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Diffstat (limited to 'src/mame/drivers/notetaker.cpp')
-rw-r--r--src/mame/drivers/notetaker.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/drivers/notetaker.cpp b/src/mame/drivers/notetaker.cpp
index b38ce5777a9..2814b776818 100644
--- a/src/mame/drivers/notetaker.cpp
+++ b/src/mame/drivers/notetaker.cpp
@@ -934,7 +934,7 @@ ROM_START( notetakr )
ROM_REGION( 0x400, "kbmcu", ROMREGION_ERASEFF )
ROM_LOAD( "keyboard.i8748.a10a", 0x000, 0x400, NO_DUMP ) // keyboard mcu which handles key scanning as well as reading the mouse quadratures, and issues state responses if requested by the iocpu
ROM_REGION( 0x1000, "proms", ROMREGION_ERASEFF )
- ROM_LOAD( "disksep.prom.82s147.a4", 0x000, 0x200, NO_DUMP ) // disk data separator prom from the disk/display module board; there are two different versions of this prom, both generated by BCPL programs, one from 1978 (Single density only?) and one from 1979.
+ ROM_LOAD( "disksep.82s147.a4", 0x000, 0x200, CRC(38363714) SHA1(c995d2702573f5afb5fc919150d3a5661013f999) ) // disk data separator prom from the disk/display module board; there are two different versions of this prom, both generated by BCPL programs, one from 1978 (Single density only? seems very buggy and might not even work) and one from 1979 (which seems like it should work and appears here). Note that the bit order for the state counter (data bits 6,5,4,3) may be reversed vs the real machine, but since the prom address bus is the only thing that ever sees the prom data bus, this prom will work even if the bit order for those bits is backwards.
ROM_LOAD( "timingprom.82s147.b1", 0x200, 0x200, CRC(3003b50a) SHA1(77d9ffe4716c2297708b8e5ebce7f930619c3cc3) ) // memory cas/ras/write state machine prom from the memory address logic board; the contents of this are listed in http://www.bitsavers.org/pdf/xerox/notetaker/schematics/19781027_Memory_Address_Timing.pdf
ROM_LOAD( "memreqprom.82s126.d9", 0x400, 0x100, CRC(56b2be8b) SHA1(5df0579ed8afeb59113700be6f2982ef85f64b44) ) // SETMEMRQ memory timing prom from the disk/display module board; The equations for this one are actually listed on the schematic and the prom dump can be generated from these:
/*