From e56d38becaa64d6594fadc63a8b0f7af225f55fb Mon Sep 17 00:00:00 2001 From: Roberto Fresca Date: Thu, 6 Dec 2018 16:40:40 +0100 Subject: Break Thru (Tecfri license): Better notes explaining the implemented Bipolar PROM addressing. --- src/mame/drivers/brkthru.cpp | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/src/mame/drivers/brkthru.cpp b/src/mame/drivers/brkthru.cpp index 750d1ed5d43..4e0b11ed681 100644 --- a/src/mame/drivers/brkthru.cpp +++ b/src/mame/drivers/brkthru.cpp @@ -586,11 +586,13 @@ ROM_START( brkthrut ) ROM_LOAD( "11_de-0231-2_27156.h4", 0x08000, 0x8000, CRC(fd156945) SHA1(a0575a4164217e63317886176ab7e59d255fc771) ) // Same as parent ROM_LOAD( "12_de-0231-2_27156.h5", 0x10000, 0x8000, CRC(c152a99b) SHA1(f96133aa01219eda357b9e906bd9577dbfe359c0) ) // Same as parent - ROM_REGION( 0x0300, "proms", 0 ) // Truly dumped on the Tecfri PCB - /* The original 82s129 bipolar PROM for R/G was replaced with one 82s147 - that has twice the size, and apparently the A04 line disconnected... + ROM_REGION( 0x0300, "proms", 0 ) // Truly dumped on the Tecfri PCB. + /* + The original 82s129 bipolar PROM for R/G was replaced with one 82s147 + that has twice the size. Seems that A05 line was disconnected, and the + rest of bigger addressing lines were displaced covering the hole... */ - ROM_LOAD( "6309.c2", 0x0000, 0x0040, CRC(cd9709be) SHA1(1d9c451c771a7b38680e2179aa22289ea7cb2720) ) // Red and green component (82S147N) + ROM_LOAD( "6309.c2", 0x0000, 0x0040, CRC(cd9709be) SHA1(1d9c451c771a7b38680e2179aa22289ea7cb2720) ) // Red and Green component (82S147N) ROM_CONTINUE( 0x0020, 0x0040 ) ROM_CONTINUE( 0x0040, 0x0040 ) ROM_CONTINUE( 0x0060, 0x0040 ) -- cgit v1.2.3