#kramermc — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #kramermc, aggregated by home.social.
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Early Sunday was used to solder the last lines of the #KramerMC memory expansion. All lines are beeped, correct and not shorted. Now I have to wait for my memSIM2, which is in repair in the moment. The voltage regulator was melted, no one knows exactly why.
#RetroComputing #FormerGDR #KitComputer #ZilogZ80 #U880 -
Productive evening. Most of the work is done for the #KramerMC memory expansion. It only lacks of the voltage and controlling lines. But data & address bus are connected. Have to beep it out before doing a first test, maybe on Sunday.
#RetroComputing #64kB #FormerGDR #KitComputer -
Thanks to @breakintoprogram for his youtube introduction how to program a GAL22V10. I decided for this way and against multiple 74LS chips. I did not find a good documentation about galasm, the link inside the github project is dead. Is it possible to use braces within the expression?
D0-D7 and A0-A10 are wired at the #KramerMC memory expansion. Rest has to be decoded. -
After some searching I found the problem in #KramerMC. The #DS8286 on the cpu board gets in the way. In addition, it is installed incorrectly because the inputs and outputs are bridged. When I leave the socket empty it runs fine. Wonder if the computer ever worked the way it was intended.
Since I still had two of the plug-in contacts for the bus system in stock, I'm starting to build a RAM expansion to 64k. With address decoding to spare out 0000-0fff (ROM 2732) and 0fc00-ffff (display RAM). Because of the simplicity I decided to use 64k static RAM.
I'm also curious if the buddy might bring a new CPU board today, I'll be surprised.
#RetroComputing #Z80 #U880 #FormerGDR -
The #KramerMC is doing things 😀 I've no idea whats going wrong with it at the weekend. Have changed nothing, but now my small "Write chars to screen buffer" is working well. Sorry for the wrong orientation, but seems to be automatic.
And btw the selfmade new circuit board is ordered.
#RetroComputing -
You like some #KramerMC news? After the last try it doesn't work properly again. Which doesn't surprise me with the catastrophic condition of the CPU board. I'm tired of looking for broken wires/cuts again and again. We decided that a colleague in the museum would etch the whole thing again from scratch. And I would then build a "new old" one, of course with the original parts.
At the moment I'm revising the layout scanned in 1200 dpi in GIMP. It's always a bit of a loss when it's 35 years old and printed on extreme eco-friendly paper.
#RetroComputing #Zilog #U880 -
Where are empty EPROM if I need them?? Want to reprogram the character set ROM of the #KramerMC but none of my 2716 is empty 🤔 I should make a batch deletion of all inside the "can be used" box further.
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Today's afternoon in the museum wasn't really successful at all. I carried my EPROM simulator (memSIM2) with me to make a few tests with the real #KramerMC. But the beast wasn't thankful using it after a sleep of two years. Nothing broke, but it doesn't do what it supposed to do. A small test program filling the CRT memory with various characters. But I used the time and revised my git repo so that now all required programs under DOS and Linux with their instructions are part of it.
But I won't give up that easily. But the others asked me what I would do if one day the computer ran without errors 😂
#RetroComputing #Zilog #Z80 #U880 -
Said and done. No problem to compile "The Macroassember AS" under #Debian. Only needs a "cp Makefile.def.tmpl Makefile.def" before starting make. It's worth a closer look, by the way, because it can generate binaries for dozens of microprocessors. Absolutely impressive:
http://john.ccac.rwth-aachen.de:8000/as/cpulist.html
#RetroComputing #KramerMC #Z80 #Assembler -
After a long time I decided to take another look at our #KramerMC. I made good progress tonight and I think I'm on the right track. I can compile a downloaded listing using "The Macroassembler AS" on Windows. Since this is available in the source code, it should also be possible to create it under Linux. Then start #JKCEmu - simply the best, only needs Java - as an alternative ROM.
#RetroComputing #Zilog #Z80 -
@Rp12Biker There must be a few people out there that know and use the #KramerMC as support for it was incorporated in to z88dk in 2020
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Now I'm curious who knows the #KramerMC, or more uncommon who has ever seen one in real life.
At the end of the 1980s, a book by #ManfredKramer was published by the military publishing house of the GDR. It described how to build your own computer based on the 'Zilog' #U880 CPU. The book goes into many details, including monitor listings, circuit board layouts and technical details.
The example on the pic comes from the person who developed the circuit board layouts at the time. It has a personal dedication from Manfred Kramer and so it appears to be No. 2 of the KramerMC. In parts it is still usable, at least its display preparation is working again after extensive repairs.
#RetroComputing #GDR #Zilog #Z80 #ComputerMuseum -
I'm everytime impressed about https://z88dk.org and all the supported platforms. Started as a tool for implementing a TCPIP stack easier with C for the #SinclairZ88.
Now it supports such niche computers like #VZ200, my #EpsonPX8 and - yes! - the #KramerMC in the museum. -
I'm everytime impressed about https://z88dk.org and all the supported platforms. Started as a tool for implementing a TCPIP stack easier with C for the #SinclairZ88.
Now it supports such niche computers like #VZ200, my #EpsonPX8 and - yes! - the #KramerMC in the museum. -
I'm everytime impressed about https://z88dk.org and all the supported platforms. Started as a tool for implementing a TCPIP stack easier with C for the #SinclairZ88.
Now it supports such niche computers like #VZ200, my #EpsonPX8 and - yes! - the #KramerMC in the museum. -
I'm everytime impressed about https://z88dk.org and all the supported platforms. Started as a tool for implementing a TCPIP stack easier with C for the #SinclairZ88.
Now it supports such niche computers like #VZ200, my #EpsonPX8 and - yes! - the #KramerMC in the museum. -
I'm everytime impressed about https://z88dk.org and all the supported platforms. Started as a tool for implementing a TCPIP stack easier with C for the #SinclairZ88.
Now it supports such niche computers like #VZ200, my #EpsonPX8 and - yes! - the #KramerMC in the museum.