Olivetti · PCS
Olivetti PCS 46/C
50 MHz i486DX2 PCS with ETEQ ET6000 and integrated Cirrus Logic GD5428 video.
History
PCS 46/C uses board BA2036, based on the T.1 BA2044 assembly, with ET6000, 83C206Q, PC87310 and GD5428. M4-46 belongs to the related design family but is a distinct commercial model, not an alias.
Hardware
- Processor
- Intel i486DX2/50
- Memory
- 4/8/12/20/36 MB
- Chipset
- ETEQ ET6000 + separate 83C206Q
- Board
- BA2036 based on T.1 BA2044
- Video
- Integrated Cirrus Logic CL-GD5428, 1 MB
- Floppy drive
- PC87310 integrated controller
Catalogue classification
- Form factor
- Desktop
- Mobility
- Stationary
- Processor generation
- i486 class
- Graphics standard
- VGA
- Storage interface
- Floppy drive, IDE
Research
This page separates documented hardware facts, behavior observed in original firmware, and the current fidelity of BluMach emulation.
Architecture and memory
Evidence: documentation, reverse engineering and diagnostics
- CPU and bus
Intel i486DX2/50 on the BA2036 board, derived from the T.1 BA2044 set. ETEQ ET6000 chipset with a separate 83C206Q for RTC, DMA, interrupts and timer.
- Memory
4 to 36 MB (4, 8, 12, 20 or 36 MB), according to the service manual chapter for the M4-4x, M4-6x and PCS4xx.
- Video
Integrated Cirrus Logic CL-GD5428 VGA with 1 MB. Its video BIOS is OVC 1.09.
- Storage
Floppy, serial and parallel in the PC87310, and an IDE interface on the board. The BIOS disk table is the same as the M300-30 one, with types 17 to 26 for IDE disks.
Emulation status
Evidence: current BluMach status; not necessarily a description of the original circuit
- ROM organization
One 128 KB image: the lower half supplies OVC 1.09 at C0000h and the upper half supplies Resident Diagnostics/System BIOS 1.05 at F0000h.
- Verified
POST, 4 MB detection, internal video, CMOS diagnostics, floppy/MS-DOS boot, a second NVR boot and Ctrl+Alt+Del have been observed.
- Pending or approximate
Bootable partial emulation: IDE, the other RAM populations and more software remain to be verified. Setup does not open from the keyboard; whether it runs from a utility disk remains to be established. The 83C206Q functions currently use the common AT core; this is neither a dedicated nor a cycle-exact model.
Sources
Sources and traceability
Evidence: primary sources and research notes