dinapoli@rodan.acs.syr.edu (Ron DiNapoli) (02/16/90)
I am interested in reading a serial stream going at 230K bits/sec into my ST. I've been thinking of using the drive port (documentation says it moves at 250K bits/sec) but I am not sure it will work. I'd like to avoid using the internal expansion bus... any ideas? Ron DiNapoli
hyc@math.lsa.umich.edu (Howard Chu) (02/16/90)
In article <2099@rodan.acs.syr.edu> dinapoli@rodan.acs.syr.edu (Ron DiNapoli) writes: > >I am interested in reading a serial stream going at 230K bits/sec into >my ST. I've been thinking of using the drive port (documentation says >it moves at 250K bits/sec) but I am not sure it will work. I'd like to >avoid using the internal expansion bus... any ideas? > >Ron DiNapoli I don't think you'll be able to coerce the disk controller to give you the data at 230 instead of 250kbits/sec. Sounds a lot like Apple/Localtalk to me, why don't ya wait for Dave Small to finish his board... -- -- Howard Chu @ University of Michigan
km44+@andrew.cmu.edu (Kimble Charles Marshall) (02/16/90)
>Sounds a lot like Apple/Localtalk >to me, why don't ya wait for Dave Small to finish his board... Why wait, help him finish it up. I believe he said it still needs driver software. K.C. Marshall km44@Andrew.cmu.edu
DUJARDIN@FRESE51.BITNET (02/19/90)
In INFO-ATARI16 Digest V90 #211, Ron DiNapoli wrote : >I am interested in reading a serial stream going at 230K bits/sec into >my ST. I've been thinking of using the drive port (documentation says >it moves at 250K bits/sec) but I am not sure it will work. I'd like to >avoid using the internal expansion bus... any ideas? Why wouldn't we use the RS-232 port for such speeds ? I know that this port is usually used at baud rates <= 19200, but if you read the specs of the 68901, you see that it can be much faster : there's only a bit to change in a register, and things go 16 times faster. The trouble is that the documentation states that such speeds should only be used for synchronous communications, and i don't think it is available on the ST. There seems to be no way of adressing the RS-232 port with the DMA (!). Of course i did a few tests, and it seems to work allright. Maybe it caused some damage to my hardware (i didn't notice anything yet !), but 57600 bit/s works fine. I did the test between my ST and a PC (incidentally, RS 232 ports on PCs can work at 115200 bit/s - there's a file exchange program using this speed). You can set up this speed with Rsconf, and even use bios buffers ! The maximum speed is 614400 bit/s : not so bad, isn't it ?