diff options
| author |   Roberto Fresca <robbie@robertofresca.com> | 2018-12-06 16:40:40 +0100 |
|---|---|---|
| committer | Roberto Fresca <robbie@robertofresca.com> | 2018-12-06 16:40:40 +0100 |
| commit | e56d38becaa64d6594fadc63a8b0f7af225f55fb (patch) | |
| tree | bc5f21cffef24d044d7e8b10e9c95599e9771c15 | |
| parent | cb145e8e438bc5178863b09e84acfa3b0b42daff (diff) | |
Break Thru (Tecfri license): Better notes explaining
the implemented Bipolar PROM addressing.
| -rw-r--r-- | src/mame/drivers/brkthru.cpp | 10 |
1 files 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 ) |