Search found 490 matches

by marcelk
19 Mar 2020, 22:54
Forum: Hardware and software hacking
Topic: Python Assembler Query - RAM labels
Replies: 10
Views: 5694

Re: Python Assembler Query - RAM labels

I'm writing some software ( Forth ) where i need to address RAM locations. I can see that the assembler allows labels for ROM locations, but how do we label RAM locations? Where data is trampolined from EPROM into RAM, how do we keep track of these by labels, and how to retrieve the labels? At the ...
by marcelk
12 Mar 2020, 22:28
Forum: Escape Meta Alt Control Shift
Topic: The Ultimate Acorn Archimedes talk
Replies: 1
Views: 2823

Re: The Ultimate Acorn Archimedes talk

Nice find! My cookies told me I already watched it, but I half forgot about this talk. Indeed there are similar lines of thought popping up in several places. And it is always a bit hard to see things that were avoided unless somebody points them out. For me the best is that, after watching again, p...
by marcelk
08 Mar 2020, 10:04
Forum: Escape Meta Alt Control Shift
Topic: SharmanCPU: a pipelined Von Neumann TTL CPU
Replies: 0
Views: 5985

SharmanCPU: a pipelined Von Neumann TTL CPU

Yesterday James Sharman posted this YouTube video where he demonstrates his TTL computer producing prime numbers. Video: https://www.youtube.com/watch?v=YxScH_ZQAZA Duration: 6m57s SharmanCPU.jpg To those who missed it, James has been working on his design for over a year. The whole design and build...
by marcelk
07 Mar 2020, 08:25
Forum: Hardware and software hacking
Topic: Fitting a screen inside the wooden box
Replies: 9
Views: 6148

Re: Fitting a screen inside the wooden box

25.2 cm x 17.6 cm x 3.0 cm
Those are the outside measures of the box. The PCB is 9.25 inch x 6.25 inch. Sorry for the imperial units, but I know those by heart...
by marcelk
26 Feb 2020, 07:15
Forum: Kit assembly gallery
Topic: Kit assembly by Ben Heck
Replies: 1
Views: 4541

Re: Kit assembly by Ben Heck

Ben posted a second video, demoing a (somewhat older) dev.rom!

Video https://www.youtube.com/watch?v=Dyd6L76A2Nw

Screenshot 2020-02-26 at 08.12.22.png
Screenshot 2020-02-26 at 08.12.22.png (620.64 KiB) Viewed 3840 times
by marcelk
21 Feb 2020, 20:46
Forum: Escape Meta Alt Control Shift
Topic: VCF East 2020
Replies: 0
Views: 6753

VCF East 2020

It runs from April 24-26 in InfoAge Science Center, Wall, New Jersey. http://vcfed.org/wp/festivals/vintage-computer-festival-east/ Info Age.jpg This VCF edition is 6502-themed: Two of the original 6502 designers will be present. The Monster6502 will be there. Ben Eater with his breadboard projects....
by marcelk
20 Feb 2020, 11:14
Forum: Kit assembly gallery
Topic: Read this if you need assistance building your Gigatron kit
Replies: 3
Views: 4359

Read this if you need assistance building your Gigatron kit

Just contact us by e-mail though the address listed in the assembly manual. In the unfortunate case that none of that helps, and if you would like assistance, the best next step is to contact us on the support e-mail address as listed in the assembly manual. In your mail, describe exactly what build...
by marcelk
18 Feb 2020, 11:34
Forum: Hardware and software hacking
Topic: Interrupts:
Replies: 11
Views: 8775

Re: Interrupts:

After experiencing the impact on Apple-1 Integer BASIC, I'm strongly thinking to move the $00FC-$00FF vIRQ locations to $0030-$0033. Any objections, please shoot...
by marcelk
17 Feb 2020, 23:03
Forum: Hardware and software hacking
Topic: associate the .gt1 filetype for web autoloading
Replies: 8
Views: 7226

Re: associate the .gt1 filetype for web autoloading

Don't take this wrong: As those surely are fine suggestions, mind that here we've come to expect the originator to take the lead on their own ideas and kickstart execution on them. This forum started as a show-and-tell place for a group of committed contributors, and we like to retain that spirit. A...
by marcelk
17 Feb 2020, 07:54
Forum: Hardware and software hacking
Topic: v6502 mini-assembler in Apple-1 emulator
Replies: 3
Views: 4714

Re: v6502 mini-assembler in Apple-1 emulator

With recent commits the `@'-cursor has returned. This time its blinking rate and duty cycle are derived from the original schematics. In the Apple-1 a 555 timer does the blinking with R1=R2=10k and C=25uF. The vIRQ handler uses those characteristics, and I verified the result against a video I took ...