23 Results for "MC68000"

MC68000 graphics card
Log from Motorola 68000 computer
This is the shortest log ever, written mainly because a) I'm feeling guilty about not having written a log for so long, and b) to prove that I'm still making progress on the MC68000 computer project.I've already got an ATA (IDE) interface and serial...

MC68000 PS/2 keyboard & mouse interface
Log from Motorola 68000 computer
As usual, it has been a while since my last update. I've been busy working on some new expansion cards for the MC68000 motherboard. It's a bit boring interacting with the system via an RS232 serial port, so I thought I'd build an expansion card enabling...

TUTOR Command Set
Log from Retro 68000 CPU in an FPGA
The Motorola MC68000 Educational Computer Board (MEX68KECB) User Manual has the command set for TUTOR in Section 3.6. Here's a snapshot of the commands:

Upcoming refactoring
Log from Terminal-BASIC
Some OpenSource/DIY software projects, containing legacy C code have been rewritten into C++. There is no any reasons to stay on C if C++ available on target platform. It has everything that C has and many "free" features, which cost 0 extra bytes and...

Loading/Running Tiny BASIC
Log from Retro 68000 CPU in an FPGA
The Motorola MC68000 Educational Computer Board (MEX68KECB) has a Tiny BASIC that is already assembled. Since the card is compatible with my FPGA design it loads nicely. Type LOAD on VDU portWaits on S-records from the ACIA portRunning PuTTY...

Assemble
Log from Merlin
I have ported the Motorola assembler and monitor. The manual is in the files, it is the software from the Motorola MC68000 Educational Computer Board (MEX68KECB). There is a site with more info here: http://www.easy68k.com/paulrsm/mecb/mecb.htmIt...

Test rig
Log from MSX2(+) video to VGA conversion (proof of concept)
The sketch below describes key hardware components of this proof of concept:Propeller proto-boardThis board is out of production, but any proto-board with Propeller can be used. It is convenient that the number of signals that need to be driven is small: 8...

1617 ZPAL analysis
Log from Applix 1616 Documentation
U8 ("ZPAL") - the glue logic for the onboard Z80 microcomputer The Z80’s memory map is as follows 0000H-5FFF H:ROM 6000H-7FFF Common RAM bank H: 8000H-FFFF Switching RAM bank H: So that the Z80 may access all of the possible 64 kbytes of RAM whilst still...

Partial register writes are tricky.
Log from PDP - Processor Design Principles
As noted in the comments of Use registers. by @alan_r_cam, partial registers are a seducing feature. It was born in the 70s when microprocessors were 8-bits wide internally and made 16-bits registers out of pairs of physical byte-wide storage. 16-bits...

LM3671 step-down DC-DC converter: sigh.
Log from Motorola 68000 computer
The following is a rant. If you're not in the mood for reading a rant, please don't bother reading on.So: the LM3671 dc-dc converter. According to its data sheet, "...only three tiny surface-mount external components required (one inductor, two ceramic...

10/100Mbps Ethernet card
Log from Motorola 68000 computer
It has been quite a while since my last update, and the project has moved forward a long way! I’ve made a lot of progress with the operating system software (I’ll be writing a log about this soon) and the hardware has advanced a bit too.I designed a...

Ping!
Log from Motorola 68000 computer
I spent a little while reworking the network stack in the m68k OS code. The idea is to end up with a reasonably generic stack: ideally, like Linux and friends, the OS code shouldn't really care about what kind of network adaptors are plugged in, and...

New Parts!
Log from Z80 Computer
After the HAD article [Brandon Dunson] wrote about Tanner Electronics, and the subsequent realization that I'm only 30 miles away, I had to go check it out. Two hours and $35 later, this project has new life.I picked up a 1.8432 MHz crystal and an oscillator...

Expansion interface
Log from Motorola 68000 computer
This is a short log[*] describing the 16-bit expansion card interface in the 68000 system. I've deliberately kept the design of this interface as simple as possible, in order to make it easy and quick to build expansion cards. I know I could have implemented...

Always Blame The Software (Part One)...
Log from rosco_m68k
It's been a very frustrating couple of days on the m68k project. All my own fault, of course.Some background: I've been hooking up the MC68901 MFP which will give me some GPIO capabilities, a UART (actually a USART but I'm not using the S), some...

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