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tek440x: update comments

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This commit is contained in:
Patrick Mackinlay 2024-03-18 17:10:11 +07:00
parent 6187f85536
commit b08674ed5c
1 changed files with 7 additions and 4 deletions
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11
src/mame/tektronix/tek_msu_fdc.cpp
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@ -5,10 +5,10 @@
* Tektronix 4404 Mass Storage Unit
*
* The MSU contains a 5 1/4" floppy drive, a 40MB hard disk and controllers
* which implement SASI/SCSI protocol to communicate with the host system. This
* device emulates represents the floppy disk portion, which consists of a 6502
* CPU, EPROM, RAM and a μPD765-compatible floppy drive controller chip. SASI
* signals are directly controlled by the CPU using discrete logic.
* which implement the SASI protocol to communicate with the host system. This
* device emulates the floppy disk portion, which consists of a 6502 CPU, EPROM,
* RAM and a μPD765-compatible floppy drive controller chip. SASI signals are
* directly controlled by the CPU using discrete logic.
*
* Sources:
* - 4404 Artificial Intelligence System, Component-Level Service Manual, Part No. 070-5610-01, Product Group 07, June 1987, Tektronix
@ -100,6 +100,9 @@ void tek_msu_fdc_device::device_add_mconfig(machine_config &config)
I8272A(config, m_fdc, 16_MHz_XTAL / 4, false);
m_fdc->intrq_wr_callback().set_inputline(m_cpu, INPUT_LINE_IRQ0);
// drive selection (US) outputs are decoded, inverted and fed back to the
// RDY input via a jumper block; units 0 and 1 are connected by default,
// even though the unit has only a single 5 1/4" drive fitted
m_fdc->us_wr_callback().set([this](u8 data) { m_fdc->ready_w(data > 1); });
FLOPPY_CONNECTOR(config, m_fdd, fdd_devices, "525dd", floppy_image_device::default_mfm_floppy_formats).enable_sound(true);