The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘6502’ Category

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Level 29: The BBS

Posted by jpluimers on 2020/07/13

How retro can you get? [WayBack] Level 29: The BBS gets very far: it runs on an Apple IIgs and provides access via modem (via a landline!), telnet or web to the same text interface.

Web access via [WayBack] Shell In A Box

                                                                                                                                                                                    
Welcome to the *NEW* Level 29 BBS!                                                                                                                                                    
916 965 1701 - bbs.fozztexx.com                                                                                                                                                       
                                                                                                                                                                                      
 .             .   _,  _,                                                                                                                                                             
 |    _ .  , _ |  '_) (_)                                                                                                                                                             
 |___(/, \/ (/,|  /_.   |                                                                                                                                                             
                                                                                                                                                                                      
The official BBS of                                                                                                                                                                   
RetroBattlestations.com                                                                                                                                                               
                                                                                                                                                                                      
Enter your username or NEW or VISITOR                                                                                                                                                 
User:

It

Related:

Via: [WayBack] Got this TV yesterday at a garage sale and hooked up the Apple II through the Sup R Mod and installed the Hayes Micromodem IIe to call Level 29 BBS. No … – Chris Osborn – Google+

–jeroen

Posted in 6502, BBS, History | Leave a Comment »

Computing History – The UK Computer Museum – Cambridge

Posted by jpluimers on 2020/06/19

On my places to visit:

The Centre for Computing History is a computer museum based in Cambridge, UK. With a collection of vintage computers and game consoles, many of the exhibits are hands on and interactive.

[WayBack] Computing History – The UK Computer Museum – Cambridge.

When I bumped into it, this was their collection size, ranging from the 1960s until recent history:

Archive Statistics :

  • Computers = 993
  • Peripherals = 1446
  • Mobile Devices = 31
  • Game Consoles = 213
  • Video Games = 10259
  • Software Packages = 2605
  • Books = 2045
  • Manuals = 4106
  • Magazines = 9057

Looking at their archived brands (having [WayBack] MITS – Altair and [WayBack] Raspberry Pi in the collection) is such a joy.

Archiving the older parts is a tough job, as they stem from way before the web era, so information has been lost, parts are hard to source, a lot of hardware got thrown away or is hard to find at all, people have died. More on that at [WayBack] About – Computing History.

Without a physical visit, you can find what they have at [WayBack] Search Our Archive – Computing History.

The video below on their archive is impressive.

–jeroen

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Posted in 6502, 68k, Apple I, BBC Micro B, BBS, C64, Commodore, CP/M, dial-up modems, FidoNet, History, IBM SAA CUA, PowerPC, Tesseract, VIC-20, Z80 | Leave a Comment »

GitHub – dschmenk/apple2pi: Apple II client/server for Raspberry Pi

Posted by jpluimers on 2020/05/28

[WayBack] GitHub – dschmenk/apple2pi: Apple II client/server for Raspberry Pi: hybrid computer of a Raspberry Pi inside an Apple II (either ][, or ][+, or //e) so the Apple II can be a front-end to the Raspberry Pi which then can run an Apple IIGS emulator, talk to the Apple II storage hardware and much more.

It can run [WayBack] RASPPLE II: A2CLOUD, A2SERVER, Apple II Pi for Raspberry Pi

Lot’s of videos below, all by David Schmenk https://www.youtube.com/user/dschmenk/videos

Via:

–jeroen

 

 

Posted in *nix, *nix-tools, //e, 6502, Apple, Apple ][, Development, Hardware Development, Hardware Interfacing, History, Power User, Raspberry Pi, USB | Leave a Comment »

6502.org • Search: mos6502 G+ posts

Posted by jpluimers on 2020/05/15

With the demise of G+, I am glad that most of the [WayBack] mos6502 posts were archived at [WayBack] 6502.org • Search: mos6502 G+ posts

Via [WayBack] This week, OUP/M, a 6502 CP/M-ish operating system from 1983, in the process of recovery from Jian-Xiong Shao’s Masters Thesis into Github. And a reques… – mos6502 – Google+

[WayBack] mos6502 – Google+

6502 posts – new projects and interesting old projects from the archives

–jeroen

Posted in 6502, History | Leave a Comment »

Reminder to check out the Pascal source code for Apple’s legendary Lisa operating system

Posted by jpluimers on 2020/01/06

This is a reminder to check when the source code was actually released:

–jeroen

Posted in 6502, Apple, Classic Macintosh, History, Power User | Leave a Comment »

Applesauce – Make exact images of copy-protected Apple II floppy disks | Hacker News

Posted by jpluimers on 2019/07/08

I might want to try and buy one of these: [WayBack] Applesauce – Make exact images of copy-protected Apple II floppy disks | Hacker News.

