Atari 1040STF
 | |
| A 1040STF with SC1224 colour monitor and mouse | |
| Specifications | |
|---|---|
| Manufacturer | Atari Corporation |
| Type | Home computer |
| Released | Shown 9 January 1986 (Winter CES); on sale 1 March 1986 |
| Discontinued | 1989 |
| Intro price | US$999 with the SM124 monochrome monitor; US$1,199 with the SC1224 colour monitor (March 1986) |
| CPU | Motorola MC68000 at 8 MHz |
| Memory | 1 MB (32 × 256 kbit × 1 DRAM in two banks) |
| Storage | Internal 3.5-inch double-sided 720 KB drive; external drive on the 14-pin DIN; ACSI hard disks |
| Display | 320 × 200 (16 colours), 640 × 200 (4 colours), 640 × 400 monochrome; monitor only, no modulator |
| Sound | Yamaha YM2149 PSG, three channels |
| ROM | 192 KB TOS in six 32K × 8 ROMs |
| Power | Internal switching supply, +5 V and +12 V only, 2 A fuse |
| OS / Firmware | Atari TOS 1.00, 1.02 or 1.04 |
| Predecessor | Atari 520ST |
| Successor | Atari 1040STE |
The Atari 1040STF is the ST with 1 MB of RAM, an internal double-sided floppy drive and an internal power supply. Atari's service manual explains the name: "The 1040ST has a built in 1 Megabyte floppy disk drive, hence the full designation is 1040STF (floppy)."[1] It has no television modulator, so it needs a monitor: an SM124 for the monochrome mode or an SC1224 for colour. The version with a modulator is the Atari 1040STFM, and the features the two share are described at Atari 1040ST.
It was first shown at the Winter CES on 9 January 1986 and went on sale on 1 March 1986, alongside the 512 KB 520STF.[2] Production ended in 1989, when the STE arrived.[2] The German Atari museum describes it as the first computer sold with 1 MB of RAM as standard.[2]
In March 1986 the 1040STF cost US$999 with the monochrome SM124 and US$1,199 with the colour SC1224; both prices fell by US$100 in January 1987.[2]
Memory
[edit | edit source]RAM is 256 kbit × 1 DRAM. The 520 has one bank of 16 chips; the 1040 adds a second bank of 16, 32 in total. Atari's memory map gives 000800–07FFFF for the low bank and 080000–0FFFFF for the high bank.[1] The memory controller is programmed at power-up with the amount of RAM found, and Atari's hardware specification describes the per-bank sizing test the operating system uses for this.[3] A 1040STF that reports 512 KB therefore points at the second bank.
TOS is in six 32K × 8 ROMs, paired high and low at FC0000, FD0000 and FE0000. Some early 520STs had two 8K × 8 boot ROMs instead and loaded TOS from floppy.[1] The museum gives the ROM date of TOS 1.00 as 6 February 1986, before the 1040STF went on sale.[2]
Power supply
[edit | edit source]The internal switching supply provides +5 V and +12 V and nothing else: there is no −12 V output.[1] It is rated at 3 A at +5 V and 0.9 A at +12 V, with 33.5 W maximum input. It has a 2 A fuse and one adjustment, preset RV301 on Atari (Japan)'s drawing of the supply, which sets both rails together; Atari's instruction is to set the output within ±5 %, 4.75–5.25 V. Typical load is 2.2 A at +5 V and 160 mA at +12 V, rising to 2.3 A and 340 mA during disk access.[1] Atari adds that the supply has overcurrent protection, so a blown fuse usually means a catastrophic failure such as a shorted primary.[1]
The supply is mains-powered and its primary side holds a charge after it is unplugged. Discharge the primary reservoir before working on it.
Board revisions
[edit | edit source]The German Atari museum lists three main-board part numbers for the 1040STF, in production order. The 520STF uses the same boards with half the RAM fitted.[2]
- C070523: early production
- C070789: also used in the STFM models
- C103088: later production
Opening the case
[edit | edit source]Atari's disassembly sequence starts with seven screws in the square holes on the underside, which hold the top case to the bottom. If the board or the drive is to come out, also remove the three screws in the round holes, which hold the disk drive. The keyboard harness plugs in at the right front corner. The power supply can stay in place while the upper shield is lifted off for troubleshooting.[1]
Servicing
[edit | edit source]- Atari ST General Maintenance
- Atari ST Troubleshooting Guide
- Atari ST Capacitor Replacement Guide
- Atari 520ST and 1040ST Computer Field Service Manual: Atari's field service manual, January 1987
- Floppy Drive Repair
See also
[edit | edit source]References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Atari Corporation, 520ST / 1040ST Computer Field Service Manual, part number C026118-002 Rev B (3.6), January 1987: section 1 for the 1040STF designation and the internal power supply rating, fuse and adjustment; the Atari (Japan) drawing "Typical 1040STF(M) Power Supply", 30 September 1986 (PDF p. 62), for preset RV301; section 2 "Main Memory" for the 256 kbit × 1 DRAM organisation, the bank map and the ROM map; section 4 for the disassembly. Hosted on this wiki as File:Atari 520ST and 1040ST Computer Field Service Manual.pdf.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "Atari 1040ST", atari-computermuseum.de (in German). Secondary source for the first showing on 9 January 1986, sale from 1 March 1986, the 1989 end of production, the US monitor-bundle prices and their January 1987 reductions, the "first with 1 MB as standard" description, the TOS 1.00 ROM date, and the C070523, C070789 and C103088 board numbers.
- ↑ Atari Corporation, Engineering Hardware Specification of the Atari ST Computer System, 7 January 1986, section 2.2, Memory Configuration Register and the per-bank sizing test. Hosted on this wiki as Atari ST Engineering Hardware Specification (PDF).