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#1
General Discussion - Introductions / Re: What computer did you have...
Last post by lightforce6128 - Today at 03:54From CPC 6128 I did a long jump to a 486 DX with 33 MHz, 4 MBytes of RAM, and a SVGA graphics card with a TSENG chipset that could easily be controlled also from BASIC. The storage was done with a 20 MByte hard drive. Also a SoundBlaster was available.
Especially for assembly programming on 486: Every register is an accumulator, every register is 32 bits wide, most commands are executed in a single cycle ... Z80 assembly is so much more complicated. But addressing on Z80 is simple: 16 bit registers, 64 KBytes of memory, and some additional banks to swap in. On DOS you have to work with small memory segments and six segment registers in addition to the register holding the address, also in combination with swapping in everything above 1 MByte. Only in protected mode these limits did no longer exist. But getting there was complicated ...
Especially for assembly programming on 486: Every register is an accumulator, every register is 32 bits wide, most commands are executed in a single cycle ... Z80 assembly is so much more complicated. But addressing on Z80 is simple: 16 bit registers, 64 KBytes of memory, and some additional banks to swap in. On DOS you have to work with small memory segments and six segment registers in addition to the register holding the address, also in combination with swapping in everything above 1 MByte. Only in protected mode these limits did no longer exist. But getting there was complicated ...
#2
General Discussion - Introductions / Re: What computer did you have...
Last post by lightforce6128 - Today at 03:44The first digital thing I owned (or shared with my brother and my father) was a Atari 2600.
#3
Quote from: mbenjami on Yesterday at 17:38I want a M4 board , please send me instructions for buy it.check the first post how to get in touch with Duke.
The prices are probably up since then, but the rest of the information is probably still valid.
#4
Quote from: genesis8 on Yesterday at 21:39Do you have a github or a web site with more informations about the state of your work ?Nope. I just have a messy code on my pc, and messy electronics on a breadboard. I will for sure put everything on GitHub, especially that my knowledge in electronics is really poor, so I would like to get some feedback. But first I need to clean it up at least to the point when code is readable.
As for current status - output is almost OK. Code works well, I was able to display Amstrad palette, or something close to it. I need to experiment more with resistors values to make colors better, e.g. white is a bit greenish. Input in terms of schematics is much more WIP. I am just going to order some new voltage comparators, because old ones were too slow. So far I was testing with only 1 bit per input. Except those limitations with ram, when I was trying to just use 640x200 with no border, it looks ok - just small details to improve like screen is shifted a bit, or problems with catching sync after resetting Pico with Amstrad running. So it should not be much work left.
#5
Quote from: gregg on Yesterday at 18:56Nope... I am more like doing a scandoubler, just the simplified one that assumes Amstrad palette, so it is easy to use just digital pins, voltage comparators on input and 6 resistors on output.ah... in that case the QL project might indeed be close to what you want to do.
I was considering mirroring the ram, but I got scareddouble and triple buffering is just a beginning. What about reading the palette etc. That's too much for me
Well... I am looking forward to it :-)
#6
Do you have a github or a web site with more informations about the state of your work ?
#7
M
Technical support - Hardware related / Re: Blown fuse on EME-156 V dr...
Last post by mikeyp - Yesterday at 21:15Just thought I would update that the fuse swap was successful and the drive is fully working again.
Thank you.
Thank you.
#8
General Discussion - Introductions / Re: What computer did you have...
Last post by roudoudou - Yesterday at 21:14Quote from: cwpab on Yesterday at 19:23i played Androides, a clone of Lode Runner and that's itQuote from: roudoudou on 08:25, 14 April 24was not "mine" but the Thomson T07-70 of the school they left in the storage room. My mum -teacher- brought it at homeVery cool! I find these Thomson machines quite interesting. 5 models, but no compatibility among them, 500K sold in France... And a nice list of mostly French games.
The graphics look cute, did you play any games on it?
the TO7 user manual was even greater than Amstrad user manual to learn programmation in Basic!
there was a Logo cartridge also, very fun to play with
#9
"Retro" in common English means "meant to look old" but it's been adopted by the gaming community to incorporate old machines, reproduction machines and software emulation alike.
#10
Technical support - Hardware related / Re: CPC 6128 - white screen, b...
Last post by McArti0 - Yesterday at 20:55rOm Dis long lasting connected
rAm Dis 1sek.
measuring voltages ... pin14 all memories and write where is ~0V
rAm Dis 1sek.
measuring voltages ... pin14 all memories and write where is ~0V