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author hap <happppp@users.noreply.github.com>2021-11-30 14:30:27 +0100
committer hap <happppp@users.noreply.github.com>2021-11-30 14:30:43 +0100
commitcdce54aabf94851fb1882effee7b408093f05e42 (patch)
tree788604b29db0eb06c1236b7f3487387d63a9fd52 /src
parentc2a18887b0d68ff88d631801d2e5d5448508e2cb (diff)
saitek_osa/sparc: add note about expanded ram
Diffstat (limited to 'src')
-rw-r--r--src/devices/bus/saitek_osa/sparc.cpp5
-rw-r--r--src/mame/drivers/im01.cpp6
2 files changed, 8 insertions, 3 deletions
diff --git a/src/devices/bus/saitek_osa/sparc.cpp b/src/devices/bus/saitek_osa/sparc.cpp
index 636c3387ca8..b8bcc6f4e32 100644
--- a/src/devices/bus/saitek_osa/sparc.cpp
+++ b/src/devices/bus/saitek_osa/sparc.cpp
@@ -15,6 +15,11 @@ Hardware notes:
The module doesn't have its own LCD screen. It has a grill+fan underneath
at the front part, and a heatsink on the CPU.
+About expanded RAM: The 4MB expansion mentioned in the manual works well,
+but it doesn't look like the software was designed to work with other options.
+At 2MB it doesn't work at all. At 8MB or 16MB it becomes very inefficient,
+only using 5MB or 9MB of the available RAM for hash tables.
+
TODO:
- runs too slow? solving mate problems is around 60% slower than real device,
maybe cpu cache related?
diff --git a/src/mame/drivers/im01.cpp b/src/mame/drivers/im01.cpp
index 7484f0aee23..32ab3176e29 100644
--- a/src/mame/drivers/im01.cpp
+++ b/src/mame/drivers/im01.cpp
@@ -156,7 +156,7 @@ u16 im01_state::mux_r(offs_t offset, u16 mem_mask)
void im01_state::mux_w(offs_t offset, u16 data, u16 mem_mask)
{
- // d0-d5: input mux
+ // d0-d5: input mux, digit select
COMBINE_DATA(&m_inp_mux);
update_display();
@@ -171,7 +171,7 @@ u16 im01_state::digit_r(offs_t offset, u16 mem_mask)
void im01_state::digit_w(offs_t offset, u16 data, u16 mem_mask)
{
- // d0-d7: digit segment data
+ // d1-d7: digit segment data
COMBINE_DATA(&m_digit_data);
update_display();
}
@@ -263,7 +263,7 @@ void im01_state::im01(machine_config &config)
m_maincpu->set_periodic_int(FUNC(im01_state::interrupt), attotime::from_hz(177));
// video hardware
- PWM_DISPLAY(config, m_display).set_size(5, 8);
+ PWM_DISPLAY(config, m_display).set_size(5, 7);
m_display->set_segmask(0x1f, 0x7f);
config.set_default_layout(layout_im01);