RE: A utility possibly of interest

ncoplin_at_orbeng.com
Date: 2004-06-10 08:03:11

Hi Jim,

I'd be interested in the tool, exe or BIN fine (just send as private email).
I wrote something like it for the XE1541 cable (IEC-CRO) available from my
website. As useful as the signal traces my seem, the problem is decoding
them into working routines. You are probably better off working from the C64
source code (or the 1541JD code). You'll find the sources here, and a
snippet below.

- Nick

http://hem.passagen.se/harlekin/download.htm

       beq $fb44
.fb4f  lda $b2	; lower three bits of $dd00
       stx $dd00	; store %00100xxx in $dd00
       bit $dd00	; bit test
       bvc $faf0	; branch is input clk=0
       nop	; timing
       sta $dd00	; store %00000xxx in $dd00
       ora $dd00	; read two first bits 
       lsr a	; move right two times
       lsr a
       nop	; timing
       ora $dd00	; read next two bits
       lsr a	; move right two times
       lsr a
       eor $b2	; "trixx" to handle the lower three bits of $dd00
       eor $dd00
       lsr a	; move right two times
       lsr a
       eor $b2	; "trixx" to handle the lower three bits of $dd00
       eor $dd00
       cpy $93	; load/verify flag
       bne $fb83	; branch if verify
       sta ($ae),y	; store loaded byte in memory


-----Original Message-----
From: owner-cbm-hackers@cling.gu.se
[mailto:owner-cbm-hackers@cling.gu.se]On Behalf Of Jim Brain
Sent: Tuesday, 25 May 2004 1:42 PM
To: CBM Hackers
Subject: A utility possibly of interest


Adrian provided me with great logic captures from his homebrew logic 
analyzer, but lamented the app to display them.  Since I need to pore 
over these to figure out JDos support, I wrote a utility to convert his 
raw data to Verilog VCD format.  If someone is interested in the C 
source (5kB), let me know.

The JDos TKSA command is shown in this screenshot of GTKWave, running on 
Linux:

http://www.jbrain.com/Screenshot-GTKWave.png

Jim

-- 
Jim Brain, Brain Innovations
brain@jbrain.com                                http://www.jbrain.com
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!


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