diff options
author | 2010-08-26 03:27:52 +0000 | |
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committer | 2010-08-26 03:27:52 +0000 | |
commit | dc3a3e86b4a7106799eac54c2321c5951beb60e0 (patch) | |
tree | 0b61b331fa183ff5b8043526499ccbe54f66cb48 /src/emu/machine | |
parent | acddc6272024234e3107c9e2688d5839453e9c11 (diff) |
Corrected some comments in 6821pia.h, no whatsnew
Diffstat (limited to 'src/emu/machine')
-rw-r--r-- | src/emu/machine/6821pia.h | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/src/emu/machine/6821pia.h b/src/emu/machine/6821pia.h index 661f8b6f75f..0f05acd72ed 100644 --- a/src/emu/machine/6821pia.h +++ b/src/emu/machine/6821pia.h @@ -3,18 +3,17 @@ Motorola 6821 PIA interface and emulation Notes: - * pia6821_get_port_b_z_mask() gives the caller the bitmask - that show which bits are high-impendance when - reading port B, thus neither 0 or 1. - pia6821_get_output_cb2_z() returns the same - information for the CB2 pin - * pia6821_set_port_a_z_mask allows the input callback to - indicate which port A bits are disconnected. - For these bit, the read operation will return the - output buffer's contents - * the 'alt' interface functions are used when the A0 and A1 - address bits are swapped - * all 'int' data or return values are Boolean + * get_port_b_z_mask() gives the caller the bitmask that shows + which bits are high-impendance when reading port B, and thus + neither 0 or 1. get_output_cb2_z() returns the same info + for the CB2 pin. + * set_port_a_z_mask allows the input callback to indicate + which port A bits are disconnected. For these bits, the + read operation will return the output buffer's contents. + * The 'alt' interface functions are used when the A0 and A1 + address bits are swapped. + * All 'int' data or return values are bool, and should be + converted to bool at some point. **********************************************************************/ |