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Re: Cassette interface

Vince:

When do you expect the kits to be shipping out?
by tranter
Aug Mon 20, 2012 7:00 pm
 
Forum: replica 1 General Discussion
Topic: Cassette interface
Replies: 23
Views: 57963

Re: Expansion storage board

> Just needed some help, > Where the n/c ( pin 1 ) on the EEPROM chip connect to? It does not need to be connected to anything. > on the 74LS00, where do i get the phi2 ( i assume its the 5mhz one on the replica one ) connection from? It comes from pin "A" on the expansion slot. > Are the ...
by tranter
Aug Mon 20, 2012 6:57 pm
 
Forum: Creation Room
Topic: Expansion storage board
Replies: 12
Views: 28600

Re: Expansion storage board

Basically, yes.

The board I built supports 2 8K EEPROM. EPROM, or RAM chips. See https://github.com/jefftranter/6502/tre ... emoryBoard

That ATMEL EEPROM should work. I had success with ATMEL devices. I had problems with a XICOR chip.
by tranter
Aug Fri 17, 2012 8:04 am
 
Forum: Creation Room
Topic: Expansion storage board
Replies: 12
Views: 28600

Re: Expansion storage board

The software could be as simple as some code (even in BASIC) to copy from the Replica 1's RAM to the EEPROM. You could get fancier if you wanted to implement some kind of file system. You might be interested in this design too: http://school.anhb.uwa.edu.au/personalpages/kwessen/apple1/extensions/ex...
by tranter
Aug Thu 16, 2012 7:30 am
 
Forum: Creation Room
Topic: Expansion storage board
Replies: 12
Views: 28600

Re: Expansion storage board

By "expansion" what did you have in mind - EEPROM. flash memory, cassette tape? There's a simple RAM/EEPROM circuit documented here http://www.brielcomputers.com/eeprom.pdf . I built a 16K memory board based on that circuit but it doesn't provide a lot of storage. The CFFA1 is a 16MB flash...
by tranter
Aug Wed 15, 2012 9:34 pm
 
Forum: Creation Room
Topic: Expansion storage board
Replies: 12
Views: 28600

Replica 1 Quick Reference

I made a four page quick reference that lists a memory map, useful addresses, and commands for the Replica 1 and expansion cards.
It can be found at https://github.com/jefftranter/6502/blob/master/docs/Replica1QuickReference.pdf. I hope you find it useful.
by tranter
Aug Sun 12, 2012 10:05 am
 
Forum: replica 1 General Discussion
Topic: Replica 1 Quick Reference
Replies: 0
Views: 6588

Re: IMSAI

Very interesting. I had no idea IMSAI was still alive but I see there is a web site at http://www.imsai.net/ including some info on The IMSAI Series Two Project. That could be a good fit with the other replica kits you offer. I hope it can be offered at least in part as a kit as well as fully assemb...
by tranter
Jul Tue 31, 2012 6:03 pm
 
Forum: Venues, projects and off topic stuff - NO SPAM
Topic: IMSAI
Replies: 21
Views: 60543

Re: Cassette interface

Vince: I see the design has the change to the input capacitor from .01 to .1 uF that Mike Willegal found improved reliability. He also found that using a 7474 rather than 74LS74 improved the performance, so you might also want to make that change. And don't forget that R1 through R4 should be 1% tol...
by tranter
Jul Sun 22, 2012 2:24 pm
 
Forum: replica 1 General Discussion
Topic: Cassette interface
Replies: 23
Views: 57963

Re: Video comparison of the Apple-1 and Replica-1

Nice video. I consider the support for lowercase display on the Replica 1 a feature rather than a bug. It would be a simple change to the Propeller code to only support uppercase, and one of the great things about the Replica 1 is that all the source code is there, the Propeller development tools ar...
by tranter
Jul Sun 15, 2012 6:59 pm
 
Forum: replica 1 General Discussion
Topic: Video comparison of the Apple-1 and Replica-1
Replies: 3
Views: 13398

Re: Cassette interface

Hi Vince:

Any update on whether a run of the boards will be happening?
by tranter
Jul Thu 05, 2012 10:03 pm
 
Forum: replica 1 General Discussion
Topic: Cassette interface
Replies: 23
Views: 57963

Re: What to get

All you need in addition to the kit is a 7-9 VDC power supply or ATX power supply. PS/2 keyboard, TV or monitor that accepts composite video, and a video cable. There is a lot of software on the CD-ROM to get you started. After that you can do whatever interests you, BASIC games, machine language pr...
by tranter
May Wed 30, 2012 5:18 pm
 
Forum: replica 1 General Discussion
Topic: What to get
Replies: 3
Views: 13281

2KSA - A 2K Symbolic Assembler for the 6502

I posted this to the Replica 1 forum but it may be of interest to Micro-KIM users too:
viewtopic.php?t=1070
by tranter
Apr Sat 28, 2012 8:02 pm
 
Forum: Software
Topic: 2KSA - A 2K Symbolic Assembler for the 6502
Replies: 0
Views: 5402

2KSA - A 2K Symbolic Assembler for the 6502

2KSA is a symbolic assembler written in 1979 by Robert Denison. It was primarily written for KIM-1 systems. It is a somewhat primitive assembler by today's standards but it only 2 kilobytes in size, allowing it to run resident on very small systems like the original KIM-1. It is also well documented...
by tranter
Apr Sat 28, 2012 8:00 pm
 
Forum: Software
Topic: 2KSA - A 2K Symbolic Assembler for the 6502
Replies: 0
Views: 7159

Re: Applesoft Lite - Why no trig functions?

Since I posted this, I ported this version of BASIC to the Replica 1, at least the OSI version of it.
For details, see http://jefftranter.blogspot.ca/2012/04/microsoft-basic-for-replica-1.html
by tranter
Apr Fri 27, 2012 7:13 am
 
Forum: replica 1 General Discussion
Topic: Applesoft Lite - Why no trig functions?
Replies: 4
Views: 13080

Re: More recent CC65 patches?

An update: Jeremy Rand sent me patches for 2.12.0 and I adapted them to work with the latest 2.13.3 release of cc65 including the C compiler.
They are available at https://github.com/jefftranter/6502/tree/master/asm/cc65
by tranter
Apr Sat 21, 2012 7:17 pm
 
Forum: Software
Topic: More recent CC65 patches?
Replies: 1
Views: 7172
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