on what I've done up to a year ago.) My first approach was to understand how SPX-MPU handles file upload and run. If successful, I'll be able to load and run my own software. This is desirable because...

Instruction set !
Log from Kobold - retro TTL computer
This is a first design for the instruction set. In the final computer, the instruction set could be changed any moment by putting a new microcode in the Flash microstore. This instruction set borrows from the 68000, PDP-11 and SPARC ! Here are the registers:...

More SRAM than TS2
Log from Retro 68000 CPU in an FPGA
The resource utilization in the 5CEFA2F23 FPGA Card is: There's more than enough left over block memory to have 128KB of SRAM. The only complication is that the TS2 memory map wasn't designed for more than 32KB. That is because it places the...

Testing the External SRAM
Log from Retro 68000 CPU in an FPGA
Now that we have a working GCC toolchain, let's write a program to test the External SRAM. Need to use the patch that fixes the timeout for srecord loading. Using this patched version of the srecord file. I'm using a GitHub repo to transfer...

Hello World
Log from Reverse Engineering The Weather STAR 4000
So up until this point, I had no knowledge or prior experience writing any 68K program C, ASM or otherwise. My background in programming up to this point was Visual Basic 6/VBScript and microcontroller ASM, as that's what I grew up with, VB being...

WIP Status Update
Log from Merlin
So we have a good system up and running and what is left to do? We have now in place: TG68 68010 running at 100mhz with a double-precision FPU.Console via telnet over ethernet.16mb DDR3 with a L2 cache.Gameduino, OPL3 and SDCard via SPI interfaces.RTC...

Background
Log from T030
I got the idea for this project when I found my old Z80 Single Board Computer in the attic. It turned out that it actually still works, and I suddenly remembered how great a learning experience it was to design and build it from scratch, making a lot...

Running on Off-the-Shelf Card(s)
Log from 68K CPU with Frame Buffer on FPGA
Also, got the code running on the the QMTECH EP4CE15 FPGA "Starter Kit". Details here. Specifications On-Board FPGA: EP4CE15F23C8N;On-Board FPGA external crystal frequency: 50MHz;EP4CE15F has rich RAM resource;EP4CE15F has 15K logic cells;On-Board Winbond...

New board
Log from 68000 minimal homebrew computer
Fuzix Unfortunately, the 128KB RAM is too little for the system to run Fuzix. In theory, I could change the board a bit and swap the 32KB RAM chips for 512KB RAM. But every time I looked at the wires at the back of the board, I'm too afraid I will permanently...

Expansion Bus
Log from Y Ddraig - My 68000 Computer
There are 4 expansion slots on the board. Each slot is using a 64-pin DIN 41612 connector. The connector supply data, address and some common bus signals as well as power to each of the boards. There are also 2 select signals for each slot, all access...

Stuart's system
Log from Applix 1616 Documentation
Stuart is restoring a 1616 machine and documenting his progress at: https://forum.acms.org.au/t/retrochallenge-2023-10-applix1616-restoration-documentation/503/4 He has read the PAL chips using a ChipTester V2 Pro from BackBit.io and I eagerly...

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