A truckload of information is at [WayBack] Applesauce – The ReActiveMicro Apple II Wiki

It is still being updated: [WayBack] applesauce – Apple II Floppy Drive Controller

Via [WayBack] This week, in 6502-related hardware, the Applesauce: a Disk II imaging kit for your Apple II disks. Thanks to the minimal nature of Woz’ disk interface,… – mos6502 – Google+

Related: [WayBack] Confessions of a Disk Cracker: The Secrets of 4am | Hacker News

Videos below the fold…

–jeroen

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Posted in //e, 6502, Apple, History, Power User | Leave a Comment »

6502 emulation: the ICE, or in-circuit-emulator…

Posted by jpluimers on 2019/02/05

On my list of hardware things to try:

[WayBack] a different take on 6502 emulation: the ICE, or in-circuit-emulator… – mos6502 – Google+

Basically it consists of three parts:

 

–jeroen

 

Posted in 6502, Development, Hardware Development, History, Z80 | Leave a Comment »

A refefernce to 6502 by “Remember that in a stack trace, the addresses are return addresses, not call addresses – The Old New Thing”

Posted by jpluimers on 2018/09/11

On x86/x64/ARM/…:

It’s where the function is going to return to, not where it came from.

And:

Bonus chatter: This reminds me of a quirk of the 6502 processor: When it pushed the return address onto the stack, it actually pushed the return address minus one. This is an artifact of the way the 6502 is implemented, but it results in the nice feature that the stack trace gives you the line number of the call instruction.

Of course, this is all hypothetical, because 6502 debuggers didn’t have fancy features like stack traces or line numbers.

Source: [WayBack] Remember that in a stack trace, the addresses are return addresses, not call addresses – The Old New Thing

Which resulted in these comments at [WayBack] CC +mos6502 – Jeroen Wiert Pluimers – Google+:

  • mos6502: And don’t forget the crucial difference in PC on 6502 between RTS and RTI!
  • Jeroen Wiert Pluimers: +mos6502 I totally forgot about that one. Thanks for reminding me
    <<Note that unlike RTS, the return address on the stack is the actual address rather than the address-1.>>

References:

[WayBack] 6502.org: Tutorials and Aids – RTI

RTI retrieves the Processor Status Word (flags) and the Program Counter from the stack in that order (interrupts push the PC first and then the PSW).

Note that unlike RTS, the return address on the stack is the actual address rather than the address-1.

[WayBack] 6502.org: Tutorials and Aids – RTS

RTS pulls the top two bytes off the stack (low byte first) and transfers program control to that address+1. It is used, as expected, to exit a subroutine invoked via JSR which pushed the address-1.

RTS is frequently used to implement a jump table where addresses-1 are pushed onto the stack and accessed via RTS eg. to access the second of four routines.

–jeroen

Posted in 6502, 6502 Assembly, Assembly Language, Development, History, Software Development, The Old New Thing, Windows Development, x64, x86 | Leave a Comment »

Dennis1000/mos6502-delphi: A MOS 6502 CPU emulator written in Delphi (a very basic C64 + VIC20 emulator included)

Posted by jpluimers on 2018/06/25

Really cool history: [Archive.is] Dennis1000/mos6502-delphi: A MOS 6502 CPU emulator written in Delphi (a very basic C64 + VIC20 emulator included)

It should run on most 32-bit Delphi versions.

via:

–jeroen

Posted in 6502, C64, Commodore, Delphi, Development, History, Software Development, VIC-20 | 2 Comments »

Apple II Ethernet Module – a2RetroSystems

Posted by jpluimers on 2018/05/25

Reminder to self: see if I can order this:

Apple II Ethernet Module – This product is based on the Wiznet W5100 chip. It has an embedded hardware IP stack. Contiki, IP65, Marinetti and ADTPro have been updated to work with the new card.

We will be using Itead as our current PCB supplier.
The card will be assembled by Circuits Central

Source: [WayBack] Welcome to a2RetroSystems

Other links:

–jeroen

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Posted in //e, 6502, Apple, Apple ][, History, Power User | Leave a Comment »

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