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!
Message was sent through the cbm-hackers mailing list
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