Vintage Computer Library

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GridCase 1520

Links

(PDF) GRiDCase 1500 Series Hardware Technical Manual (October 1988)

(001500-50) Scanned by C. Singleton, OCR and Indexing by ClassicBits

(PDF) GRiDCase 1500 Series Hardware Service Course (May 1988)

(965018-00) Scanned by C. Singleton, OCR and Indexing by ClassicBits

(PDF) GRiDCase 1550sx Service Manual (June 1991)

(001500-60) Scanned by C. Singleton, OCR and Indexing by ClassicBits

GridCase 1520 Specifications

Brand NameGridSeriesGrid GridCase 1500 Series
ClassPortable, Laptop, Semi-RuggedDate10/26/1987
Price (MSRP)$3495.00 - $4695.00FCCID: F2J1520
Size2.3 x 15 x 11.5 (in)
5.8 x 38.1 x 29.2 (cm)
Weight12.5 lbs (5.7 kg)
CPU80C286 at 10 MhzRAM1 MB standard
8 MB max
8 x 30 pin SIPP sockets
Display
  • 10 in (25.4 cm) LCD
    640x400 resolution
    Monochrome, Supertwist, Blue/White
    CCFL backlight
    11:1 contrast ratio
  • 10 in (25.4 cm) Gas-Plasma
    640x400 resolution
    Monochrome, Orange
  • 9.4 in (23.9 cm) Gas-Plasma
    640x200 resolution
    Monochrome, Orange
    20:1 contrast ratio (low power)
  • 10 in (25.4 cm) LCD
    640x400 resolution
    Monochrome, Transmissive, Supertwist, Blue/White
    CCFL backlight
    12:1 contrast ratio
Video
  • CGA, AT&T-6300
  • VGA

Internal VGA on some models only.
Mass Storage 3.5" IDE HDD
3.5" JVC HDD
20,40,100 MB Capacity
Removable Storage3.5 1.44
BIOS ROMPhoenix 32 KB EPROM
2 x 27C128 DIP-28
Application ROM256 KB (total) EPROM
2 DIP-32 socket(s)
Some docs say 512k total, No AppRom on VGA models
Keyboard72 keysExternal Ports1-DB9SERIAL, 1-PARALLEL, AT-KEYBOARD, RGB or VGA-VIDEO, Ext. FDD-OTHER1, RJ11/Phone-OTHER2
Power Req.Input 9 - 18 Volts
Barrel Plug connector
PSU model 34170 60W 16.25V 3.7A
Battery32111 16.25V 3.7Ah NiCad
Operating SystemGRID MS-DOS 3.3System SoftwareCONF1520.EXE, DEVICES.EXE, EMM.SYS, GRIDSCAN.EXE
NOTES:
  • GridCase 1520 code name: Python
Specifications listed may be incomplete, incorrect, or vary by exact model.
A note about GridCase 1500 series ROM capacity...

ClassicBits

GridCase 1500 series computers have two Application ROM sockets which can accept 28 and 32-pin chips in sizes from 32KB to 128KB each (256KB maximum total). Models with VGA graphics do not support ROM. Also, the GRiD ROM Subsystem is only supported by specific versions of GRiD MS-DOS.

Some GRiDCase owners manuals and sales brochures incorrectly state 512KB capacity. The correct total should be 256KB (Two 128KB EPROMs, as stated in the hardware reference manual). This limit is because ROMs are bank switched into the display memory area (A0000h-B8FFFh) which is 128KB in size.
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