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SDS: Fix intermittent I/O data errors when two or more I/O channels active

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When reading from paper tape on the W channel and writing the drum on the E channel, intermittent errors and premature end-of-record were observed. The TST_XFR macro was failing to properly quality that a data character was available for a particular device and channel. Thus, a data ready condition for the drum would cause a bad transfer for another active device on a different channel.
This commit is contained in:
Mark Emmer 2015-01-19 19:29:28 -06:00
parent 4fbf8f36db
commit 7dfc409da3
1 changed files with 1 additions and 1 deletions
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SDS/sds_io.c
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@ -55,7 +55,7 @@
#define I_GETDEV3(x) ((((x) & 020046000) != 020046000)? ((x) & DEV_MASK): DEV_MASK)
#define TST_XFR(d,c) (xfr_req && dev_map[d][c])
#define TST_XFR(d,c) (xfr_req & dev_map[d][c])
#define SET_XFR(d,c) xfr_req = xfr_req | dev_map[d][c]
#define CLR_XFR(d,c) xfr_req = xfr_req & ~dev_map[d][c]
#define INV_DEV(d,c) (dev_dsp[d][c] == NULL)